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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2017	Feb. 20, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	IBP
Entity Registrant Name	INSTALLED BUILDING PRODUCTS, INC.
Entity Central Index Key	0001580905
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		31,862,080
Entity Public Float			$ 1,150,753,666

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 62,510	$ 14,482
Investments	30,053
Accounts receivable (less allowance for doubtful accounts of $4,805 and $3,397 at December 31, 2017 and 2016, respectively)	180,725	128,466
Inventories	48,346	40,229
Other current assets	33,308	9,214
Total current assets	354,942	192,391
Property and equipment, net	81,075	67,788
Non-current assets
Goodwill	155,466	107,086
Intangibles, net	137,991	86,317
Other non-current assets	9,272	8,513
Total non-current assets	302,729	201,916
Total assets	738,746	462,095
Current liabilities
Current maturities of long-term debt	16,650	17,192
Current maturities of capital lease obligations	5,666	6,929
Accounts payable	87,425	67,921
Accrued compensation	25,399	18,212
Other current liabilities	24,666	19,851
Total current liabilities	159,806	130,105
Long-term debt	330,927	134,235
Capital lease obligations, less current maturities	6,479	8,364
Deferred income taxes	6,444	14,239
Other long-term liabilities	24,562	21,175
Total liabilities	528,218	308,118
Commitments and contingencies (Note 14)
Stockholders' equity
Preferred Stock; $0.01 par value: 5,000,000 authorized and 0 shares issued and outstanding at December 31, 2017 and 2016, respectively
Common Stock; $0.01 par value: 100,000,000 authorized, 32,524,934 and 32,135,176 issued and 31,862,146 and 31,484,774 shares outstanding at December 31, 2017 and 2016, respectively (Note 10)	325	321
Additional paid in capital	174,043	158,581
Retained earnings	48,434	7,294
Treasury Stock; at cost: 662,788 and 650,402 shares at December 31, 2017 and 2016, respectively	(12,781)	(12,219)
Accumulated other comprehensive income	507
Total stockholders' equity	210,528	153,977
Total liabilities and stockholders' equity	$ 738,746	$ 462,095

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4,805	$ 3,397
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	32,524,934	32,135,176
Common stock, shares outstanding	31,862,146	31,484,774
Treasury Stock	662,788	650,402

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net revenue	$ 1,132,927	$ 862,980	$ 662,719
Cost of sales	808,901	610,532	474,426
Gross profit	324,026	252,448	188,293
Operating expenses
Selling	58,450	49,667	37,702
Administrative	164,453	125,472	99,375
Amortization	26,857	11,259	6,264
Operating income	74,266	66,050	44,952
Other expense (income)
Interest expense, net	17,381	6,177	3,738
Other	1,065	263	(716)
Income before income taxes	55,820	59,610	41,930
Income tax provision	14,680	21,174	15,413
Net income	41,140	38,436	26,517
Other comprehensive income, net of tax:
Unrealized gain on cash flow hedge, net of tax provision of $206, $0 and $0 for the twelve months ended December 31, 2017, 2016 and 2015, respectively	507
Comprehensive income	$ 41,647	$ 38,436	$ 26,517
Basic and diluted net income per share	$ 1.30	$ 1.23	$ 0.85
Weighted average shares outstanding:
Basic	31,639,283	31,301,887	31,298,163
Diluted	31,756,363	31,363,290	31,334,569

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Unrealized gain (loss) on cash flow hedge, tax (provision) benefit	$ 206	$ 0	$ 0

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Accumulated Deficit / Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]
BALANCE at Dec. 31, 2014	$ 91,874	$ 319	$ 154,497	$ (57,659)	$ (5,283)
BALANCE, Shares at Dec. 31, 2014		31,839,087
BALANCE, Treasury Shares at Dec. 31, 2014					(300,000)
Net income	26,517			26,517
Issuance of Common Stock Awards to Employees, Value		$ 1	(1)
Issuance of Common Stock Awards to Employees, Shares		130,613
Surrender of Common Stock Awards by Employees, Shares					(1,560)
Share-Based Compensation Expense	1,816		1,816
Share-Based Compensation issued to Directors, Value	300		300
Share-Based Compensation issued to Directors, Shares		13,188
Tax Benefit from Stock Plan	76		76
Common Stock Repurchase,Value	(6,100)				$ (6,100)
Common Stock Repurchase , Shares					(315,000,000)
BALANCE at Dec. 31, 2015	114,483	$ 320	156,688	(31,142)	$ (11,383)
BALANCE, Shares at Dec. 31, 2015		31,982,888
BALANCE, Treasury Shares at Dec. 31, 2015					(616,560)
Net income	38,436			38,436
Issuance of Common Stock Awards to Employees, Value		$ 1	(1)
Issuance of Common Stock Awards to Employees, Shares		143,528
Surrender of Common Stock Awards by Employees, Value	(836)				$ (836)
Surrender of Common Stock Awards by Employees, Shares					(33,842)
Share-Based Compensation Expense	1,594		1,594
Share-Based Compensation issued to Directors, Value	300		300
Share-Based Compensation issued to Directors, Shares		8,760
BALANCE at Dec. 31, 2016	$ 153,977	$ 321	158,581	7,294	$ (12,219)
BALANCE, Shares at Dec. 31, 2016	32,135,176	32,135,176
BALANCE, Treasury Shares at Dec. 31, 2016	(650,402)				(650,402)
Net income	$ 41,140			41,140
Purchase of Remaining Interest in Subsidiary	(1,888)		(1,888)
Issuance of Common Stock for Acquisition, Value	10,859	$ 3	10,856
Issuance of Common Stock for Acquisition, Shares		282,577
Issuance of Common Stock Awards to Employees, Value		$ 1	(1)
Issuance of Common Stock Awards to Employees, Shares		101,241
Surrender of Common Stock Awards by Employees, Value	(562)				$ (562)
Surrender of Common Stock Awards by Employees, Shares					(12,386)
Share-Based Compensation Expense	6,195		6,195
Share-Based Compensation issued to Directors, Value	300		300
Share-Based Compensation issued to Directors, Shares		5,940
Other Comprehensive Income, Net of Tax	507					$ 507
BALANCE at Dec. 31, 2017	$ 210,528	$ 325	$ 174,043	$ 48,434	$ (12,781)	$ 507
BALANCE, Shares at Dec. 31, 2017	32,524,934	32,524,934
BALANCE, Treasury Shares at Dec. 31, 2017	(662,788)				(662,788)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 41,140	$ 38,436	$ 26,517
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization of property and equipment	28,285	23,571	16,975
Amortization of intangibles	26,857	11,259	6,264
Amortization of deferred financing costs and debt discount	1,093	383	264
Provision for doubtful accounts	2,834	2,928	919
Write-off of debt issuance costs	2,113	286
Gain on sale of property and equipment	(492)	(254)	(409)
Gain on bargain purchase			(1,116)
Noncash stock compensation	6,592	1,894	2,116
Deferred income taxes	(6,160)	(605)	(1,515)
Changes in assets and liabilities, excluding effects of acquisitions
Accounts receivable	(19,955)	(18,760)	(17,526)
Inventories	(3,667)	(8,677)	(2,846)
Other assets	(4,602)	2,803	823
Accounts payable	6,303	12,400	(2,511)
Income taxes payable/receivable	(18,605)	1,484	3,592
Other liabilities	7,036	6,118	3,000
Net cash provided by operating activities	68,772	73,266	34,547
Cash flows from investing activities
Purchases of investments	(30,194)
Purchases of property and equipment	(31,668)	(27,013)	(27,305)
Acquisitions of businesses, net of cash acquired of $247, $2,181 and $926 in 2017, 2016 and 2015, respectively	(137,120)	(53,312)	(84,274)
Proceeds from sale of property and equipment	959	691	634
Other	(2,420)	37	(420)
Net cash used in investing activities	(200,443)	(79,597)	(111,365)
Cash flows from financing activities
Proceeds from revolving line of credit under credit agreement applicable to respective period (Note 6)		37,975	149,350
Payments on revolving line of credit under credit agreement applicable to respective period (Note 6)		(37,975)	(149,350)
Proceeds from term loan under credit agreement applicable to respective period (Note 6)	300,000	100,000	50,000
Payments on term loan under credit agreement applicable to respective period (Note 6)	(97,750)	(51,875)	(24,688)
Proceeds from delayed draw term loan under credit agreement applicable to respective period (Note 6)	112,500	12,500	50,000
Payments on delayed draw term loan under credit agreement applicable to respective period (Note 6)	(125,000)	(50,000)
Proceeds from vehicle and equipment notes payable	22,460	22,948	21,334
Debt issuance costs	(8,281)	(1,238)	(758)
Principal payments on long-term debt	(10,002)	(5,849)	(4,088)
Principal payments on capital lease obligations	(7,314)	(8,598)	(9,674)
Acquisition-related obligations	(4,464)	(3,057)	(3,151)
Repurchase of common stock			(6,100)
Surrender of common stock awards by employees	(562)	(836)
Purchase of remaining interest in subsidiary	(1,888)
Net cash provided by financing activities	179,699	13,995	72,875
Net change in cash and cash equivalents	48,028	7,664	(3,943)
Cash and cash equivalents at beginning of year	14,482	6,818	10,761
Cash and cash equivalents at end of year	62,510	14,482	6,818
Supplemental disclosures of cash flow information Net cash paid during the year for:
Interest	13,758	5,342	3,287
Income taxes, net of refunds	38,887	18,929	13,493
Supplemental disclosure of noncash investing and financing activities
Common stock issued for acquisition of business	10,859
Vehicles capitalized under capital leases and related lease obligations	4,440	3,737	3,379
Seller obligations in connection with acquisition of businesses	5,128	4,459	13,180
Unpaid purchases of property and equipment included in accounts payable	$ 2,003	$ 775	$ 220

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
Cash acquired, Net	$ 247	$ 2,181	$ 926

Organization

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

NOTE 1 – ORGANIZATION

Installed Building Products, Inc. (“IBP”), a Delaware corporation formed on October 28, 2011, and its wholly-owned subsidiaries (collectively referred to as the “Company” and “we,” “us” and “our”) primarily install insulation, waterproofing, fire-stopping, fireproofing, garage doors, rain gutters, shower doors, closet shelving and mirrors and other products for residential and commercial builders located in the continental United States. The Company operates in over 125 locations and its corporate office is located in Columbus, Ohio.

We have one operating segment and a single reportable segment. We offer our portfolio of services for new and existing single-family and multi-family residential and commercial building projects from our national network of branch locations. Commercial sales have increased primarily due to the acquisition of Trilok Industries, Inc., Alpha Insulation and Waterproofing Inc. and Alpha Insulation and Waterproofing Company (collectively, “Alpha”).

Each of our branches has the capacity to serve all of our end markets. For the years ended December 31, 2017, 2016 and 2015, residential new construction and repair and remodel was 83%, 88% and 89% of our net revenue and commercial construction was 17%, 12% and 11% of our net revenue, respectively. The following table sets forth the percentage of our net revenue by product category:


	Years ended December 31,
	2017			2016			2015
Insulation		67	%		77	%		78	%
Waterproofing		8			2			2
Shower doors, shelving and mirrors		7			5			5
Garage doors		5			6			6
Rain gutters		4			4			5
Other building products		9			6			4

		100	%		100	%		100	%

Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Significant Accounting Policies

NOTE 2 – SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation and Principles of Consolidation

We prepare our consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The accompanying consolidated financial statements include all of our wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated.

Use of Estimates

Preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates include the revenue, costs and reserves established under the percentage-of-completion method, allowance for doubtful accounts, valuation allowance on deferred tax assets, valuation of the reporting unit, valuation of acquired intangible assets, impairment of intangible assets and other long-lived assets, share-based compensation, reserves for general liability and workers’ compensation and medical insurance. Management believes the accounting estimates are appropriate and reasonably determined; however, due to the inherent uncertainties in making these estimates, actual amounts could differ from such estimates.

Cash and Cash Equivalents

We consider all highly-liquid investments purchased with original term to maturity of three months or less to be cash equivalents. We had $55.6 million of cash equivalents as of December 31, 2017 and zero cash equivalents as of December 31, 2016. Substantially all cash is held in banks providing FDIC coverage of $0.25 million per depositor.

Revenue and Cost Recognition

Revenue from the sale and installation of products is recognized when all of the following have occurred: (i) persuasive evidence of an arrangement exists; (ii) delivery has occurred or services have been rendered; (iii) the price is fixed or determinable; and (iv) the ability to collect is reasonably assured. We recognize revenue using either the completed contract method or the percentage-of-completion method of accounting, depending primarily on length of time required to complete the contract. The completed contract method is used for short-term contracts for which financial position and results of operations reported on the completed-contract basis would not vary materially from those resulting from use of the percentage-of-completion method. Revenue from the sale and installation of products is recognized net of adjustments and discounts and, for revenue using the completed contract method of accounting, at the time the installation is complete. When the percentage-of-completion method is used, we estimate the costs to complete individual contracts and record as revenue that portion of the total contract price that is considered complete based on the relationship of costs incurred to date to total anticipated costs (the cost-to-cost approach). The costs of earned revenue include all direct material and labor costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools and repairs. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined.

Accounting Policy for Derivative Instruments and Hedging Activities

We record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the earnings effect of the hedged forecasted transactions in a cash flow hedge. We may enter into derivative contracts that are intended to economically hedge certain of our risks, even though hedge accounting does not apply or we elect not to apply hedge accounting.

Investment Policy

Marketable securities with original maturities longer than three months but less than one year from the balance sheet date are classified as investments within current assets. These investments consist of highly liquid investment grade instruments primarily including corporate bonds and commercial paper. Investments for which we have the ability and positive intent to hold to maturity are carried at amortized cost. The difference between the acquisition costs and face values of held-to-maturity investments is amortized over the remaining term of the investments and added to or subtracted from the acquisition cost and interest income. As of December 31, 2017, all of our investments were classified as held-to-maturity.

Business Combinations

The purchase price for business combinations is allocated to the estimated fair values of acquired tangible and intangible assets, including goodwill and assumed liabilities, where applicable. Additionally, we recognize customer relationships, trademarks and trade names, backlog and non-competition agreements as identifiable intangible assets. These assets are recorded at fair value as of the transaction date. The fair value of these intangibles is determined primarily using the income approach and using current industry information which involves significant unobservable inputs (Level 3 inputs). These inputs include projected sales, margin and tax rate.

At times, the total purchase price for a business combination could be less than the estimated fair values of acquired tangible and intangible assets. In these cases, we record a gain on bargain purchase within other expenses in the Consolidated Statements of Operations and Comprehensive Income rather than goodwill in accordance with U.S. GAAP.

Accounts Receivable

We account for trade receivables based on amounts billed to customers. Past due receivables are determined based on contractual terms. We do not accrue interest on any of our trade receivables.

Retainage receivables represent the amount retained by our customers to ensure the quality of the installation and is received after satisfactory completion of each installation project. Management regularly reviews aging of retainage receivables and changes in payment trends and records an allowance when collection of amounts due are considered at risk. Amounts retained by project owners under construction contracts and included in accounts receivable were $23.1 million and $10.3 million as of December 31, 2017 and 2016, respectively. As of December 31, 2017, all but $0.5 million of retainage receivables, which are recorded in other long-term assets, were estimated to be contractually due within one year.

Allowance for Doubtful Accounts

We maintain an allowance for doubtful accounts for estimated losses resulting from the failure of customers to make required payments. The allowance is determined by management based on our historical losses, specific customer circumstances and general economic conditions. We analyze aged accounts receivable and generally increase the allowance as receivables age. Management reviews accounts receivable and records an allowance for specific customers based on current circumstances and charges off the receivable against the allowance when all attempts to collect the receivable have failed. This analysis is performed regularly and the allowance is adjusted accordingly. The following table sets forth our allowance for doubtful accounts (in thousands):


Allowance for doubtful accounts receivable
January 1, 2015	$	2,661
Charged to costs and expenses		919
Charged to other accounts (1)		533
Deductions (2)		(1,627	)

December 31, 2015	$	2,486

Charged to costs and expenses		2,928
Charged to other accounts (1)		435
Deductions (2)		(2,452	)

December 31, 2016	$	3,397

Charged to costs and expenses		2,834
Charged to other accounts (1)		699
Deductions (2)		(2,125	)

December 31, 2017	$	4,805

(1)	Recovery of receivables previously written off as bad debt and other

(2)	Write-off of uncollectible accounts receivable

Concentration of Credit Risk

Credit risk is our risk of financial loss from the non-performance of a contractual obligation on the part of our counterparty. Such risk arises principally from our receivables from customers and cash and bank balances. Substantially all of our trade accounts receivable are from entities engaged in residential and commercial construction. We perform periodic credit evaluations of our customers’ financial condition. The general credit risk of our counterparties is not considered to be significant. In addition, no individual customer made up more than 3% of accounts receivable or 4% of net revenue for the years ended December 31, 2017, 2016 and 2015.

Inventories

Inventories consist of insulation, garage doors, rain gutters, shower doors, mirrors, closet shelving and other products. We install these products but do not manufacture them. We value inventory at the lower of cost or market with cost determined using the first-in, first-out (“FIFO”) method. As of December 31, 2017 and 2016, all inventory was finished goods. Inventory provisions are recorded to reduce inventory to the lower of cost or market value for obsolete or slow moving inventory based on assumptions about future demand and marketability of products, the impact of new product introductions, inventory levels and turns, product spoilage, and specific identification of items such as product discontinuance, engineering/material changes, or regulatory-related changes.

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation. We provide for depreciation and amortization of property and equipment using the straight-line method over the expected useful lives of the assets. Expected useful lives of property and equipment vary but generally are the shorter of lease life or five years for vehicles and leasehold improvements, three to five years for furniture, fixtures and equipment and 30 years for buildings.

Major renewals and improvements are capitalized. Maintenance, repairs and minor renewals are expensed as incurred. When assets are retired or otherwise disposed of, the related cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is recorded.

Goodwill

Goodwill results from business combinations and represents the excess of the purchase price over the fair value of acquired tangible assets and liabilities and identifiable intangible assets. Annually, on October 1, or if conditions indicate an earlier review is necessary, we either perform a quantitative test or assess qualitative factors to determine if it is more likely than not that the fair value of the reporting unit is less than its carrying amount and if it is necessary to perform the quantitative two-step goodwill impairment test. If we perform the quantitative test, we compare the carrying value of the reporting unit to an estimate of the reporting unit’s fair value to identify potential impairment. The estimate of the reporting unit’s fair value is determined by weighting a discounted cash flow model and a market-related model using current industry information that involve significant unobservable inputs (Level 3 inputs). In determining the estimated future cash flow, we consider and apply certain estimates and judgments, including current and projected future levels of income based on management’s plans, business trends, prospects, market and economic conditions and market-participant considerations. If the estimated fair value of the reporting unit is less than the carrying value, a second step is performed to determine the amount of the potential goodwill impairment. If impaired, goodwill is written down to its estimated implied fair value.

Impairment of Other Intangible and Long-Lived Assets

Other intangible assets consist of customer relationships, backlog, non-competition agreements and business trademarks and trade names. Amortization of finite lived intangible assets is recorded to reflect the pattern of economic benefits based on projected revenues over their respective estimated useful lives (customer relationships – eight to 15 years, non-competition agreements – one to five years and business trademarks and trade names – eight to 15 years). We do not have any indefinite-lived intangible assets other than goodwill.

We review long-lived assets and intangible assets whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. An impairment loss is recognized when estimated future cash flows expected to result from the use of an asset and its eventual disposition are less than its carrying amount. When impairment is identified, the carrying amount of the asset is reduced to its estimated fair value. Assets to be disposed of are recorded at the lower of net book value or fair market value less cost to sell at the date management commits to a plan of disposal. There was no impairment loss for the years ended December 31, 2017, 2016 and 2015.

Other Liabilities

Our workers’ compensation insurance program, for a significant portion of our business, is considered a high deductible program whereby we are responsible for the cost of claims under approximately $0.8 million. If we do not pay these claims, our workers’ compensation insurance carriers are required to make these payments to the claimants on our behalf. Effective with the plan year beginning October 1, 2015, our general liability insurance program is considered a high retention program whereby we are responsible for the cost of claims up to approximately $2.0 million, subject to an aggregate cap of $8.0 million. If we do not pay these claims, our general liability insurance carrier is required to make these payments to the claimants on our behalf. Prior to the claim year beginning October 1, 2015, our general liability insurance program has a self-incurred retention (“SIR”) of $0.4 million whereby we continue to be responsible for all claims below the SIR and the insurance company continues to be responsible for all liabilities above the SIR. The liabilities represent our best estimate of our costs, using generally accepted actuarial reserving methods, of the ultimate obligations for reported claims plus those incurred but not reported for all claims incurred through December 31, 2017 and 2016. We establish case reserves for reported claims using case-basis evaluation of the underlying claims data and we update as information becomes known. We regularly monitor the potential for changes in estimates, evaluate our insurance accruals and adjust our recorded provisions.

The assumptions underlying the ultimate costs of existing claim losses are subject to a high degree of unpredictability, which can affect the liability recorded for such claims. For example, variability in inflation rates of health care costs inherent in workers’ compensation claims can affect the ultimate costs. Similarly, changes in legal trends and interpretations, as well as a change in the nature and method of how claims are settled, can affect ultimate costs. Our estimates of liabilities incurred do not anticipate significant changes in historical trends for these variables and any changes could have a considerable effect on future claim costs and currently recorded liabilities.

We carry insurance for a number of risks, including, but not limited to, workers’ compensation, general liability, vehicle liability, property and our obligation for employee-related health care benefits. Liabilities relating to claims associated with these risks are estimated by considering historical claims experience, including frequency, severity, demographic factors and other actuarial assumptions. In estimating our liability for such claims, we periodically analyze our historical trends, including loss development, and apply appropriate loss development factors to the incurred costs associated with the claims with the assistance of external actuarial consultants. While we do not expect the amounts ultimately paid to differ significantly from our estimates, our reserves and corresponding expenses could be affected if future claim experience differs significantly from historical trends and actuarial assumptions.

Advertising Costs

Advertising costs are generally expensed as incurred. Advertising expense was approximately $3.2 million, $3.0 million and $2.3 million for the years ended December 31, 2017, 2016 and 2015, respectively, and is included in selling expense on the Consolidated Statements of Operations and Comprehensive Income.

Deferred Financing Costs

Deferred financing costs and debt issuance costs combined, totaling $6.8 million and $1.7 million, net of accumulated amortization as of December 31, 2017 and 2016, respectively, are amortized over the term of the related debt on a straight-line basis which approximates the effective interest method. The deferred financing costs are included in other non-current assets while the debt issuance costs are included in long-term debt on the Consolidated Balance Sheets as of December 31, 2017 and 2016, respectively. The related amortization expense of these costs combined was $1.1 million, $0.4 million and $0.3 million and is included in interest expense, net on the Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2017, 2016 and 2015, respectively. In addition, we expensed loan costs of approximately $1.0 million and $0.3 million for the years ended December 31, 2017 and 2016, respectively, associated with our Credit and Security Agreement because they did not meet the requirements for capitalization. For the year ended December 31, 2017, we wrote off $2.1 million in loan costs as a result of refinancing our credit facilities. We did not write off any loan costs during the year ended December 31, 2016. For additional information, see Note 6, Long-Term Debt.

Share-Based Compensation

Our share-based compensation program is designed to attract and retain employees while also aligning employees’ interests with the interests of our stockholders. Restricted stock awards are periodically granted to certain employees, officers and non-employee members of our board of directors under the stockholder-approved 2014 Omnibus Incentive Plan.

Equity-based awards: Certain of our stock awards are deemed to be equity-based with a service condition and do not contain a market or performance condition with the exception of performance-based awards granted to certain officers and performance-based restricted stock units. Fair value of the non-performance-based awards to employees and officers is measured at the grant date and amortized to expense over the vesting period of the awards using the straight-line attribution method for all service-based awards with a graded vesting feature. This fair value is reduced by assumed forfeitures and adjusted for actual forfeitures until vesting. We also issue performance stock-based awards to certain officers under our 2014 Omnibus Incentive Plan. The performance-based compensation expense is recorded over the requisite service period using the graded-vesting method for the entire award. Performance-based stock awards are accounted for at fair value at date of grant. We also periodically grant restricted stock units to certain employees under the stockholder-approved 2014 Omnibus Incentive Plan. These units convert to shares upon meeting time- and performance-based requirements.

Liability-based awards: Certain of our stock awards represent a predominately-fixed monetary amount that is to be settled with a variable number of shares. These awards contain both time and performance requirements, and are deemed to be liability-based, which requires that we re-measureto reflect their fair value at the end of each reporting period. The change in fair value each reporting period is recorded as compensation cost, with a corresponding increase or decrease in our share-based liability, either immediately or over the remaining service period depending on the vested status of the award.

Compensation expense for both equity and liability-based restricted stock units is recorded based on an assessment each reporting period of the probability that certain performance goals will be met during the contingent vesting period. If performance goals are not probable to occur, no compensation expense will be recognized. If performance goals that were previously deemed probable are not or are not expected to be met, the previously recognized compensation cost related to such performance goals will be reversed. Employees and officers are subject to tax at the vesting date based on the market price of the shares on that date, or on the grant date if an election is made.

Income Taxes

We account for income taxes using the asset and liability method. Under this method, the amount of taxes currently payable or refundable are accrued and deferred tax assets and liabilities are recognized for the estimated future tax consequences of temporary differences that currently exist between the tax basis and financial reporting basis of our assets and liabilities.

Valuation allowances are established against deferred tax assets when it is more likely than not that the realization of those deferred tax assets will not occur. In evaluating our ability to recover our deferred tax assets within the jurisdiction from which they arise, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, the ability to produce future taxable income, prudent and feasible tax planning strategies and recent financial operations. In projecting future taxable income, we factor in historical results and changes in accounting policies and incorporate assumptions, including the amount of future federal and state pretax operating income, the reversal of temporary differences and the implementation of feasible and prudent tax planning strategies. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates we use to manage the underlying businesses.

Deferred tax assets and liabilities are measured using the enacted tax rates in effect in the years when those temporary differences are expected to reverse. The effect on deferred taxes from a change in tax rate is recognized through operations in the period that includes the enactment date of the change. Changes in tax laws and rates could also affect recorded deferred tax assets and liabilities in the future. The Tax Cuts and Jobs Act (the “Tax Act”) that was enacted on December 22, 2017 reduces the US federal corporate tax rate from 35% to 21% effective January 1, 2018. The Company recognized a $3.8 million tax benefit as a result of revaluing the ending net deferred tax liabilities from 35% to the newly enacted U.S. corporate income tax rate of 21%. See Note 12, Income Taxes, for additional information.

A tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits. Income tax positions must meet a more likely than not recognition threshold to be recognized.

We recognize tax liabilities for uncertain tax positions and adjust these liabilities when our judgment changes as a result of the evaluation of new information not previously available. Liabilities related to uncertain tax positions are recorded in other long-term liabilities on the Consolidated Balance Sheets. Due to the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the current estimate of the tax liabilities. These differences will be reflected as increases or decreases to income tax expense and the effective tax rate in the period in which the new information becomes available. Interest and penalties related to unrecognized tax benefits are recognized within income tax expense in the Consolidated Statements of Operations and Comprehensive Income. Accrued interest and penalties are recognized in other current liabilities on the Consolidated Balance Sheets.

Our income tax expense, deferred tax assets and liabilities and reserves for unrecognized tax benefits reflect management’s best assessment of estimated future taxes to be paid. We are subject to income taxes in the United States, which includes numerous state and local jurisdictions. Significant judgments and estimates are required in determining the income tax expense, deferred tax assets and liabilities and the reserve for unrecognized tax benefits.

Estimated Fair Value of Financial Instruments

Accounts receivable, accounts payable, cash and cash equivalents, short-term investments and accrued liabilities as of December 31, 2017 and 2016 approximate their fair value due to the short-term maturities of these financial instruments. The carrying amounts of our long-term debt, including the term loan, delayed draw term loan and revolving line of credit under the current and previous credit agreements approximate their fair values as of December 31, 2017 and 2016 due to the variable rate nature of the agreements. The carrying amount of the obligations associated with our capital leases and vehicle and equipment notes approximate fair value as of December 31, 2017 and 2016 because we have incurred the obligations within recent fiscal years when the interest rate markets have been low and stable despite the changes in the interest rate environment in 2017. Refinancing these obligations at current market rates would result in similar balances. All debt classifications represent Level 2 fair value measurements.

Recently Adopted Accounting Pronouncements

We have not recently adopted any new accounting pronouncements that have had a material impact on our financial statements. We continuously review the Federal Accounting Standards Board’s issued Accounting Standards Updates to ensure we have adopted all current accounting pronouncements, and include any such standard adoptions that are deemed to have a material impact on our financial statements herein.

Recently Issued Accounting Pronouncements Not Yet Adopted

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 and related subsequently issued amendments set forth a new revenue recognition model that requires identifying the contract(s) with a customer, identifying the performance obligations in the contract, determining the transaction price, allocating the transaction price to the performance obligations and recognizing the revenue upon satisfaction of performance obligations. In July 2015, the FASB voted to defer the application of the provisions of this standard for public companies until annual reporting periods beginning after December 15, 2017, including interim periods within those reporting periods. We commenced our evaluation of the impact of ASC 606 in late 2016, by evaluating its impact on selected contracts. Based on our initial review of those select contracts, we developed a project plan to evaluate numerous contracts across our business and assess the internal control structure in order to adopt ASC 606 on January 1, 2018. We have periodically briefed our Audit Committee on our progress made towards adoption. As of December 31, 2017, we have completed our assessment on the applicability of the standard on accounting for contracts with customers. The standard will result in a change to the timing of revenue recognition for certain of our contracts that, under ASC 605, we currently recognize revenue on a performance obligation level as each obligation is completed whereas, under ASC 606, we will recognize revenue associated with these contracts over time as service is performed and the transfer of control occurs based on a percentage-of-completion method using input methods as a measure of progress. We do not expect the impact on our revenue recognition to be material for our contracts that are currently recognized under the existing percentage of completion method of accounting, due to the inherent similarities of the over time methodology of revenue recognition to percentage-of-completion. We adopted the new standard on January 1, 2018, using the modified retrospective approach, and as such will recognize the cumulative effect of initially applying the standard as an adjustment to the opening balance of retained earnings on January 1, 2018. The estimated adjustment to our opening retained earnings on January 1, 2018, as a result of implementation of this ASU, is estimated to be approximately $3.0 million.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” This update amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. For public business entities, this update is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those fiscal years, and early adoption is permitted as of the standard’s issuance date. We have not completed our assessment, but we expect the adoption of this standard will have a significant impact on our Consolidated Balance Sheets. Information about our undiscounted future lease payments and the timing of those payments is in Note 14, Commitments and Contingencies, in our Form 10-K. We will adopt this standard effective January 1, 2019.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” This ASU amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. In addition, these amendments require the measurement of all expected credit losses for financial assets, including trade accounts receivable, held at the reporting date based on historical experience, current conditions and reasonable and supportable forecasts. For public business entities, this update is effective for financial statements issued for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. We are evaluating whether this ASU will have a material impact on our consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows: Clarification of Certain Cash Receipts and Cash Payments (Topic 230).” This ASU addresses the diversity in practice related to the classification of certain cash receipts and payments in the statement of cash flows by adding or clarifying guidance on eight specific cash flow issues. We have determined that this update addresses one issue that specifically impacts us, which is the classification of contingent consideration payments made after a business combination. We adopted the new provision on January 1, 2018 and as such will classify contingent consideration payments in excess of the recorded contingent liability not made soon after the acquisition date as operating activities on the cash flow statement. Cash payments made soon after the acquisition date will be classified as investing activities.

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.” This ASU better aligns a company’s risk management activities and financial reporting for hedging relationships and makes certain improvements to simplify the application of hedge accounting guidance. For public business entities, this update is effective for financial statements issued for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. We are evaluating whether this ASU will have a material impact on our consolidated financial statements.

Investments	12 Months Ended
Investments	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	NOTE 3 – INVESTMENTS Cash and cash equivalents includes investments in money market funds that are valued based on the net asset value of the funds. The cash equivalents consist primarily of money market funds that are Level 1 measurements. The investments in these funds were $55.6 million as of December 31, 2017. We had no such investments as of December 31, 2016. All other investments are classified as held-to-maturity and consist of highly liquid instruments including primarily corporate bonds and commercial paper. As of December 31, 2017, the amortized cost of these investments equaled the net carrying value, which was $30.1 million. We had no such investments as of December 31, 2016. All held-to-maturity securities as of December 31, 2017 mature in one year or less. See Note 8, Fair Value Measurements, for additional information.

Property and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment

NOTE 4 – PROPERTY AND EQUIPMENT

Property and equipment consisted of the following (in thousands):


	As of December 31,
	2017			2016
Land	$	66		$	66
Buildings		218			218
Leasehold improvements		6,152			5,235
Furniture, fixtures and equipment		30,863			26,344
Vehicles and equipment		153,744			124,861

		191,043			156,724
Less: accumulated depreciation and amortization		(109,968	)		(88,936	)

	$	81,075		$	67,788

During the twelve months ended December 31, 2017 and 2016 we recorded the following depreciation and amortization expense on our property and equipment, by income statement category (in thousands):


	As of December 31,
	2017		2016		2015
Cost of sales	$	26,731	$	22,294	$	16,101
Administrative		1,554		1,276		874

Property and equipment as of December 31, 2017 and 2016 of $49.7 million and $42.7 million, respectively, were fully depreciated but still being utilized in our business.

Goodwill and Intangibles

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangibles

NOTE 5 – GOODWILL AND INTANGIBLES

Goodwill

The change in carrying amount of goodwill was as follows (in thousands):


	Goodwill (Gross)			Accumulated Impairment Losses			Goodwill (Net)
January 1, 2016	$	160,516		$	(70,004	)	$	90,512
Business combinations		16,918			—			16,918
Other		(344	)		—			(344	)

December 31, 2016		177,090			(70,004	)		107,086
Business combinations		47,727			—			47,727
Other		653			—			653

December 31, 2017	$	225,470		$	(70,004	)	$	155,466

Other changes included in the above table for the years ended December 31, 2017 and 2016 include minor adjustments for the allocation of certain acquisitions still under measurement. In addition, other changes for the year ended December 31, 2017 include multiple immaterial tuck-in acquisitions. For additional information regarding changes to goodwill resulting from acquisitions, see Note 15, Business Combinations.

At October 1, 2017, our measurement date, we performed a qualitative analysis that weighed all evidence of potential impairment, whether positive or negative, and determined that no factors existed that indicated an impairment of goodwill more likely than not existed. As such, no impairment of goodwill was recognized for the year ended December 31, 2017. In addition, no impairment of goodwill was recognized for the years ended December 31, 2016 or 2015.

Intangibles, net

The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in thousands):


	As of December 31,
	2017						2016
	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Amortized intangibles:
Customer relationships	$	121,015	$	38,651	$	82,364	$	80,909	$	27,533	$	53,376
Covenants not-to-compete		11,807		4,773		7,034		8,602		2,466		6,136
Trademarks and tradenames		58,136		14,076		44,060		37,303		10,498		26,805
Backlog		13,600		9,067		4,533		—		—		—

	$	204,558	$	66,567	$	137,991	$	126,814	$	40,497	$	86,317

There was no intangible asset impairment loss for the years ended December 31, 2017, 2016 and 2015.

The gross carrying amount of intangibles increased approximately $77.7 million and $30.4 million during the years ended December 31, 2017 and 2016, respectively. Intangibles associated with business combinations accounted for approximately $76.8 million and $30.3 million of the increases during the years ended December 31, 2017 and 2016, respectively, with the remaining changes due to other factors. For more information, see Note 15, Business Combinations. Amortization expense on intangible assets totaled approximately $26.9 million, $11.3 million and $6.3 million during the years ended December 31, 2017, 2016 and 2015, respectively. Remaining estimated aggregate annual amortization expense is as follows (in thousands):


2018	$	23,516
2019		18,387
2020		17,671
2021		16,653
2022		15,735
Thereafter		46,029

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Long-Term Debt

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long-Term Debt

NOTE 6 – LONG-TERM DEBT

Long-term debt consisted of the following (in thousands):


	As of December 31,
	2017			2016
Term loans, in effect, net of unamortized debt issuance costs of $5,146 and $447, respectively	$	293,354		$	95,803
Delayed draw term loans, in effect, net of unamortized debt issuance costs of $0 and $50, respectively		—			12,450
Vehicle and equipment notes, maturing December 2022; payable in various monthly installments, including interest rates ranging from 2% to 4.5%		50,357			38,186
Various notes payable, maturing through March 2025; payable in various monthly installments, including interest rates ranging from 4% to 6%		3,866			4,988

		347,577			151,427
Less: current maturities		(16,650	)		(17,192	)

Long-term debt, less current maturities	$	330,927		$	134,235

On April 13, 2017, we entered into a term loan credit agreement (the “Term Loan Agreement”) which provides for a seven-year $300.0 million term loan facility (the “Term Loan”) and an asset-based lending credit agreement (the “ABL Credit Agreement” and together with the Term Loan Agreement, the “Senior Secured Credit Agreements”) which provides for up to approximately $100.0 million with a sublimit up to $50.0 million for the issuance of letters of credit (the “ABL Revolver” and together with the Term Loan, the “Senior Secured Credit Facilities”), which may be reduced or increased pursuant to the ABL Credit Agreement. The borrowing base for the ABL Revolver, which determines availability under the facility, is based on a percentage of the value of certain assets securing the obligations of the Company and the subsidiary guarantors under the ABL Credit Agreement. Proceeds from the Senior Secured Credit Facilities were used to repay in full all amounts outstanding under the Credit and Security Agreement (the “Credit and Security Agreement”), dated as of February 29, 2016, by and among the Company and the lenders named therein.

The Term Loan was amended on November 30, 2017 (the “Amendment”) to refinance the total principal amount of the Term Loan outstanding under the Term Loan Agreement immediately prior to the effective date of the Amendment, or an aggregate principal amount of $299.3 million, on substantially the same terms as the initial term loan, except for (i) a decrease in the Applicable Margins (as defined below) applicable to the base rate and Eurodollar rate loans, (ii) an increase in the cap on permitted indebtedness related to capital expenditures other than capital lease obligations and (iii) the inclusion of a mechanism to establish an alternative Eurodollar rate if certain circumstances have arisen such that the London Interbank Offered Rate may no longer be used. The ABL Credit Agreement was amended in December 2017 to revise the formula for maximum indebtedness incurred by the Company while subject to the ABL Credit Agreement. The Term Loan amortizes in quarterly principal payments of approximately $0.8 million, with any remaining unpaid balances due on April 15, 2024, which is the maturity date. Loans incurred under the ABL Revolver will have a final maturity of April 13, 2022.

Subject to certain exceptions, the Term Loan will be subject to mandatory pre-payments equal to (i) 100% of the net cash proceeds from issuances or incurrence of debt by the Company or any of its restricted subsidiaries (other than with respect to certain permitted indebtedness); (ii) 100% of the net cash proceeds from certain sales or dispositions of assets by the Company or any of its restricted subsidiaries in excess of a certain amount and subject to customary reinvestment provisions and certain other expenses; and (iii) 50% (with step-downs to 25% and 0% based upon achievement of specified net leverage ratios) of excess cash flow of the Company and its restricted subsidiaries in excess of $5.0 million, subject to customary exceptions and limitations.

Loans under the Senior Secured Credit Facilities bear interest based on, at the Company’s election, either the base rate or the Eurodollar rate plus, in each case, an applicable margin (the “Applicable Margin”). The Applicable Margin in respect of loans under (i) the Term Loan Agreement will be (A) 2.50% in the case of Eurodollar rate loans and (B) 1.50% in the case of base rate loans, and (ii) the ABL Facility will be (A) 1.25%, 1.50% or 1.75% in the case of Eurodollar rate loans (based on a measure of availability under the ABL Facility) and (B) 0.25%, 0.50% or 0.75% in the case of base rate loans (based on a measure of availability under the ABL Facility).

In addition, we will pay customary commitment fees and letter of credit fees under the ABL Credit Agreement. The commitment fees will vary based upon a measure of our utilization under the ABL Revolver.

The Senior Secured Credit Agreements each contain a number of customary affirmative and negative non-financial covenants, and the ABL Credit Agreement also contains a financial covenant requiring the satisfaction of a minimum fixed charge coverage ratio of 1.00 to 1.00 in the event that we do not meet a minimum measure of availability under the ABL Revolver.

Vehicle and Equipment Notes

We are party to a Master Loan and Security Agreement (“Master Loan and Security Agreement”), a Master Equipment Lease Agreement (“Master Equipment Agreement”) and one or more Master Loan Agreements (“Master Loan Agreements”) with various lenders to provide financing for the purpose of purchasing or leasing vehicles and equipment used in the normal course of business. Each financing arrangement under these agreements constitutes a separate note and obligation. Vehicles and equipment purchased or leased under each financing arrangement serve as collateral for the note applicable to such financing arrangement. Regular payments are due under each note for a period of typically 60 consecutive months after the incurrence of the obligation. The specific terms of each note are based on specific criteria, including the type of vehicle or equipment and the market interest rates at the time. No termination date applies to these agreements. One of these Master Loan Agreements, entered into in November 2017, is with US Bank and provides for up to $100.0 million. The facility is subject to a 60-month term with interest rates being set at the time of funding. As of December 31, 2017, substantially all of the $100.0 million US Bank Master Loan was available for purchases of equipment.

Total gross assets relating to our master loan and equipment agreements were $74.5 million and $48.7 million as of December 31, 2017 and 2016, respectively, none of which were fully depreciated as of December 31, 2017 or 2016, respectively. The net book value of assets under these agreements was $51.4 million and $38.0 million as of December 31, 2017 and 2016, respectively. Depreciation of assets held under these agreements is included within cost of sales on the Consolidated Statements of Operations and Comprehensive Income.

Costs and Estimated Earnings on Uncompleted Contracts

12 Months Ended

Dec. 31, 2017

Contractors [Abstract]

Costs and Estimated Earnings on Uncompleted Contracts

NOTE 7 – COSTS AND ESTIMATED EARNINGS ON UNCOMPLETED CONTRACTS

Uncompleted contracts were as follows (in thousands):


	As of December 31, 2017
Costs incurred on uncompleted contracts	$	79,235
Estimated earnings		44,035

Total		123,270

Less: Billings to date		121,464

Net under (over) billings	$	1,806

Net under (over) billings were as follows (in thousands):


	As of December 31, 2017
Costs and estimated earnings in excess of billings on uncompleted contracts	$	6,182
Billings in excess of costs and estimated earnings on uncompleted contracts		(4,376	)

Net under (over) billings	$	1,806

The asset, costs and estimated earnings in excess of billings on uncompleted contracts, represents revenues recognized in excess of amounts billed and is included in other current assets in our Consolidated Balance Sheets. The liability, billings in excess of costs and estimated earnings on uncompleted contracts, represents billings in excess of revenues recognized and is included in other current liabilities in our Consolidated Balance Sheets.

Fair Value Measurements

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

NOTE 8 – FAIR VALUE MEASUREMENTS

Fair Values

Fair value is the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

ASC 820, “Fair Value Measurement,” establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:

Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

In many cases, a valuation technique used to measure fair value includes inputs from multiple levels of the fair value hierarchy. The lowest level of significant input determines the placement of the entire fair value measurement in the hierarchy. During the periods presented, there were no transfers between fair value hierarchical levels.

Assets Measured at Fair Value on a Nonrecurring Basis

Certain assets are measured at fair value on a nonrecurring basis in periods subsequent to initial recognition. Assets measured at fair value on a nonrecurring basis as of December 31, 2017 and 2016 are categorized based on the lowest level of significant input to the valuation. The assets are measured at fair value when our impairment assessment indicates a carrying value for each of the assets in excess of the asset’s estimated fair value. Undiscounted cash flows, a Level 3 input, are utilized in determining estimated fair values. During each of the years ended December 31, 2017, 2016 and 2015, we did not record any impairments on these assets required to be measured at fair value on a nonrecurring basis. See the “Impairment of Other Intangible and Long-Lived Assets” caption of Note 2, Significant Accounting Policies, for more information.

Estimated Fair Value of Financial Instruments

The fair values of financial assets and liabilities not described above were as follows (in thousands):


	As of December 31, 2017
	Total		Level 1		Level 2		Level 3
Financial assets:
Cash equivalents	$	55,634	$	55,634	$	—	$	—
Investments		30,038		—		30,038		—
Derivative financial instruments, net of tax		618				618

Total financial assets	$	86,290	$	55,634	$	30,656	$	—

We had no such items upon which to report fair value as of December 31, 2016. See Note 3, Investments, for more information on cash equivalents and investments included in the table above. Also see Note 9, Derivatives and Hedging Activities, for more information on derivative financial instruments. In addition, see Note 2 for more information regarding our accounting for fair value instruments.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Derivatives and Hedging Activities	12 Months Ended
Derivatives and Hedging Activities	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	NOTE 9 – DERIVATIVES AND HEDGING ACTIVITIES Risk Management Objective of Using Derivatives We are exposed to certain risks arising from both our business operations and economic conditions. We manage exposure to a wide variety of business and operational risks through our core business activities. We manage economic risks, including interest rate, liquidity and credit risk primarily by overseeing the amount, sources and duration of debt funding and the use of derivative financial instruments. Specifically, we have entered into derivative financial instruments to manage exposure to interest rate movements that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Our derivative financial instruments are used to manage differences in the amount, timing and duration of our known or expected cash receipts and known or expected cash payments principally related to our investments and borrowings. Cash Flow Hedges of Interest Rate Risk Our purpose for using interest rate derivatives is to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish these objectives, we primarily use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. As of December 31, 2017, we have two interest rate swaps with a beginning notional of $100.0 million that amortize quarterly to $95.3 million at a maturity date of May 31, 2022. We did not have any derivative instruments as of December 31, 2016. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During 2017, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives, when present, is recognized directly in earnings. During the twelve months ended December 31, 2017, we recorded $0.1 million as a result of hedge ineffectiveness in earnings. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense, net as interest payments are made on our variable-rate debt. Over the next twelve months, we estimate that an additional $0.2 million will be reclassified as an increase to interest expense, net. Additionally, we do not use derivatives for trading or speculative purposes and we currently do not have any derivatives that are not designated as hedges. As of December 31, 2017, the Company has not posted any collateral related to these agreements.

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity	NOTE 10 – STOCKHOLDERS’ EQUITY As of December 31, 2017, we had $0.5 million in accumulated other comprehensive income on our Consolidated Balance Sheet, which represents the effective portion of the unrealized gain on our derivative instruments. For additional information, see Note 9, Derivatives and Hedging Activities. In March 2015, we entered into a share repurchase agreement with Installed Building Systems, Inc. (“IBS”), a related party, for the purchase of 315 thousand shares of our common stock for a purchase price of approximately $6.1 million or $19.23 per share, which represented a 7.5% discount to the last reported price of our common stock on March 13, 2015. The effect of these treasury shares reducing the number of common shares outstanding is reflected in our earnings per share calculation. For additional information, see Note 13, Related Party Transactions.

Employee Benefits

12 Months Ended

Dec. 31, 2017

Postemployment Benefits [Abstract]

Employee Benefits

NOTE 11 – EMPLOYEE BENEFITS

Healthcare

We participate in multiple healthcare plans, of which our primary plan is partially self-funded with an insurance company paying benefits in excess of stop loss limits per individual. Our healthcare benefit expense (net of employee contributions) was approximately $17.4 million, $15.2 million and $11.8 million for the years ended December 31, 2017, 2016 and 2015, respectively, for all plans. An accrual for estimated healthcare claims incurred but not reported (“IBNR”) is included within accrued compensation on the Consolidated Balance Sheets and was $1.8 million and $1.7 million as of December 31, 2017 and 2016, respectively.

Workers’ Compensation

We participate in multiple workers’ compensation plans. Under these plans, for a significant portion of our business, we use a high deductible program to cover losses above the deductible amount on a per claim basis. We accrue for the estimated losses occurring from both asserted and unasserted claims. Workers’ compensation liability for premiums is included in other current liabilities on the Consolidated Balance Sheets. Insurance claims and reserves include accruals of estimated settlements for known claims, as well as accruals of actuarial estimates of IBNR claims. In estimating these reserves, historical loss experience and judgments about the expected levels of costs per claim are considered. These claims are accounted for based on actuarial estimates of the undiscounted claims, including IBNR. We believe the use of actuarial methods to account for these liabilities provides a consistent and effective way to measure these highly judgmental accruals.

Workers’ compensation expense totaled $13.5 million, $12.1 million and $12.0 million for the years ended December 31, 2017, 2016 and 2015, respectively, and is included in cost of sales on the Consolidated Statements of Operations and Comprehensive Income. Workers’ compensation known claims and IBNR reserves included on the Consolidated Balance Sheets were as follows (in thousands):


	As of December 31,
	2017		2016
Included in other current liabilities	$	5,899	$	4,595
Included in other long-term liabilities		8,721		7,052

	$	14,620	$	11,647

We also had an insurance receivable for claims that exceeded the stop loss limit included on the Consolidated Balance Sheets. This receivable offsets an equal liability included within the reserve amounts noted above and was as follows (in thousands):


	As of December 31,
	2017		2016
Included in other non-current assets	$	1,826	$	1,249

Profit-Sharing Plans

We also participate in various profit-sharing and 401(k) plans. Certain plans provide that eligible employees can defer a portion of their wages into the trust, subject to current Internal Revenue Code rules and limitations. We provide a matching contribution of wages deferred by employees and can also make discretionary contributions to each plan. Certain plans allow for discretionary employer contributions only. These plans cover substantially all our eligible employees. During the years ended December 31, 2017, 2016 and 2015, we recognized 401(k) plan expenses of $1.6 million, $1.3 million and $0.8 million, respectively, which is included in administrative expenses on the accompanying Consolidated Statements of Operations and Comprehensive Income.

Share-Based Compensation

Directors

We periodically grant shares of restricted stock to members of our board of directors. Accordingly, we record compensation expense within administrative expenses on the Consolidated Statements of Operations and Comprehensive Income at the time of the grant.

In 2017, 2016 and 2015, we granted approximately six thousand, nine thousand and 13 thousand shares of restricted stock, respectively, at a price of $50.50, $34.23 and $22.74 per share, respectively (which represents market price on the grant dates), to non-employee members of our board of directors. Accordingly, for each of the years ended December 31, 2017, 2016 and 2015, we recorded $0.3 million in compensation expense related to these grants within administrative expenses on the Consolidated Statements of Operations and Comprehensive Income at the time of grant. These shares vested on the grant date since there is no service period associated with these awards.

The weighted-average grant date fair value is the same as the issue price for all shares.

Employees – Common Stock Awards

During the twelve months ended December 31, 2017, we granted approximately 0.1 million shares of restricted stock which vest in three equal installments (rounded to the nearest whole share) on each of April 20, 2018, 2019 and 2020 to certain employees. During the twelve months ended December 31, 2016, we granted approximately 0.1 million shares of restricted stock which vest in three equal installments (rounded to the nearest whole share) on each of April 20, 2017, 2018 and 2019 to certain employees.

During the twelve months ended December 31, 2017, our employees surrendered approximately 11 thousand shares of our common stock to satisfy tax withholding obligations arising in connection with the vesting of such common stock awards previously issued under our 2014 Omnibus Incentive Plan. We recorded $2.7 million and $1.6 million in compensation expense related to these grants within administrative expenses on the Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2017 and 2016, respectively. We recognized excess tax benefits within income tax provision on the Consolidated Statements of Operations and Comprehensive Income of approximately $0.6 million and $0.3 million for the years ended December 31 2017 and 2016, respectively.

As of December 31, 2017, there was $5.5 million of unrecognized compensation expense related to these nonvested common stock awards. This expense is subject to future adjustments for forfeitures and is expected to be recognized on a straight-line basis over the remaining weighted-average period of 2.0 years. Shares forfeited are returned as treasury shares and available for future issuances. See the table below for changes in shares and related weighted average fair market value per share.

Employees – Performance-Based Stock Awards

During the twelve months ended December 31, 2017, we established, and our Board of Directors approved, performance-based targets in connection with common stock awards to be issued to certain officers in 2018 contingent upon achievement of these targets. We recorded $0.9 million in compensation expense associated with these performance-based awards.

As of December 31, 2017, there was $1.7 million of unrecognized compensation expense related to nonvested performance-based common stock awards. This expense is subject to future adjustments for forfeitures and is expected to be recognized over the remaining weighted-average period of 1.9 years using the graded-vesting method. See the table below for changes in shares and related weighted average fair market value per share.

In addition, during the twelve months ended December 31, 2017, we established, and our Board of Directors approved, performance-based restricted stock awards to be issued to certain employees between 2018 and 2022 contingent upon achievement of certain performance targets. These awards will be accounted for as liability-based awards since they represent a predominantly-fixed monetary amount that will be settled with a variable number of common shares and as such are included in other long-term liabilities on the Consolidated Balance Sheets. We recorded $0.1 million in compensation expense associated with these performance-based awards. The unrecognized compensation expense associated with the liability-based awards is subject to fair value adjustment each reporting period, and is expected to be recognized on a straight-line basis over the remaining vesting period of 4 years.

Employees – Performance-Based Restricted Stock Units

During the twelve months ended December 31, 2017, we established, and our Board of Directors approved, performance-based restricted stock units in connection with common stock awards to be issued to certain employees in 2018 contingent upon achievement of a performance target. These units will be accounted for as equity-based awards that will be settled with a fixed number of common shares. We recorded $2.6 million in compensation expense associated with these performance-based units during the twelve months ended December 31, 2017.

As of December 31, 2017, there was $1.1 million of unrecognized compensation expense related to nonvested performance-based common stock units. This expense is subject to future adjustments for forfeitures and is expected to be recognized on a straight-line basis over the remaining weighted-average period of 0.3 years. See the table below for changes in shares and related weighted average fair market value per share.

Share-Based Compensation Summary

Amounts for each category of equity-based award for employees as of December 31, 2017 and changes during the twelve months ended December 31, 2017 were as follows:


	Common Stock Awards					Performance-Based Stock Awards				Performance-Based Restricted Stock Units
	Awards			Weighted Average Fair Market Value Per Share		Awards		Weighted Average Fair Market Value Per Share		Units			Weighted Average Fair Market Value Per Share
Nonvested awards/units at December 31, 2016		161,174		$	26.36		—	$	—		—		$	—
Granted		101,241			52.00		77,254		41.00		74,818			52.16
Vested		(58,302	)		26.43		—		—		—			—
Forfeited/Cancelled		(1,782	)		35.07		—		—		(2,818	)		52.00

Nonvested awards/units at December 31, 2017		202,331		$	39.09		77,254	$	41.00		72,000		$	52.16

During the twelve months ended December 31, 2017 and 2016, we recorded the following stock compensation expense, by income statement category (in thousands):


	2017		2016
Cost of sales	$	965	$	—
Selling		571		—
Administrative		5,055		1,894

	$	6,591	$	1,894

Administrative stock compensation expense includes all stock compensation earned by our administrative personnel, while cost of sales and selling stock compensation represents all stock compensation earned by our installation and sales employees, respectively.

As of December 31, 2017, approximately 2.6 million of the 3.0 million shares of common stock authorized for issuance were available for issuance under the 2014 Omnibus Incentive Plan.

Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 12 – INCOME TAXES

The provision for income taxes is comprised of (in thousands):


	Years ended December 31,
	2017			2016			2015
Current:
Federal	$	17,557		$	18,307		$	13,939
State		3,302			3,472			2,989

		20,859			21,779			16,928
Deferred:
Federal		(5,895	)		(338	)		(1,255	)
State		(284	)		(267	)		(260	)

		(6,179	)		(605	)		(1,515	)

Total tax expense	$	14,680		$	21,174		$	15,413

The reconciliation between our effective tax rate on net income and the federal statutory rate is as follows (dollars in thousands):


	Years ended December 31,
	2017					2016					2015
Income tax at federal statutory rate	$	19,537		35.0	%	$	20,864		35.0	%	$	14,676		35.0	%
Stock compensation		(581	)	(1.0	%)		(227	)	(0.4	%)		—		0.0	%
Qualified Production Activity Deduction		(1,715	)	(3.1	%)		(1,776	)	(3.0	%)		(1,347	)	(3.2	%)
Other permanent items		197		0.4	%		(92	)	(0.1	%)		(69	)	(0.2	%)
Change in valuation allowance		285		0.5	%		442		0.7	%		467		1.1	%
Change in uncertain tax positions		(1,807	)	(3.2	%)		66		0.1	%		(559	)	(1.3	%)
State income taxes, net of federal benefit		2,150		3.8	%		1,897		3.2	%		2,245		5.4	%
Rate impact of the Tax Act		(3,386	)	(6.1	%)		—		—	%		—		—	%

Total tax expense	$	14,680		26.3	%	$	21,174		35.5	%	$	15,413		36.8	%

Components of the net deferred tax asset or liability are as follows (in thousands):


	As of December 31,
	2017			2016
Deferred Tax Assets
Long-term
Accrued reserves and allowances	$	3,916		$	1,866
Allowance for doubtful accounts		426			448
Inventories		213			284
Intangibles		3,279			806
Net operating loss carryforwards		2,623			2,921
Other current and long-term		10			2

Long-term deferred tax assets		10,467			6,327
Less: Valuation allowance		(1,746	)		(2,415	)

Net deferred tax assets		8,721			3,912
Deferred Tax Liabilities
Long-term
Accrued reserves and allowances		(308	)		(565	)
Property and equipment		(1,453	)		(1,505	)
Intangibles		(3,543	)		(4,899	)
Investment in partnership		(9,189	)		(9,530	)
Other		(208	)		(62	)

Long-term deferred tax liabilities		(14,701	)		(16,561	)

Net deferred tax liabilities	$	(5,980	)	$	(12,649	)

As of December 31, 2017, we have recorded a deferred tax asset of $2.6 million reflecting the benefit of $10.6 million in federal and state income tax net operating loss (NOL) carryforwards, the earliest of which expires in 2030.

Valuation Allowance

We assess the available positive and negative evidence to estimate if sufficient future taxable income will be generated to utilize the existing deferred tax assets on a jurisdiction and by tax filing entity basis. A significant piece of objective negative evidence evaluated is cumulative losses incurred over the most recent three-year period. Such objective evidence limits our ability to consider other subjective positive evidence such as our projections for future growth.

Based on this evaluation, a valuation allowance has been recorded as of December 31, 2017 and 2016 for the net deferred tax assets recorded on certain of our wholly owned subsidiaries. Such deferred tax assets relate primarily to net operating losses that are not more likely than not realizable. However, the amount of the deferred tax asset considered realizable could be adjusted if our estimate of future taxable income during the carryforward period changes, or if objective negative evidence in the form of cumulative losses is no longer present. Additional weight may be given to subjective evidence such as our projections for growth in this situation.

Uncertain Tax Positions

We are subject to taxation in the United States and various state jurisdictions. As of December 31, 2017, our tax years for 2014 through 2016 are subject to examination by the tax authorities. A rollforward of the gross unrecognized tax benefits is as follows (in thousands):


Unrecognized tax benefit, January 1, 2016	$	3,586
Increase as a result of tax positions taken during the period		2,354
Decrease as a result of tax positions taken during the period		(1,356	)
Decrease as a result of expiring statutes		(487	)

Unrecognized tax benefit, December 31, 2016		4,097
Increase as a result of tax positions taken during the period		4,353
Decrease as a result of tax positions taken during the period		(2,311	)
Decrease as a result of expiring statutes		(1,689	)

Unrecognized tax benefit, December 31, 2017	$	4,450

Unrecognized tax benefits of $1.5 million at December 31, 2017 would affect the effective tax rate. Interest expense and penalties accrued related to uncertain tax positions as of December 31, 2017 are $0.1 million.

We expect a decrease to the amount of unrecognized tax benefits (exclusive of penalties and interest) within the next twelve months of zero to $1.1 million.

Determining uncertain tax positions and the related estimated amounts requires judgment and carry estimation risk. If future tax law changes or interpretations should come to light, or additional information should become known, our conclusions regarding unrecognized tax benefits may change.

Impacts of the Tax Cuts and Jobs Act

The Tax Act was enacted on December 22, 2017. The Tax Act reduces the U.S. federal corporate tax rate from 35% to 21%, which had a positive impact on our 2017 effective tax rate due to the revaluation of our ending net deferred tax liabilities, and we expect it will have a positive impact on our effective tax rate in 2018 and subsequent years.

Income tax expense (benefit) decreased $3.4 million for the year ended December 31, 2017, compared to 2016, due to the impact of the Tax Act. The Company recognized a $3.8 million tax benefit as a result of revaluing the ending net deferred tax liabilities from 35% to the newly enacted U.S. corporate income tax rate of 21%. The tax benefit was partially offset by tax expense of $0.4 million net amount for the revaluation of the uncertain tax positions and the valuation allowance.

The Company has recognized the tax impacts related to the revaluation of deferred tax assets and liabilities and included these amounts in its consolidated financial statements for the year ended December 31, 2017. The ultimate impact may differ from these provisional amounts, possibly materially, due to, among other things, additional analysis, changes in interpretations and assumptions the Company has made, additional regulatory guidance that may be issued, and actions the Company may take as a result of the Tax Act.

Related Party Transactions

12 Months Ended

Dec. 31, 2017

Related Party Transactions

NOTE 13 – RELATED PARTY TRANSACTIONS

We sell installation services to other companies related to us through common or affiliated ownership and/or board of directors and/or management relationships. We also purchase services and materials and pay rent to companies with common or related ownership. For additional information, see Note 14, Commitments and Contingencies.

For the years ended December 31, 2017, 2016 and 2015, the amount of sales to common or related parties as well as the purchases from and rent expense paid to common or related parties were as follows (in thousands):


	Years ended December 31,
	2017		2016		2015
Sales	$	10,250	$	7,914	$	6,720
Purchases		1,294		579		480
Rent		1,154		635		598

At December 31, 2017 and 2016, we had related party balances of approximately $2.0 million and $1.5 million, respectively, included in accounts receivable on our Consolidated Balance Sheets. These balances primarily represent trade accounts receivable arising during the normal course of business with various related parties. M/I Homes, Inc., a customer whose Chairman, President and Chief Executive Officer is a member of our Board of Directors, accounted for $1.0 million and $0.8 million of these balances as of December 31, 2017 and 2016, respectively.

On March 13, 2015, we entered into a share repurchase agreement with IBS for the purchase of 315 thousand shares of our common stock. Jeff Edwards, our Chief Executive Officer, is the President of IBS and, in such role, has sole voting and dispositive power over the shares held by IBS and is deemed the beneficial owner of the shares of our common stock held by IBS. For additional information, see Note 10, Stockholders’ Equity.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 14 – COMMITMENTS AND CONTINGENCIES

Accrued General Liability

Accrued general insurance reserves included on the Consolidated Balance Sheets were as follows (in thousands):


	As of December 31,
	2017		2016
Included in other current liabilities	$	2,033	$	1,949
Included in other long-term liabilities		7,073		7,104

	$	9,106	$	9,053

We also had insurance receivables and an indemnification asset included on the Consolidated Balance Sheets that, in aggregate, offset an equal liability included within the reserve amounts noted above. The amounts were as follows (in thousands):


	As of December 31,
	2017		2016
Insurance receivable and indemnification asset for claims under a fully insured policy	$	2,773	$	2,773
Insurance receivable for claims that exceeded the stop loss limit		2		26

Total insurance receivables included in other non-current assets	$	2,775	$	2,799

Leases

We are obligated under capital leases covering vehicles and certain equipment. The vehicle and equipment leases generally have initial terms ranging from four to six years. Total assets relating to capital leases were approximately $63.4 million and $64.2 million as of December 31, 2017 and 2016, respectively, and a total of approximately $26.8 million and $22.8 million were fully depreciated as of December 31, 2017 and 2016, respectively. The net book value of assets under capital leases was approximately $13.0 million and $16.4 million as of December 31, 2017 and 2016, respectively. Amortization of assets held under capital leases is included within cost of sales on the Consolidated Statements of Operations and Comprehensive Income.

We also have several noncancellable operating leases, primarily for buildings, improvements, equipment and certain vehicles. These leases generally contain renewal options for periods ranging from one to five years and require us to pay all executory costs such as property taxes, maintenance and insurance.

Future minimum lease payments under noncancellable operating leases (with initial or remaining lease terms in excess of one year) and future minimum capital lease payments as of December 31, 2017 are as follows (in thousands):


	Capital Leases			Operating Leases
				Related Party		Other		Total Operating
2018	$	6,287		$	950	$	12,304	$	13,254
2019		4,322			837		9,911		10,748
2020		1,688			574		6,775		7,349
2021		882			591		2,932		3,523
2022		25			609		1,795		2,404
Thereafter		—			—		2,523		2,523

		13,204		$	3,561	$	36,240	$	39,801

Less: Amounts representing executory costs		(326	)
Less: Amounts representing interest		(733	)

Total obligation under capital leases		12,145
Less: Current portion of capital leases		(5,666	)

Long term capital lease obligation	$	6,479

Total rent expense under these operating leases for the years ended December 31, 2017, 2016 and 2015 was approximately $15.1 million, $11.6 million and $9.4 million, respectively, which is included in the Consolidated Statements of Operations and Comprehensive Income as follows (in thousands):


	Years ended December 31,
	2017		2016		2015
Cost of Sales	$	813	$	848	$	855
Administrative		14,310		10,732		8,507

Total	$	15,123	$	11,580	$	9,362

Other Commitments and Contingencies

From time to time, various claims and litigation are asserted or commenced against us principally arising from contractual matters and personnel and employment disputes. In determining loss contingencies, management considers the likelihood of loss as well as the ability to reasonably estimate the amount of such loss or liability. An estimated loss is recorded when it is considered probable that such a liability has been incurred and when the amount of loss can be reasonably estimated. As litigation is subject to inherent uncertainties, we cannot be certain that we will prevail in these matters. However, we do not believe that the ultimate outcome of any pending matters will have a material adverse effect on our consolidated financial position, results of operations or cash flows.

Business Combinations

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Business Combinations

NOTE 15 – BUSINESS COMBINATIONS

As part of our ongoing strategy to expand geographically and increase market share in certain markets, we completed ten, nine and eight business combinations during the years ended December 31, 2017, 2016 and 2015, respectively, as well as insignificant tuck-in acquisitions merged into existing operations in 2017 and 2015, in which we acquired 100% of the voting equity interests in each acquired entity. Acquisition-related costs amounted to $3.9 million, $2.3 million and $1.1 million for the years ended December 31, 2017, 2016 and 2015, respectively, and are included in Administrative expenses on the Consolidated Statements of Operations and Comprehensive Income. The goodwill to be recognized in conjunction with these business combinations represents the excess cost of the acquired entity over the net amount assigned to assets acquired and liabilities assumed. We expect to deduct $47.2 million of goodwill for tax purposes as a result of 2017 acquisitions.

The largest of our 2017 acquisitions were Alpha, Columbia Shelving & Mirror Inc. and Charleston Shelving & Mirror, Inc. (collectively, “Columbia”) and All In Insulation, LLC d/b/a Astro Insulation (collectively, “Astro”). The remaining acquisitions were individually insignificant but material in the aggregate, as follows. Net Income (Loss), as noted below, includes amortization, taxes and interest allocations.

For the twelve months ended December 31, 2017 (in thousands):


Name	Date		Acquisition Type		Cash Paid		Seller Obligations		Fair Value of Common Stock Issued		Total Purchase Price		Revenue		Net Income (Loss)
Alpha (1)		1/5/2017		Share	$	103,810	$	2,002	$	10,859	$	116,671	$	116,070	$	(1,148	)
Columbia		6/26/2017		Asset		8,768		225		—		8,993		6,046		86
Astro		9/18/2017		Asset		9,144		482		—		9,626		1,829		11
Other		Various		Asset		15,645		2,419		—		18,064		20,457		573

Total					$	137,367	$	5,128	$	10,859	$	153,354	$	144,402	$	(478	)

(1)

The cash paid included $21.7 million in contingent consideration to satisfy purchase price adjustments related to cash and net working capital requirements, earnout consideration based on Alpha’s change in EBITDA from 2015 and a customary holdback. These payments were based on fair value of each contingent payment at the time of acquisition and subsequently adjusted during the measurement period. We issued 282,577 shares of our common stock with a fair value of $10.9 million.

For the twelve months ended December 31, 2016 (in thousands):


Name	Date		Acquisition Type		Cash Paid		Seller Obligations		Total Purchase Price		Revenue		Net Income (Loss)
Alpine Insulation Co., Inc.		4/12/2016		Asset	$	21,151	$	1,560	$	22,711	$	21,359	$	1,370
East Coast		10/17/2016		Asset		15,589		600		16,189		4,701		21
Other		Various		Asset		18,753		2,299		21,052		19,974		(592	)

Total					$	55,493	$	4,459	$	59,952	$	46,034	$	799

For the twelve months ended December 31, 2015 (in thousands):


Name	Date		Acquisition Type		Cash Paid		Seller Obligations		Total Purchase Price		Revenue		Net Income (Loss)
BDI		3/12/2015		Stock	$	30,680	$	5,765	$	36,445	$	32,505	$	2,023
CQ		4/6/2015		Stock		5,193		2,319		7,512		7,839		556
Layman		6/1/2015		Asset		9,088		600		9,688		8,211		516
Eastern		8/10/2015		Stock		24,199		2,875		27,074		7,368		312
Other		Various		Asset		16,040		1,621		17,661		6,349		(97	)

Total					$	85,200	$	13,180	$	98,380	$	62,272	$	3,310

Purchase Price Allocations

The estimated fair values of the assets acquired and liabilities assumed for the acquisitions, as well as total purchase prices and cash paid, approximated the following (in thousands):


	2017
	Alpha			Columbia			Astro			Other			Total
Estimated fair values:
Cash	$	247		$	—		$	—		$	—		$	247
Accounts receivable		29,851			1,004			924			3,195			34,974
Inventories		1,852			704			296			1,544			4,396
Other current assets		4,500			8			36			96			4,640
Property and equipment		1,528			659			640			1,820			4,647
Intangibles		57,200			4,760			5,168			9,688			76,816
Goodwill		38,511			2,184			2,926			4,106			47,727
Other non-current assets		383			32			—			234			649
Accounts payable and other current liabilities		(17,401	)		(358	)		(364	)		(2,619	)		(20,742	)

Fair value of assets acquired		116,671			8,993			9,626			18,064			153,354
Less fair value of common stock issued		10,859			—			—			—			10,859
Less seller obligations		2,002			225			482			2,419			5,128

Cash paid	$	103,810		$	8,768		$	9,144		$	15,645		$	137,367


	2016
	Alpine			East Coast			Other			Total
Estimated fair values:
Cash	$	—		$	2,181		$	—		$	2,181
Accounts receivable		3,959			3,093			2,502			9,554
Inventories		700			332			1,183			2,215
Other current assets		—			1			24			25
Property and equipment		656			666			1,616			2,938
Intangibles		12,800			6,400			11,067			30,267
Goodwill		6,642			4,346			5,933			16,921
Other non-current assets		—			116			345			461
Accounts payable and other current liabilities		(2,046	)		(946	)		(1,618	)		(4,610	)

Fair value of assets acquired		22,711			16,189			21,052			59,952
Less seller obligations		1,560			600			2,299			4,459

Cash paid	$	21,151		$	15,589		$	18,753		$	55,493


	2015
	BDI			CQ			Layman			Eastern			Other			Total
Estimated fair values:
Cash	$	661		$	100		$	—		$	165		$	—		$	926
Accounts receivable		4,735			1,423			1,245			2,768			4,093			14,264
Inventories		980			152			267			335			720			2,454
Other current assets		368			39			—			109			32			548
Property and equipment		1,006			190			733			1,364			1,574			4,867
Intangibles		21,280			4,350			5,330			13,871			10,534			55,365
Goodwill		16,213			3,035			3,143			9,904			4,809			37,104
Other non-current assets		3,736			—			—			322			60			4,118
Accounts payable and other current liabilities		(3,303	)		(1,539	)		(1,030	)		(1,681	)		(2,220	)		(9,773	)
Deferred income tax liabilities		(5,495	)		—			—			—			(825	)		(6,320	)
Long-term debt		—			—			—			(82	)		—			(82	)
Other long-term liabilities		(3,736	)		(238	)		—			(1	)		—			(3,975	)

Fair value of assets acquired		36,445			7,512			9,688			27,074			18,777			99,496
Gain on bargain purchase		—			—			—			—			(1,116	)		(1,116	)

Total purchase price		36,445			7,512			9,688			27,074			17,661			98,380
Less seller obligations		5,765			2,319			600			2,875			1,621			13,180

Cash paid	$	30,680		$	5,193		$	9,088		$	24,199		$	16,040		$	85,200

Contingent consideration is included as “seller obligations” in the above table or within “fair value of assets acquired” if subsequently paid during the period presented. These contingent payments consist primarily of amounts based on working capital calculations, earnouts based on performance, and non-compete agreements, all of which are based on fair value at the time of acquisition. When these payments are expected to be made over one year from the acquisition date, the contingent consideration is discounted to net present value using our weighted average cost of capital (WACC).

Further adjustments to the allocation for each acquisition still under its measurement period are expected as third-party or internal valuations are finalized, certain tax aspects of the transaction are completed, contingent consideration is settled, and customary post-closing reviews are concluded during the measurement period attributable to each individual business combination. As a result, insignificant adjustments to the fair value of assets acquired, and in some cases total purchase price, have been made to certain business combinations since the date of acquisition and future adjustments may be made through the end of each measurement period. Goodwill and intangibles per the above table do not agree to the total gross increases of these assets as shown in Note 5, Goodwill and Intangibles, during the years ended December 31, 2017 and 2016 due to minor adjustments to goodwill for the allocation of certain acquisitions still under measurement, an immaterial goodwill reclassification in the year ended December 31, 2016 related to the prior period, as well as other immaterial intangible assets added during the ordinary course of business. In addition, goodwill and intangibles increased during the years ended December 31, 2017, 2016 and 2015 due to various immaterial tuck-in acquisitions that do not appear in the above tables.

The provisional amounts for Alpha originally reported in our Condensed Consolidated Balance Sheets included in our Quarterly Report on Form 10-Q for the period ended March 31, 2017 were adjusted to reflect the review and ongoing analysis of the fair value measurements. As a result of our continued evaluation during the measurement period, we increased goodwill by approximately $2.1 million, offset by a corresponding net reduction in various working capital accounts.

The provisional amounts for Columbia originally reported in our Condensed Consolidated Balance Sheets included in our Quarterly Report on Form 10-Q for the period ended June 30, 2017 were adjusted to reflect the review and ongoing analysis of the fair value measurements. As a result of our continued evaluation during the measurement period, we increased goodwill by approximately $0.5 million and our seller obligations by approximately $0.4 million for an adjustment to the fair value of a working capital contingent liability. These adjustments, as well as various other insignificant adjustments, resulted in a total purchase price increase for Columbia of approximately $0.6 million as reflected within the above table and were within applicable measurement period guidelines.

The fair value of the net assets acquired, including identifiable intangible assets, relating to one of the 2015 business combinations included in the “Other” column in the above table was approximately $4.8 million, which exceeds the purchase price of $3.7 million. Accordingly, we recognized the excess of the fair value of the net assets acquired over purchase price paid of approximately $1.1 million as a gain on bargain purchase. The gain on bargain purchase is included in other income in our Consolidated Statements of Operations and Comprehensive Income. Prior to recognizing the gain, we reassessed the fair value of the assets acquired and liabilities assumed in the business combination including consultation with our external valuation experts. Assets were valued using the same methodology as our other business combinations, including the use of a discounted cash flow model as well as several other factors. We believe we were able to acquire this entity for less than the fair value of its net assets due to an absence of multiple bidders combined with the significant improvement of our purchasing power.

Included in other noncurrent assets in the above table as of the year ended December 31, 2015 is an insurance receivable of $2.0 million and an indemnification asset in the amount of $1.7 million associated with the 2015 acquisition of BDI. These assets offset equal liabilities included in other long-term liabilities in the above table, which represent additional insurance reserves for which we may be liable. All amounts are measured at their acquisition date fair value. The indemnification asset has been reduced to $0.9 million as of December 31, 2017 due to an adjustment to an uncertain tax position related to this item.

Estimates of acquired intangible assets related to the acquisitions are as follows (dollars in thousands):


	2017				2016				2015
Acquired intangibles assets	Estimated Fair Value		Weighted Average Estimated Useful Life (yrs)		Estimated Fair Value		Weighted Average Estimated Useful Life (yrs)		Estimated Fair Value		Weighted Average Estimated Useful Life (yrs)
Customer relationships	$	39,922		8	$	18,511		9	$	36,129		8
Trademarks and trade names		20,667		15		8,983		15		14,567		15
Non-competition agreements		2,628		5		2,773		5		4,668		5
Backlog		13,600		1.5		—		—		—		—

Pro Forma Information (unaudited)

The unaudited pro forma information has been prepared as if the 2017 acquisitions had taken place on January 1, 2016, the 2016 acquisitions had taken place on January 1, 2015 and the 2015 acquisitions had taken place on January 1, 2014. The unaudited pro forma information is not necessarily indicative of the results that we would have achieved had the transactions actually taken place on January 1, 2016, 2015 and 2014 and the unaudited pro forma information does not purport to be indicative of future financial operating results (in thousands, except for per share data).


	Unaudited Pro Forma for the years ended December 31,
	2017		2016		2015
Net revenue	$	1,169,061	$	1,058,707	$	786,144
Net income		43,179		43,891		29,463
Basic and diluted net income per share		1.36		1.39		0.94

Unaudited pro forma net income reflects additional intangible asset amortization expense of $1.3 million, $17.5 million and $6.6 million for the years ended December 31, 2017, 2016 and 2015, respectively, as well as additional income tax expense of $0.7 million, $3.0 million and $1.7 million for the years ended December 31, 2017, 2016 and 2015, respectively, and additional interest expense of $1.8 million for the year ended December 31, 2016 that would have been recorded had the 2017 acquisitions taken place on January 1, 2016, the 2016 acquisitions taken place on January 1, 2015 and the 2015 acquisitions taken place on January 1, 2014.

Income Per Common Share	12 Months Ended
Income Per Common Share	Dec. 31, 2017
Earnings Per Share [Abstract]
Income Per Common Share	NOTE 16 – INCOME PER COMMON SHARE Basic net income per common share is calculated by dividing net income by the weighted average shares outstanding during the period, without consideration for common stock equivalents. Diluted net income per common share is calculated by adjusting weighted average shares outstanding for the dilutive effect of common stock equivalents outstanding for the period, determined using the treasury stock method. Potential common stock is included in the diluted income per common share calculation when dilutive. The dilutive effect of outstanding restricted stock awards after application of the treasury stock method as of December 31, 2017, 2016 and 2015, was 117 thousand, 61 thousand and 36 thousand shares, respectively.

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	NOTE 17 – SUBSEQUENT EVENTS On January 16, 2018, we acquired substantially all of the assets of Rocket Insulation & Coatings Inc. for total consideration of approximately $2.2 million, subject to a working capital adjustment. The initial accounting for the business combination was not complete at the time the financial statements were issued due to the timing of the acquisition and the filing of this Annual Report on Form 10-K. As a result, disclosures required under ASC 805-10-50, Business Combinations, cannot be made at this time. In January 2018, we posted $10.0 million into a trust to serve as additional collateral for our workers’ compensation and general liability policies. Beginning January 2018, this $10.0 million is classified as restricted cash on our Consolidated Balance Sheets. IBP’s Board of Directors has approved a stock repurchase program, effective as of March 2, 2018, pursuant to which we may repurchase up to $50 million of its outstanding common stock. The program will remain in effect until February 28, 2019, unless extended by the Board of Directors.

Quarterly Financial Information (Unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information (Unaudited)

NOTE 18 – QUARTERLY FINANCIAL INFORMATION (UNAUDITED)

Summarized unaudited quarterly financial results for 2017 and 2016 is as follows (in thousands, except per share data):


2017	Three months ended
	March 31		June 30		September 30		December 31		Total Year
Net revenue	$	255,669	$	282,196	$	295,193	$	299,869	$	1,132,927
Gross profit		72,172		84,928		85,581		81,345		324,026
Net income		6,364		11,973		12,010		10,793		41,140
Comprehensive income		6,364		11,896		12,042		11,345		41,647
Basic and diluted net income per share		0.20		0.38		0.38		0.34		1.30


2016	Three months ended
	March 31		June 30		September 30		December 31		Total Year
Net revenue	$	191,698	$	211,913	$	225,392	$	233,977	$	862,980
Gross profit		54,591		62,243		67,260		68,354		252,448
Net income		5,813		9,993		11,549		11,081		38,436
Comprehensive income		5,813		9,993		11,549		11,081		38,436
Basic and diluted net income per share		0.19		0.32		0.37		0.35		1.23

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Basis of Presentation and Principles of Consolidation

Use of Estimates

Cash and Cash Equivalents

Revenue Recognition

Revenue and Cost Recognition

Accounting Policy for Derivative Instruments and Hedging Activities

Investment Policy

Business Combinations

Accounts Receivable

We account for trade receivables based on amounts billed to customers. Past due receivables are determined based on contractual terms. We do not accrue interest on any of our trade receivables.

Allowance for Doubtful Accounts


Allowance for doubtful accounts receivable
January 1, 2015	$	2,661
Charged to costs and expenses		919
Charged to other accounts (1)		533
Deductions (2)		(1,627	)

December 31, 2015	$	2,486

Charged to costs and expenses		2,928
Charged to other accounts (1)		435
Deductions (2)		(2,452	)

December 31, 2016	$	3,397

Charged to costs and expenses		2,834
Charged to other accounts (1)		699
Deductions (2)		(2,125	)

December 31, 2017	$	4,805

(1)	Recovery of receivables previously written off as bad debt and other

(2)	Write-off of uncollectible accounts receivable

Concentration of Credit Risk

Inventories

Property and Equipment

Goodwill

Impairment of Other Intangible and Long-Lived Assets

Other Liabilities

Advertising Costs

Deferred Financing Costs

Share-Based Compensation

Liability-based awards: Certain of our stock awards represent a predominately-fixed monetary amount that is to be settled with a variable number of shares. These awards contain both time and performance requirements, and are deemed to be liability-based, which requires that we re-measure to reflect their fair value at the end of each reporting period. The change in fair value each reporting period is recorded as compensation cost, with a corresponding increase or decrease in our share-based liability, either immediately or over the remaining service period depending on the vested status of the award.

Income Taxes

Estimated Fair Value of Financial Instruments

Recently Adopted Accounting Pronouncements

Recently Issued Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” This update amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02 requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application, with an option to use certain transition relief. For public business entities, this update is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those fiscal years, and early adoption is permitted as of the standard’s issuance date. We have not completed our assessment, but we expect the adoption of this standard will have a significant impact on our Consolidated Balance Sheets. Information about our undiscounted future lease payments and the timing of those payments is in Note 14, Commitments and Contingencies, in our Form 10-K. We will adopt this standard effective January 1, 2019.

Organization (Tables)

12 Months Ended

Dec. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Percentage of Net Revenue by Product Category

The following table sets forth the percentage of our net revenue by product category:


	Years ended December 31,
	2017			2016			2015
Insulation		67	%		77	%		78	%
Waterproofing		8			2			2
Shower doors, shelving and mirrors		7			5			5
Garage doors		5			6			6
Rain gutters		4			4			5
Other building products		9			6			4

		100	%		100	%		100	%

Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Allowance for Doubtful Accounts

The following table sets forth our allowance for doubtful accounts (in thousands):


Allowance for doubtful accounts receivable
January 1, 2015	$	2,661
Charged to costs and expenses		919
Charged to other accounts (1)		533
Deductions (2)		(1,627	)

December 31, 2015	$	2,486

Charged to costs and expenses		2,928
Charged to other accounts (1)		435
Deductions (2)		(2,452	)

December 31, 2016	$	3,397

Charged to costs and expenses		2,834
Charged to other accounts (1)		699
Deductions (2)		(2,125	)

December 31, 2017	$	4,805

(1)	Recovery of receivables previously written off as bad debt and other

(2)	Write-off of uncollectible accounts receivable

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following (in thousands):


	As of December 31,
	2017			2016
Land	$	66		$	66
Buildings		218			218
Leasehold improvements		6,152			5,235
Furniture, fixtures and equipment		30,863			26,344
Vehicles and equipment		153,744			124,861

		191,043			156,724
Less: accumulated depreciation and amortization		(109,968	)		(88,936	)

	$	81,075		$	67,788

Schedule of Depreciation and Amortization Expense on Property and Equipment, by Income Statement Category

During the twelve months ended December 31, 2017 and 2016 we recorded the following depreciation and amortization expense on our property and equipment, by income statement category (in thousands):


	As of December 31,
	2017		2016		2015
Cost of sales	$	26,731	$	22,294	$	16,101
Administrative		1,554		1,276		874

Goodwill and Intangibles (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Change in Carrying Amount of Goodwill

The change in carrying amount of goodwill was as follows (in thousands):


	Goodwill (Gross)			Accumulated Impairment Losses			Goodwill (Net)
January 1, 2016	$	160,516		$	(70,004	)	$	90,512
Business combinations		16,918			—			16,918
Other		(344	)		—			(344	)

December 31, 2016		177,090			(70,004	)		107,086
Business combinations		47,727			—			47,727
Other		653			—			653

December 31, 2017	$	225,470		$	(70,004	)	$	155,466

Schedule of Gross Carrying Amount, Accumulated Amortization and Net Book Value

The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in thousands):


	As of December 31,
	2017						2016
	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Amortized intangibles:
Customer relationships	$	121,015	$	38,651	$	82,364	$	80,909	$	27,533	$	53,376
Covenants not-to-compete		11,807		4,773		7,034		8,602		2,466		6,136
Trademarks and tradenames		58,136		14,076		44,060		37,303		10,498		26,805
Backlog		13,600		9,067		4,533		—		—		—

	$	204,558	$	66,567	$	137,991	$	126,814	$	40,497	$	86,317

Schedule of Estimated Aggregate Annual Amortization

Remaining estimated aggregate annual amortization expense is as follows (in thousands):


2018	$	23,516
2019		18,387
2020		17,671
2021		16,653
2022		15,735
Thereafter		46,029

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Maturities of Debt

Long-term debt consisted of the following (in thousands):


	As of December 31,
	2017			2016
Term loans, in effect, net of unamortized debt issuance costs of $5,146 and $447, respectively	$	293,354		$	95,803
Delayed draw term loans, in effect, net of unamortized debt issuance costs of $0 and $50, respectively		—			12,450
Vehicle and equipment notes, maturing December 2022; payable in various monthly installments, including interest rates ranging from 2% to 4.5%		50,357			38,186
Various notes payable, maturing through March 2025; payable in various monthly installments, including interest rates ranging from 4% to 6%		3,866			4,988

		347,577			151,427
Less: current maturities		(16,650	)		(17,192	)

Long-term debt, less current maturities	$	330,927		$	134,235

Costs and Estimated Earnings on Uncompleted Contracts (Tables)

12 Months Ended

Dec. 31, 2017

Contractors [Abstract]

Schedule of Cost and Estimated Earnings on Uncompleted Contracts

Uncompleted contracts were as follows (in thousands):


	As of December 31, 2017
Costs incurred on uncompleted contracts	$	79,235
Estimated earnings		44,035

Total		123,270

Less: Billings to date		121,464

Net under (over) billings	$	1,806

Schedule of Net Under (Over) Billings

Net under (over) billings were as follows (in thousands):


	As of December 31, 2017
Costs and estimated earnings in excess of billings on uncompleted contracts	$	6,182
Billings in excess of costs and estimated earnings on uncompleted contracts		(4,376	)

Net under (over) billings	$	1,806

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Values of Financial Assets and Liabilities

The fair values of financial assets and liabilities not described above were as follows (in thousands):


	As of December 31, 2017
	Total		Level 1		Level 2		Level 3
Financial assets:
Cash equivalents	$	55,634	$	55,634	$	—	$	—
Investments		30,038		—		30,038		—
Derivative financial instruments, net of tax		618				618

Total financial assets	$	86,290	$	55,634	$	30,656	$	—

Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2017

Postemployment Benefits [Abstract]

Summary of Workers' Compensation Known Claims and IBNR Reserves

Workers’ compensation known claims and IBNR reserves included on the Consolidated Balance Sheets were as follows (in thousands):


	As of December 31,
	2017		2016
Included in other current liabilities	$	5,899	$	4,595
Included in other long-term liabilities		8,721		7,052

	$	14,620	$	11,647

Schedule of Insurance Receivable for Claims

This receivable offsets an equal liability included within the reserve amounts noted above and was as follows (in thousands):


	As of December 31,
	2017		2016
Included in other non-current assets	$	1,826	$	1,249

Summary of Equity-based Awards for Employees

Amounts for each category of equity-based award for employees as of December 31, 2017 and changes during the twelve months ended December 31, 2017 were as follows:


	Common Stock Awards					Performance-Based Stock Awards				Performance-Based Restricted Stock Units
	Awards			Weighted Average Fair Market Value Per Share		Awards		Weighted Average Fair Market Value Per Share		Units			Weighted Average Fair Market Value Per Share
Nonvested awards/units at December 31, 2016		161,174		$	26.36		—	$	—		—		$	—
Granted		101,241			52.00		77,254		41.00		74,818			52.16
Vested		(58,302	)		26.43		—		—		—			—
Forfeited/Cancelled		(1,782	)		35.07		—		—		(2,818	)		52.00

Nonvested awards/units at December 31, 2017		202,331		$	39.09		77,254	$	41.00		72,000		$	52.16

Summary of Stock Compensation Expenses

During the twelve months ended December 31, 2017 and 2016, we recorded the following stock compensation expense, by income statement category (in thousands):


	2017		2016
Cost of sales	$	965	$	—
Selling		571		—
Administrative		5,055		1,894

	$	6,591	$	1,894

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The provision for income taxes is comprised of (in thousands):


	Years ended December 31,
	2017			2016			2015
Current:
Federal	$	17,557		$	18,307		$	13,939
State		3,302			3,472			2,989

		20,859			21,779			16,928
Deferred:
Federal		(5,895	)		(338	)		(1,255	)
State		(284	)		(267	)		(260	)

		(6,179	)		(605	)		(1,515	)

Total tax expense	$	14,680		$	21,174		$	15,413

Reconciliation Between Effective Tax Rate on Net Income (Loss) and Federal Statutory Tax Rate

The reconciliation between our effective tax rate on net income and the federal statutory rate is as follows (dollars in thousands):


	Years ended December 31,
	2017					2016					2015
Income tax at federal statutory rate	$	19,537		35.0	%	$	20,864		35.0	%	$	14,676		35.0	%
Stock compensation		(581	)	(1.0	%)		(227	)	(0.4	%)		—		0.0	%
Qualified Production Activity Deduction		(1,715	)	(3.1	%)		(1,776	)	(3.0	%)		(1,347	)	(3.2	%)
Other permanent items		197		0.4	%		(92	)	(0.1	%)		(69	)	(0.2	%)
Change in valuation allowance		285		0.5	%		442		0.7	%		467		1.1	%
Change in uncertain tax positions		(1,807	)	(3.2	%)		66		0.1	%		(559	)	(1.3	%)
State income taxes, net of federal benefit		2,150		3.8	%		1,897		3.2	%		2,245		5.4	%
Rate impact of the Tax Act		(3,386	)	(6.1	%)		—		—	%		—		—	%

Total tax expense	$	14,680		26.3	%	$	21,174		35.5	%	$	15,413		36.8	%

Net Deferred Tax Asset or Liability

Components of the net deferred tax asset or liability are as follows (in thousands):


	As of December 31,
	2017			2016
Deferred Tax Assets
Long-term
Accrued reserves and allowances	$	3,916		$	1,866
Allowance for doubtful accounts		426			448
Inventories		213			284
Intangibles		3,279			806
Net operating loss carryforwards		2,623			2,921
Other current and long-term		10			2

Long-term deferred tax assets		10,467			6,327
Less: Valuation allowance		(1,746	)		(2,415	)

Net deferred tax assets		8,721			3,912
Deferred Tax Liabilities
Long-term
Accrued reserves and allowances		(308	)		(565	)
Property and equipment		(1,453	)		(1,505	)
Intangibles		(3,543	)		(4,899	)
Investment in partnership		(9,189	)		(9,530	)
Other		(208	)		(62	)

Long-term deferred tax liabilities		(14,701	)		(16,561	)

Net deferred tax liabilities	$	(5,980	)	$	(12,649	)

Rollforward of Gross Unrecognized Tax Benefits

A rollforward of the gross unrecognized tax benefits is as follows (in thousands):


Unrecognized tax benefit, January 1, 2016	$	3,586
Increase as a result of tax positions taken during the period		2,354
Decrease as a result of tax positions taken during the period		(1,356	)
Decrease as a result of expiring statutes		(487	)

Unrecognized tax benefit, December 31, 2016		4,097
Increase as a result of tax positions taken during the period		4,353
Decrease as a result of tax positions taken during the period		(2,311	)
Decrease as a result of expiring statutes		(1,689	)

Unrecognized tax benefit, December 31, 2017	$	4,450

Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Common or Related Party Transactions


	Years ended December 31,
	2017		2016		2015
Sales	$	10,250	$	7,914	$	6,720
Purchases		1,294		579		480
Rent		1,154		635		598

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Accrued General Insurance Reserves

Accrued general insurance reserves included on the Consolidated Balance Sheets were as follows (in thousands):


	As of December 31,
	2017		2016
Included in other current liabilities	$	2,033	$	1,949
Included in other long-term liabilities		7,073		7,104

	$	9,106	$	9,053

Schedule of Insurance Receivable for Claims


	As of December 31,
	2017		2016
Insurance receivable and indemnification asset for claims under a fully insured policy	$	2,773	$	2,773
Insurance receivable for claims that exceeded the stop loss limit		2		26

Total insurance receivables included in other non-current assets	$	2,775	$	2,799

Future Minimum Lease Payments Under Noncancellable Operating Leases


	Capital Leases			Operating Leases
				Related Party		Other		Total Operating
2018	$	6,287		$	950	$	12,304	$	13,254
2019		4,322			837		9,911		10,748
2020		1,688			574		6,775		7,349
2021		882			591		2,932		3,523
2022		25			609		1,795		2,404
Thereafter		—			—		2,523		2,523

		13,204		$	3,561	$	36,240	$	39,801

Less: Amounts representing executory costs		(326	)
Less: Amounts representing interest		(733	)

Total obligation under capital leases		12,145
Less: Current portion of capital leases		(5,666	)

Long term capital lease obligation	$	6,479

Future Minimum Capital Lease Payment


	Capital Leases			Operating Leases
				Related Party		Other		Total Operating
2018	$	6,287		$	950	$	12,304	$	13,254
2019		4,322			837		9,911		10,748
2020		1,688			574		6,775		7,349
2021		882			591		2,932		3,523
2022		25			609		1,795		2,404
Thereafter		—			—		2,523		2,523

		13,204		$	3,561	$	36,240	$	39,801

Less: Amounts representing executory costs		(326	)
Less: Amounts representing interest		(733	)

Total obligation under capital leases		12,145
Less: Current portion of capital leases		(5,666	)

Long term capital lease obligation	$	6,479

Total Rent Expense under Operating Leases


	Years ended December 31,
	2017		2016		2015
Cost of Sales	$	813	$	848	$	855
Administrative		14,310		10,732		8,507

Total	$	15,123	$	11,580	$	9,362

Business Combinations (Tables)

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Schedule of Business Combinations

As part of our ongoing strategy to expand geographically and increase market share in certain markets, we completed ten, nine and eight business combinations during the years ended December 31, 2017, 2016 and 2015, respectively, as well as insignificant tuck-in acquisitions merged into existing operations in 2017 and 2015, in which we acquired 100% of the voting equity interests in each acquired entity. Acquisition-related costs amounted to $3.9 million, $2.3 million and $1.1 million for the years ended December 31, 2017, 2016 and 2015, respectively, and are included in Administrative expenses on the Consolidated Statements of Operations and Comprehensive Income. The goodwill to be recognized in conjunction with these business combinations represents the excess cost of the acquired entity over the net amount assigned to assets acquired and liabilities assumed. We expect to deduct $47.6 million of goodwill for tax purposes as a result of 2017 acquisitions.

For the twelve months ended December 31, 2017 (in thousands):


Name	Date		Acquisition Type		Cash Paid		Seller Obligations		Fair Value of Common Stock Issued		Total Purchase Price		Revenue		Net Income (Loss)
Alpha (1)		1/5/2017		Share	$	103,810	$	2,002	$	10,859	$	116,671	$	116,070	$	(1,148	)
Columbia		6/26/2017		Asset		8,768		225		—		8,993		6,046		86
Astro		9/18/2017		Asset		9,144		482		—		9,626		1,829		11
Other		Various		Asset		15,645		2,419		—		18,064		20,457		573

Total					$	137,367	$	5,128	$	10,859	$	153,354	$	144,402	$	(478	)

(1)

For the twelve months ended December 31, 2016 (in thousands):


Name	Date		Acquisition Type		Cash Paid		Seller Obligations		Total Purchase Price		Revenue		Net Income (Loss)
Alpine Insulation Co., Inc.		4/12/2016		Asset	$	21,151	$	1,560	$	22,711	$	21,359	$	1,370
East Coast		10/17/2016		Asset		15,589		600		16,189		4,701		21
Other		Various		Asset		18,753		2,299		21,052		19,974		(592	)

Total					$	55,493	$	4,459	$	59,952	$	46,034	$	799

For the twelve months ended December 31, 2015 (in thousands):


Name	Date		Acquisition Type		Cash Paid		Seller Obligations		Total Purchase Price		Revenue		Net Income (Loss)
BDI		3/12/2015		Stock	$	30,680	$	5,765	$	36,445	$	32,505	$	2,023
CQ		4/6/2015		Stock		5,193		2,319		7,512		7,839		556
Layman		6/1/2015		Asset		9,088		600		9,688		8,211		516
Eastern		8/10/2015		Stock		24,199		2,875		27,074		7,368		312
Other		Various		Asset		16,040		1,621		17,661		6,349		(97	)

Total					$	85,200	$	13,180	$	98,380	$	62,272	$	3,310

Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed

The estimated fair values of the assets acquired and liabilities assumed for the acquisitions, as well as total purchase prices and cash paid, approximated the following (in thousands):


	2017
	Alpha			Columbia			Astro			Other			Total
Estimated fair values:
Cash	$	247		$	—		$	—		$	—		$	247
Accounts receivable		29,851			1,004			924			3,195			34,974
Inventories		1,852			704			296			1,544			4,396
Other current assets		4,500			8			36			96			4,640
Property and equipment		1,528			659			640			1,820			4,647
Intangibles		57,200			4,760			5,168			9,688			76,816
Goodwill		38,511			2,184			2,926			4,106			47,727
Other non-current assets		383			32			—			234			649
Accounts payable and other current liabilities		(17,401	)		(358	)		(364	)		(2,619	)		(20,742	)

Fair value of assets acquired		116,671			8,993			9,626			18,064			153,354
Less fair value of common stock issued		10,859			—			—			—			10,859
Less seller obligations		2,002			225			482			2,419			5,128

Cash paid	$	103,810		$	8,768		$	9,144		$	15,645		$	137,367


	2016
	Alpine			East Coast			Other			Total
Estimated fair values:
Cash	$	—		$	2,181		$	—		$	2,181
Accounts receivable		3,959			3,093			2,502			9,554
Inventories		700			332			1,183			2,215
Other current assets		—			1			24			25
Property and equipment		656			666			1,616			2,938
Intangibles		12,800			6,400			11,067			30,267
Goodwill		6,642			4,346			5,933			16,921
Other non-current assets		—			116			345			461
Accounts payable and other current liabilities		(2,046	)		(946	)		(1,618	)		(4,610	)

Fair value of assets acquired		22,711			16,189			21,052			59,952
Less seller obligations		1,560			600			2,299			4,459

Cash paid	$	21,151		$	15,589		$	18,753		$	55,493


	2015
	BDI			CQ			Layman			Eastern			Other			Total
Estimated fair values:
Cash	$	661		$	100		$	—		$	165		$	—		$	926
Accounts receivable		4,735			1,423			1,245			2,768			4,093			14,264
Inventories		980			152			267			335			720			2,454
Other current assets		368			39			—			109			32			548
Property and equipment		1,006			190			733			1,364			1,574			4,867
Intangibles		21,280			4,350			5,330			13,871			10,534			55,365
Goodwill		16,213			3,035			3,143			9,904			4,809			37,104
Other non-current assets		3,736			—			—			322			60			4,118
Accounts payable and other current liabilities		(3,303	)		(1,539	)		(1,030	)		(1,681	)		(2,220	)		(9,773	)
Deferred income tax liabilities		(5,495	)		—			—			—			(825	)		(6,320	)
Long-term debt		—			—			—			(82	)		—			(82	)
Other long-term liabilities		(3,736	)		(238	)		—			(1	)		—			(3,975	)

Fair value of assets acquired		36,445			7,512			9,688			27,074			18,777			99,496
Gain on bargain purchase		—			—			—			—			(1,116	)		(1,116	)

Total purchase price		36,445			7,512			9,688			27,074			17,661			98,380
Less seller obligations		5,765			2,319			600			2,875			1,621			13,180

Cash paid	$	30,680		$	5,193		$	9,088		$	24,199		$	16,040		$	85,200

Estimates of Acquired Intangible Assets

Estimates of acquired intangible assets related to the acquisitions are as follows (dollars in thousands):


	2017				2016				2015
Acquired intangibles assets	Estimated Fair Value		Weighted Average Estimated Useful Life (yrs)		Estimated Fair Value		Weighted Average Estimated Useful Life (yrs)		Estimated Fair Value		Weighted Average Estimated Useful Life (yrs)
Customer relationships	$	39,922		8	$	18,511		9	$	36,129		8
Trademarks and trade names		20,667		15		8,983		15		14,567		15
Non-competition agreements		2,628		5		2,773		5		4,668		5
Backlog		13,600		1.5		—		—		—		—

Pro Forma Results of Operations


	Unaudited Pro Forma for the years ended December 31,
	2017		2016		2015
Net revenue	$	1,169,061	$	1,058,707	$	786,144
Net income		43,179		43,891		29,463
Basic and diluted net income per share		1.36		1.39		0.94

Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Quarterly Financial Data

Summarized unaudited quarterly financial results for 2017 and 2016 is as follows (in thousands, except per share data):


2017	Three months ended
	March 31		June 30		September 30		December 31		Total Year
Net revenue	$	255,669	$	282,196	$	295,193	$	299,869	$	1,132,927
Gross profit		72,172		84,928		85,581		81,345		324,026
Net income		6,364		11,973		12,010		10,793		41,140
Comprehensive income		6,364		11,896		12,042		11,345		41,647
Basic and diluted net income per share		0.20		0.38		0.38		0.34		1.30


2016	Three months ended
	March 31		June 30		September 30		December 31		Total Year
Net revenue	$	191,698	$	211,913	$	225,392	$	233,977	$	862,980
Gross profit		54,591		62,243		67,260		68,354		252,448
Net income		5,813		9,993		11,549		11,081		38,436
Comprehensive income		5,813		9,993		11,549		11,081		38,436
Basic and diluted net income per share		0.19		0.32		0.37		0.35		1.23

Organization - Additional Information (Detail)	12 Months Ended
Organization - Additional Information (Detail)	Dec. 31, 2017 Location Segment	Dec. 31, 2016	Dec. 31, 2015
Basis Of Presentation And Organization [Line Items]
Number of operating segment \| Segment	1
Revenue [Member] \| Customer Concentration Risk [Member]
Basis Of Presentation And Organization [Line Items]
Net revenues percentage	100.00%	100.00%	100.00%
Revenue [Member] \| Customer Concentration Risk [Member] \| Residential New Construction and Repair and Remodel [Member]
Basis Of Presentation And Organization [Line Items]
Net revenues percentage	83.00%	88.00%	89.00%
Revenue [Member] \| Customer Concentration Risk [Member] \| Commercial New Construction and Repair and Remodel [Member]
Basis Of Presentation And Organization [Line Items]
Net revenues percentage	17.00%	12.00%	11.00%
United States [Member]
Basis Of Presentation And Organization [Line Items]
Number of locations the company operates \| Location	125

Organization - Summary of Annual Percentage of Installation Net Revenue by Product Category (Detail) - Customer Concentration Risk [Member] - Revenue [Member]	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Net revenues percentage	100.00%	100.00%	100.00%
Insulation [Member]
Concentration Risk [Line Items]
Net revenues percentage	67.00%	77.00%	78.00%
Waterproofing [Member]
Concentration Risk [Line Items]
Net revenues percentage	8.00%	2.00%	2.00%
Shower doors, shelving and mirrors [Member]
Concentration Risk [Line Items]
Net revenues percentage	7.00%	5.00%	5.00%
Garage doors [Member]
Concentration Risk [Line Items]
Net revenues percentage	5.00%	6.00%	6.00%
Rain gutters [Member]
Concentration Risk [Line Items]
Net revenues percentage	4.00%	4.00%	5.00%
Other building products [Member]
Concentration Risk [Line Items]
Net revenues percentage	9.00%	6.00%	4.00%

Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies and General Information [Line Items]
Amount insured by FDIC		$ 250,000
Cash equivalents		55,600,000	$ 0
Impairment of long-lived assets		0	0	$ 0
Insurance cost of claims		14,620,000	11,647,000
Advertising expenses		3,200,000	3,000,000	2,300,000
Amortization expense related to financing costs		1,100,000	400,000	$ 300,000
Deferred financing costs		6,800,000	1,700,000
Write-off of debt issuance costs, included in interest expense		$ 2,113,000	$ 286,000
Federal corporate tax rate		35.00%	35.00%	35.00%
Tax benefit recognized, due to tax rate change		$ 3,800,000
Result of ASU implementation		3,000,000
Other Non-Current Assets [Member]
Accounting Policies and General Information [Line Items]
Retainage receivables, expected to be collected		$ 500,000
Scenario, Forecast [Member]
Accounting Policies and General Information [Line Items]
Federal corporate tax rate	21.00%
Maximum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life		6 years
Minimum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life		4 years
Customer Relationships [Member] \| Maximum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life			15 years
Customer Relationships [Member] \| Minimum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life			8 years
Covenants Not-to-Compete [Member] \| Maximum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life			5 years
Covenants Not-to-Compete [Member] \| Minimum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life			1 year
Trademarks and Trade Names [Member] \| Maximum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life			15 years
Trademarks and Trade Names [Member] \| Minimum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life			8 years
Vehicles [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life, description		The shorter of lease life or five years
Furniture, Fixtures and Equipment[Member] \| Maximum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life		5 years
Furniture, Fixtures and Equipment[Member] \| Minimum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life		3 years
Equipment [Member] \| Maximum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life		5 years
Equipment [Member] \| Minimum [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life		3 years
Leasehold Improvements [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life, description		The shorter of lease life or five years
Building [Member]
Accounting Policies and General Information [Line Items]
Estimated useful life		30 years
Revenue [Member] \| Customer Concentration Risk [Member]
Accounting Policies and General Information [Line Items]
Customer concentration risk, percentage		100.00%	100.00%	100.00%
Revenue [Member] \| Customer Concentration Risk [Member] \| Maximum [Member]
Accounting Policies and General Information [Line Items]
Customer concentration risk, percentage		4.00%	4.00%	4.00%
Accounts Receivable [Member]
Accounting Policies and General Information [Line Items]
Retainage receivables		$ 23,100,000	$ 10,300,000
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Maximum [Member]
Accounting Policies and General Information [Line Items]
Customer concentration risk, percentage		3.00%	3.00%	3.00%
Workers' Compensation Insurance [Member]
Accounting Policies and General Information [Line Items]
Insurance cost of claims		$ 800,000	$ 800,000
General Liability Insurance Program [Member] \| Maximum [Member]
Accounting Policies and General Information [Line Items]
Insurance cost of claims		2,000,000	2,000,000
Aggregate cap of insurance cost of claims		8,000,000	8,000,000
Self-incurred retention		400,000	400,000
Credit and Security Agreement [Member]
Accounting Policies and General Information [Line Items]
Deferred financing costs		1,000,000	$ 300,000
Write-off of debt issuance costs, included in interest expense		$ 2,100,000

Significant Accounting Policies - Allowance for Doubtful Accounts Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance	$ 3,397	$ 2,486	$ 2,661
Charged to costs and expenses	2,834	2,928	919
Charged to other accounts	699	435	533
Deductions	(2,125)	(2,452)	(1,627)
Ending Balance	$ 4,805	$ 3,397	$ 2,486

Investments - Additional Information (Detail) - USD ($)	12 Months Ended
Investments - Additional Information (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 62,510,000	$ 14,482,000	$ 6,818,000	$ 10,761,000
Investments	30,053,000
Held-to-Maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investments	$ 30,100,000	0
Investment maturity	One year or less
Money Market Funds [Member] \| Level 1 [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and cash equivalents	$ 55,600,000	$ 0.0

Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	$ 191,043	$ 156,724
Less: accumulated depreciation and amortization	(109,968)	(88,936)
Property Plant And Equipment Net	81,075	67,788
Land [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	66	66
Building [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	218	218
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	6,152	5,235
Furniture, Fixtures and Equipment[Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	30,863	26,344
Vehicles and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Gross	$ 153,744	$ 124,861

Property Plant and Equipment - Schedule of Depreciation and Amortization Expense on Property and Equipment, by Income Statement Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 28,285	$ 23,571	$ 16,975
Cost of Sales [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	26,731	22,294	16,101
Administrative [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 1,554	$ 1,276	$ 874

Property and Equipment - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Property and equipment fully depreciated	$ 49.7	$ 42.7

Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill (Gross), beginning balance	$ 177,090	$ 160,516
Business combinations	47,727	16,918
Other	653	(344)
Goodwill (Gross), ending balance	225,470	177,090
Accumulated Impairment Losses, beginning balance	(70,004)	(70,004)
Accumulated Impairment Losses, ending balance	(70,004)	(70,004)
Goodwill (Net), beginning balance	107,086	90,512
Business combinations	47,727	16,918
Other	653	(344)
Goodwill (Net), ending balance	$ 155,466	$ 107,086

Goodwill and Intangibles - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0	$ 0	$ 0
Intangible asset impairment	0	0	0
Increase in gross carrying amount of intangibles	77,700,000	30,400,000
Amortization expense on intangible assets	26,857,000	11,259,000	$ 6,264,000
Intangibles on business combination	$ 76,800,000	$ 30,300,000

Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 204,558	$ 126,814
Accumulated Amortization	66,567	40,497
Net Book Value	137,991	86,317
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	121,015	80,909
Accumulated Amortization	38,651	27,533
Net Book Value	82,364	53,376
Covenants Not-to-Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,807	8,602
Accumulated Amortization	4,773	2,466
Net Book Value	7,034	6,136
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	58,136	37,303
Accumulated Amortization	14,076	10,498
Net Book Value	44,060	$ 26,805
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,600
Accumulated Amortization	9,067
Net Book Value	$ 4,533

Goodwill and Intangibles - Schedule of Estimated Aggregate Annual Amortization (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Finite Lived Intangible Assets Net Amortization Expense Rolling Maturity [Abstract]
2018	$ 23,516
2019	18,387
2020	17,671
2021	16,653
2022	15,735
Thereafter	$ 46,029

Long-term Debt - Schedule of Maturities of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Term loans, in effect, net of unamortized debt issuance costs of $5,146 and $447, respectively	$ 293,354	$ 95,803
Delayed draw term loans, in effect, net of unamortized debt issuance costs of $0 and $50, respectively		12,450
Vehicle and equipment notes, maturing December 2022; payable in various monthly installments, including interest rates ranging from 2% to 4.5%	50,357	38,186
Various notes payable, maturing through March 2025; payable in various monthly installments, including interest rates ranging from 4% to 6%	3,866	4,988
Total long term debt	347,577	151,427
Total long term debt	347,577	151,427
Less: current maturities	(16,650)	(17,192)
Long-term debt, less current maturities	$ 330,927	$ 134,235

Long-term Debt - Schedule of Maturities of Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Notes payable maturity date	2025-03
Minimum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	4.00%
Maximum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	6.00%
Term Loan Agreement [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 5,146	$ 447
Delayed Draw [Member]
Debt Instrument [Line Items]
Unamortized issue discount and debt issuance costs	$ 0	$ 50
Vehicle and Equipment [Member]
Debt Instrument [Line Items]
Notes payable maturity date	2022-12
Vehicle and Equipment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	2.00%
Vehicle and Equipment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Notes payable Interest rate	4.50%

Long-term Debt - Additional Information (Detail) - USD ($)			12 Months Ended
	Nov. 30, 2017	Apr. 13, 2017	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Assets relating to master loan agreements, Gross			$ 63,400,000	$ 64,200,000
Capital leased assets, net book value			$ 13,000,000	16,400,000
Master Loan Agreements [Member]
Debt Instrument [Line Items]
Payment Period, typical			60 months
Assets relating to master loan agreements, Gross			$ 74,500,000	48,700,000
Capital leased assets, net book value			51,400,000	$ 38,000,000
US Bank Master Loan Agreement [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 100,000,000
Term loan facility maturity period	60 months
Loan amount available under agreement			100,000,000
Term Loan Agreement [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Margin interest rate percentage		2.50%
Term Loan Agreement [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Margin interest rate percentage		1.50%
Term Loan Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 300,000,000
Term loan facility maturity period		7 years
Quarterly principal payment of term loan			$ 800,000
Credit facility, amortization description			The Term Loan amortizes in quarterly principal payments of approximately $0.8 million, with any remaining unpaid balances due on April 15, 2024, which is the maturity date. Loans incurred under the ABL Revolver will have a final maturity of April 13, 2022.
Percentage of mandatory pre-payments on debt issuance			100.00%
Percentage of mandatory pre-payments on sale or disposition of assets			100.00%
Percentage of mandatory pre-payments on excess cash flow			50.00%
Excess cash flow limit for mandatory pre-payments of debt			$ 5,000,000
Term Loan Agreement [Member] \| Term Loan [Member] \| Leverage Ratio Range One [Member]
Debt Instrument [Line Items]
Percentage of mandatory pre-payments on excess cash flow			25.00%
Term Loan Agreement [Member] \| Term Loan [Member] \| Leverage Ratio Range Two [Member]
Debt Instrument [Line Items]
Percentage of mandatory pre-payments on excess cash flow			0.00%
ABL Credit Agreement [Member]
Debt Instrument [Line Items]
Fixed coverage ratio, covenants requirements		1.00%
ABL Credit Agreement [Member] \| Eurodollar Rate Loan One [Member]
Debt Instrument [Line Items]
Margin interest rate percentage		1.25%
ABL Credit Agreement [Member] \| Eurodollar Rate Loan Two [Member]
Debt Instrument [Line Items]
Margin interest rate percentage		1.50%
ABL Credit Agreement [Member] \| Eurodollar Rate Loan Three [Member]
Debt Instrument [Line Items]
Margin interest rate percentage		1.75%
ABL Credit Agreement [Member] \| Base Rate Loan One [Member]
Debt Instrument [Line Items]
Margin interest rate percentage		0.25%
ABL Credit Agreement [Member] \| Base Rate Loan Two [Member]
Debt Instrument [Line Items]
Margin interest rate percentage		0.50%
ABL Credit Agreement [Member] \| Base Rate Loan Three [Member]
Debt Instrument [Line Items]
Margin interest rate percentage		0.75%
ABL Credit Agreement [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity		$ 100,000,000
Maturity date			Apr. 13, 2022
ABL Credit Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity		$ 50,000,000
Amended Term Loan Agreement [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 299,300,000

Costs and Estimated Earnings on Uncompleted Contracts - Schedule of Cost and Estimated Earnings on Uncompleted Contracts (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 79,235
Estimated earnings	44,035
Total	123,270
Less: Billings to date	121,464
Net under (over) billings	$ 1,806

Costs and Estimated Earnings on Uncompleted Contracts - Schedule of Net Under (Over) Billings (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Contractors [Abstract]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 6,182
Billings in excess of costs and estimated earnings on uncompleted contracts	(4,376)
Net under (over) billings	$ 1,806

Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Financial assets:
Cash equivalents	$ 55,634
Investments	30,038
Derivative financial instruments, net of tax	618
Total financial assets	86,290
Level 1 [Member]
Financial assets:
Cash equivalents	55,634
Total financial assets	55,634
Level 2 [Member]
Financial assets:
Investments	30,038
Derivative financial instruments, net of tax	618
Total financial assets	$ 30,656

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Fair Value Measurements - Additional Information (Detail)	Dec. 31, 2016 USD ($)
Fair Value Disclosures [Abstract]
Fair value of asset (liability)	$ 0

Derivative and Hedging Activities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) Instruments
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Ineffectiveness recognized for fair value hedge		$ 100,000
Scenario, Forecast [Member] \| Interest Expense [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Reclassification from accumulated other comprehensive income to interest expense	$ 200,000
Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivative instruments		$ 100,000,000
Derivatives, number of instruments held \| Instruments		2
Notional amount amortized		$ 95,300,000
Notional amount maturity date		May 31, 2022

Stockholder's Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended	12 Months Ended
	Mar. 13, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2015
Statement Of Shareholders Equity [Line Items]
Effective portion of unrealized gain on derivative instruments			$ 507
Share repurchase, amount				$ 6,100
IBS [Member]
Statement Of Shareholders Equity [Line Items]
Common Stock Repurchase, Shares	315	315
Share repurchase, amount		$ 6,100
Share repurchase, price per share	$ 19.23
Discount from last reported price of our common stock	7.50%

Employee Benefits - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Installment $ / shares shares	Dec. 31, 2016 USD ($) Installment $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2017 shares
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Healthcare benefit expense, net of employee contributions	$ 17,400	$ 15,200	$ 11,800
Accrued compensation	25,399	18,212
Administration expense related to employee contribution plan	1,600	1,300	800
Share-based compensation expense	6,591	1,894
Unrecognized compensation expense	$ 5,500
Compensation cost not yet recognized, period for recognition	2 years
Cost of Sales [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Workers' compensation expense	$ 13,500	12,100	$ 12,000
Share-based compensation expense	965
Administrative [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 5,055	$ 1,894
Performance Based Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares \| shares	77,254
Grant date fair value for restricted stock granted \| $ / shares	$ 0
Share-based compensation expense	$ 900
Unrecognized compensation expense	$ 1,700
Compensation cost not yet recognized, period for recognition	1 year 10 months 25 days
Performance Based Restricted Stock Units [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares \| shares	74,818
Grant date fair value for restricted stock granted \| $ / shares	$ 0
Share-based compensation expense	$ 2,600
Unrecognized compensation expense	$ 1,100
Compensation cost not yet recognized, period for recognition	3 months 19 days
Performance Based Restricted Stock Awards [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 100
Compensation cost not yet recognized, period for recognition	4 years
Directors [Member] \| Restricted Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares \| shares	6,000	9,000	13,000
Grant date fair value for restricted stock granted \| $ / shares	$ 50.50	$ 34.23	$ 22.74
Share-based compensation expense	$ 300	$ 300	$ 300
2014 Omnibus Incentive Plan [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Number of shares surrendered to satisfy tax withholding obligations \| shares	11,000
Share based compensation, recognized tax benefits	$ 600	300
Common stock shares available for issuance \| shares				2,600,000
2014 Omnibus Incentive Plan [Member] \| Common Stock Awards [Member] \| Administrative [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Share-based compensation expense	$ 2,700	$ 1,600
2014 Omnibus Incentive Plan [Member] \| Restricted Stock [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Restricted stock granted, shares \| shares	100,000	100,000
Number of equal installments for restricted stock \| Installment	3	3
Medical IBNR Included in Accrued Compensation [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Accrued compensation	$ 1,800	$ 1,700

Employee Benefits - Summary of Workers' Compensation Known Claims and IBNR Reserves (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Employee-related Liabilities [Abstract]
Included in other current liabilities	$ 5,899	$ 4,595
Included in other long-term liabilities	8,721	7,052
Workers' Compensation Liability	$ 14,620	$ 11,647

Employee Benefits - Schedule of Insurance Receivable for Claims (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Workers' Compensation [Member]
Malpractice Insurance [Line Items]
Included in other non-current assets	$ 1,826	$ 1,249

Employee Benefits - Summary of Equity-Based Awards for Employees (Detail)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Common Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested common stock awards, Beginning balance \| shares	161,174
Granted \| shares	101,241
Vested \| shares	(58,302)
Forfeited/Cancelled \| shares	(1,782)
Nonvested common stock awards, Ending balance \| shares	202,331
Nonvested performance-based stock awards, Beginning balance	$ 26.36
Granted	52.00
Vested	26.43
Forfeited/Cancelled	35.07
Nonvested performance-based stock awards, Ending balance	$ 39.09
Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted \| shares	77,254
Vested \| shares	0
Nonvested performance-based stock awards/units, Ending balance \| shares	77,254
Nonvested performance-based stock awards/units, Beginning balance	$ 0
Granted	41.00
Vested	0
Nonvested performance-based stock awards/units, Ending balance	$ 41.00
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted \| shares	74,818
Vested \| shares	0
Forfeited/Cancelled \| shares	(2,818)
Nonvested performance-based stock awards/units, Ending balance \| shares	72,000
Nonvested performance-based stock awards/units, Beginning balance	$ 0
Granted	52.16
Vested	0
Forfeited/Cancelled	52.00
Nonvested performance-based stock awards/units, Ending balance	$ 52.16

Employee Benefits - Summary of Stock Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 6,591	$ 1,894
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	965
Selling [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	571
Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	$ 5,055	$ 1,894

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 17,557	$ 18,307	$ 13,939
State	3,302	3,472	2,989
Current Income Tax Expense (Benefit), Total	20,859	21,779	16,928
Deferred:
Federal	(5,895)	(338)	(1,255)
State	(284)	(267)	(260)
Deferred Income Tax Expense (Benefit), Total	(6,179)	(605)	(1,515)
Total tax expense	$ 14,680	$ 21,174	$ 15,413

Income Taxes - Reconciliation of Effective Tax Rate on Net Income (Loss) and Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 19,537	$ 20,864	$ 14,676
Stock compensation	(581)	(227)
Qualified Production Activity Deduction	(1,715)	(1,776)	(1,347)
Other permanent items	197	(92)	(69)
Change in valuation allowance	285	442	467
Change in uncertain tax positions	(1,807)	66	(559)
State income taxes, net of federal benefit	2,150	1,897	2,245
Rate impact of the Tax Act	(3,386)
Total tax expense	$ 14,680	$ 21,174	$ 15,413
Income tax at federal statutory rate	35.00%	35.00%	35.00%
Stock compensation	(1.00%)	(0.40%)	(0.00%)
Qualified Production Activity Deduction	(3.10%)	(3.00%)	(3.20%)
Other permanent items	0.40%	(0.10%)	(0.20%)
Change in valuation allowance	0.50%	0.70%	1.10%
Change in uncertain tax positions	(3.20%)	0.10%	(1.30%)
State income taxes, net of federal benefit	3.80%	3.20%	5.40%
Rate impact of the Tax Act	(6.10%)
Total tax expense	26.30%	35.50%	36.80%

Income Taxes - Components of Net Deferred Tax Asset or Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets
Accrued reserves and allowances	$ 3,916	$ 1,866
Allowance for doubtful accounts	426	448
Inventories	213	284
Intangibles	3,279	806
Net operating loss carryforwards	2,623	2,921
Other current and long-term	10	2
Long-term deferred tax assets	10,467	6,327
Less: Valuation allowance	(1,746)	(2,415)
Net deferred tax assets	8,721	3,912
Deferred Tax Liabilities
Accrued reserves and allowances	(308)	(565)
Property and equipment	(1,453)	(1,505)
Intangibles	(3,543)	(4,899)
Investment in partnership	(9,189)	(9,530)
Other	(208)	(62)
Long-term deferred tax liabilities	(14,701)	(16,561)
Net deferred tax liabilities	$ (5,980)	$ (12,649)

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Deferred tax assets, net operating loss carryforwards		$ 2,623,000	$ 2,921,000
Benefit of net operating loss carryforwards		10,600,000
Unrecognized tax benefit that would affect the effective tax rate		1,500,000
Uncertain tax positions, interest expense and penalties accrued		$ 100,000
Federal corporate tax rate		35.00%	35.00%	35.00%
Decrease in total income tax expense (benefit), due to tax rate change		$ (3,386,000)
Tax benefit recognized, due to tax rate change		3,800,000
Tax expense offset amount		400,000
Scenario, Forecast [Member]
Income Taxes [Line Items]
Federal corporate tax rate	21.00%
Minimum [Member]
Income Taxes [Line Items]
Decrease in unrecognized tax benefits, net of penalties and interest		0
Maximum [Member]
Income Taxes [Line Items]
Decrease in unrecognized tax benefits, net of penalties and interest		$ 1,100,000

Income Taxes - Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefit beginning balance	$ 4,097	$ 3,586
Increase as a result of tax positions taken during the period	4,353	2,354
Decrease as a result of tax positions taken during the period	(2,311)	(1,356)
Decrease as a result of expiring statutes	(1,689)	(487)
Unrecognized tax benefit ending balance	$ 4,450	$ 4,097

Related Party Transactions - Schedule of Related Party Transactions (Detail) - Affiliated Entity [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Sales	$ 10,250	$ 7,914	$ 6,720
Purchases	1,294	579	480
Rent	$ 1,154	$ 635	$ 598

Related Party Transactions - Additional Information (Detail) - USD ($) shares in Thousands, $ in Millions		1 Months Ended
	Mar. 13, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Accounts receivable, related parties			$ 2.0	$ 1.5
M/I Homes Inc [Member]
Related Party Transaction [Line Items]
Accounts receivable, related parties			$ 1.0	$ 0.8
IBS [Member]
Related Party Transaction [Line Items]
Common Stock Repurchase, Shares	315	315

Commitments and Contingencies - Schedule of Accrued General Insurance Reserves (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Included in other current liabilities	$ 2,033	$ 1,949
Included in other long-term liabilities	7,073	7,104
Total	$ 9,106	$ 9,053

Commitments and Contingencies - Schedule of Insurance Receivable for Claims (Detail) - General Liability [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments And Contingencies Disclosure [Line Items]
Insurance receivable and indemnification asset for claims under a fully insured policy	$ 2,773	$ 2,773
Insurance receivable for claims that exceeded the stop loss limit	2	26
Total insurance receivables included in other non-current assets	$ 2,775	$ 2,799

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Line Items]
Capital lease assets	$ 63,400	$ 64,200
Assets fully depreciated	26,800	22,800
Capital leased assets, net book value	13,000	16,400
Rent expense under operating leases	$ 15,123	$ 11,580	$ 9,362
Minimum [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated life of capital lease	4 years
Noncancellable operating leases, renewal period	1 year
Maximum [Member]
Commitments And Contingencies Disclosure [Line Items]
Estimated life of capital lease	6 years
Noncancellable operating leases, renewal period	5 years

Commitments and Contingencies - Future Minimum Lease Payments Under Noncancellable Operating Leases and Capital Lease (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Future Minimum Payments Under Non Cancelable Operating Leases With Initial Or Remaining Lease Terms In Excess Of One Year And Future Minimum Capital Lease Payments [Line Items]
2018	$ 6,287
2019	4,322
2020	1,688
2021	882
2022	25
Thereafter	0
Capital Leases, Future Minimum Payments, Net Minimum Payments, Total	13,204
Less: Amounts representing executory costs	(326)
Less: Amounts representing interest	(733)
Total obligation under capital leases	12,145
Total obligation under capital leases	12,145
Less: Current portion of capital leases	(5,666)	$ (6,929)
Long term capital lease obligation	6,479	$ 8,364
2018	13,254
2019	10,748
2020	7,349
2021	3,523
2022	2,404
Thereafter	2,523
Operating Leases, Future Minimum Payments Due, Total	39,801
Related Party Operating Lease [Member]
Future Minimum Payments Under Non Cancelable Operating Leases With Initial Or Remaining Lease Terms In Excess Of One Year And Future Minimum Capital Lease Payments [Line Items]
2018	950
2019	837
2020	574
2021	591
2022	609
Operating Leases, Future Minimum Payments Due, Total	3,561
Other Operating Leases [Member]
Future Minimum Payments Under Non Cancelable Operating Leases With Initial Or Remaining Lease Terms In Excess Of One Year And Future Minimum Capital Lease Payments [Line Items]
2018	12,304
2019	9,911
2020	6,775
2021	2,932
2022	1,795
Thereafter	2,523
Operating Leases, Future Minimum Payments Due, Total	$ 36,240

Commitments and Contingencies - Total Rent Expense under Operating Lease (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Leased Assets [Line Items]
Rent expense under operating leases	$ 15,123	$ 11,580	$ 9,362
Cost of Sales [Member]
Operating Leased Assets [Line Items]
Rent expense under operating leases	813	848	855
Administrative [Member]
Operating Leased Assets [Line Items]
Rent expense under operating leases	$ 14,310	$ 10,732	$ 8,507

Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Percentage of voting equity interests acquired	100.00%
Goodwill acquired expected to be tax deductible	$ 47,200
Total Purchase Price	153,354	$ 59,952	$ 98,380
Gain on bargain purchase			1,116
Amortization of intangibles	26,857	11,259	6,264
Income tax expense (benefit)	14,680	21,174	15,413
Interest expense	17,381	6,177	3,738
Administrative [Member]
Business Acquisition [Line Items]
Acquisition-related costs	3,900	2,300	1,100
Alpha [Member]
Business Acquisition [Line Items]
Increase in goodwill	2,100
Fair value of assets acquired	116,671
Total Purchase Price	116,671
Columbia [Member]
Business Acquisition [Line Items]
Increase in goodwill	500
Increase in seller obligations	400
Increase in purchase price	600
Fair value of assets acquired	8,993
Total Purchase Price	8,993
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Fair value of assets acquired	153,354	59,952	99,496
Gain on bargain purchase			1,116
Amortization of intangibles	1,300	17,500	6,600
Income tax expense (benefit)	700	3,000	1,700
Interest expense		$ 1,800
Business Combination Included as "Other" [Member]
Business Acquisition [Line Items]
Fair value of assets acquired			4,800
Total Purchase Price			3,700
Gain on bargain purchase			1,100
BDI Insulation [Member]
Business Acquisition [Line Items]
Fair value of assets acquired			36,445
Total Purchase Price			36,445
Insurance receivable for claims under a fully insured policy			2,000
Indemnification asset associated with the acquisition	$ 900		$ 1,700

Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Cash paid									$ 137,367	$ 55,493	$ 85,200
Seller Obligations	$ 5,128				$ 4,459				5,128	4,459	13,180
Fair Value of Common Stock Issued	10,859								10,859
Total Purchase Price									153,354	59,952	98,380
Revenue	299,869	$ 295,193	$ 282,196	$ 255,669	233,977	$ 225,392	$ 211,913	$ 191,698	1,132,927	862,980	662,719
Net Income (Loss)	10,793	$ 12,010	$ 11,973	$ 6,364	11,081	$ 11,549	$ 9,993	$ 5,813	$ 41,140	$ 38,436	$ 26,517
Alpha [Member]
Business Acquisition [Line Items]
Date									Jan. 05, 2017
Acquisition Type									Share
Cash paid									$ 103,810
Seller Obligations	2,002								2,002
Fair Value of Common Stock Issued	10,859								10,859
Total Purchase Price									116,671
Revenue									116,070
Net Income (Loss)									$ (1,148)
Columbia [Member]
Business Acquisition [Line Items]
Date									Jun. 26, 2017
Acquisition Type									Asset
Cash paid									$ 8,768
Seller Obligations	225								225
Total Purchase Price									8,993
Revenue									6,046
Net Income (Loss)									$ 86
Astro [Member]
Business Acquisition [Line Items]
Date									Sep. 18, 2017
Acquisition Type									Asset
Cash paid									$ 9,144
Seller Obligations	482								482
Total Purchase Price									9,626
Revenue									1,829
Net Income (Loss)									$ 11
Other Acquisition [Member]
Business Acquisition [Line Items]
Acquisition Type									Asset	Asset	Asset
Cash paid									$ 15,645	$ 18,753	$ 16,040
Seller Obligations	$ 2,419				2,299				2,419	2,299	1,621
Total Purchase Price									18,064	21,052	17,661
Revenue									20,457	19,974	6,349
Net Income (Loss)									573	$ (592)	$ (97)
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue									144,402
Net Income (Loss)									$ (478)
Alpine Insulation Co Inc [Member]
Business Acquisition [Line Items]
Date										Apr. 12, 2016
Acquisition Type										Asset
Cash paid										$ 21,151
Seller Obligations					1,560					1,560
Total Purchase Price										22,711
Revenue										21,359
Net Income (Loss)										$ 1,370
East Coast Insulators II, L.L.C [Member]
Business Acquisition [Line Items]
Date										Oct. 17, 2016
Acquisition Type										Asset
Cash paid										$ 15,589
Seller Obligations					$ 600					600
Total Purchase Price										16,189
Revenue										4,701
Net Income (Loss)										21
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue										46,034
Net Income (Loss)										$ 799
BDI Insulation [Member]
Business Acquisition [Line Items]
Date											Mar. 12, 2015
Acquisition Type											Stock
Cash paid											$ 30,680
Seller Obligations											5,765
Total Purchase Price											36,445
Revenue											32,505
Net Income (Loss)											$ 2,023
CQ Insulation [Member]
Business Acquisition [Line Items]
Date											Apr. 06, 2015
Acquisition Type											Stock
Cash paid											$ 5,193
Seller Obligations											2,319
Total Purchase Price											7,512
Revenue											7,839
Net Income (Loss)											$ 556
Layman Brothers Contracting [Member]
Business Acquisition [Line Items]
Date											Jun. 01, 2015
Acquisition Type											Asset
Cash paid											$ 9,088
Seller Obligations											600
Total Purchase Price											9,688
Revenue											8,211
Net Income (Loss)											$ 516
Eastern Contractor Services [Member]
Business Acquisition [Line Items]
Date											Aug. 10, 2015
Acquisition Type											Stock
Cash paid											$ 24,199
Seller Obligations											2,875
Total Purchase Price											27,074
Revenue											7,368
Net Income (Loss)											312
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue											62,272
Net Income (Loss)											$ 3,310

Business Combinations - Summary of Business Acquisitions (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) shares
Business Acquisition [Line Items]
Purchase consideration, value of shares issued	$ 10,859
Alpha [Member]
Business Acquisition [Line Items]
Business combination contingencies amount recognized	$ 21,700
Purchase consideration, number of shares issued \| shares	282,577
Purchase consideration, value of shares issued	$ 10,859

Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Intangibles	$ 76,800	$ 30,300
Goodwill	155,466	107,086	$ 90,512
Gain on bargain purchase			(1,116)
Less seller obligations	5,128	4,459	13,180
Cash paid	137,367	55,493	85,200
Alpha [Member]
Business Acquisition [Line Items]
Cash	247
Accounts receivable	29,851
Inventories	1,852
Other current assets	4,500
Property and equipment	1,528
Intangibles	57,200
Goodwill	38,511
Other non-current assets	383
Accounts payable and other current liabilities	(17,401)
Fair value of assets acquired	116,671
Less fair value of common stock issued	10,859
Less seller obligations	2,002
Cash paid	103,810
Columbia [Member]
Business Acquisition [Line Items]
Accounts receivable	1,004
Inventories	704
Other current assets	8
Property and equipment	659
Intangibles	4,760
Goodwill	2,184
Other non-current assets	32
Accounts payable and other current liabilities	(358)
Fair value of assets acquired	8,993
Less seller obligations	225
Cash paid	8,768
Astro [Member]
Business Acquisition [Line Items]
Accounts receivable	924
Inventories	296
Other current assets	36
Property and equipment	640
Intangibles	5,168
Goodwill	2,926
Accounts payable and other current liabilities	(364)
Fair value of assets acquired	9,626
Less seller obligations	482
Cash paid	9,144
Other Acquisition [Member]
Business Acquisition [Line Items]
Accounts receivable	3,195	2,502	4,093
Inventories	1,544	1,183	720
Other current assets	96	24	32
Property and equipment	1,820	1,616	1,574
Intangibles	9,688	11,067	10,534
Goodwill	4,106	5,933	4,809
Other non-current assets	234	345	60
Accounts payable and other current liabilities	(2,619)	(1,618)	(2,220)
Deferred income tax liabilities			(825)
Fair value of assets acquired	18,064	21,052	18,777
Gain on bargain purchase			(1,116)
Total purchase price			17,661
Less seller obligations	2,419	2,299	1,621
Cash paid	15,645	18,753	16,040
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Cash	247	2,181	926
Accounts receivable	34,974	9,554	14,264
Inventories	4,396	2,215	2,454
Other current assets	4,640	25	548
Property and equipment	4,647	2,938	4,867
Intangibles	76,816	30,267	55,365
Goodwill	47,727	16,921	37,104
Other non-current assets	649	461	4,118
Accounts payable and other current liabilities	(20,742)	(4,610)	(9,773)
Deferred income tax liabilities			(6,320)
Long-term debt			(82)
Other long-term liabilities			(3,975)
Fair value of assets acquired	153,354	59,952	99,496
Gain on bargain purchase			(1,116)
Less fair value of common stock issued	10,859
Total purchase price			98,380
Less seller obligations	5,128	4,459	13,180
Cash paid	$ 137,367	55,493	85,200
Alpine [Member]
Business Acquisition [Line Items]
Accounts receivable		3,959
Inventories		700
Property and equipment		656
Intangibles		12,800
Goodwill		6,642
Accounts payable and other current liabilities		(2,046)
Fair value of assets acquired		22,711
Less seller obligations		1,560
Cash paid		21,151
East Coast Insulators II, L.L.C [Member]
Business Acquisition [Line Items]
Cash		2,181
Accounts receivable		3,093
Inventories		332
Other current assets		1
Property and equipment		666
Intangibles		6,400
Goodwill		4,346
Other non-current assets		116
Accounts payable and other current liabilities		(946)
Fair value of assets acquired		16,189
Less seller obligations		600
Cash paid		$ 15,589
BDI Insulation [Member]
Business Acquisition [Line Items]
Cash			661
Accounts receivable			4,735
Inventories			980
Other current assets			368
Property and equipment			1,006
Intangibles			21,280
Goodwill			16,213
Other non-current assets			3,736
Accounts payable and other current liabilities			(3,303)
Deferred income tax liabilities			(5,495)
Other long-term liabilities			(3,736)
Fair value of assets acquired			36,445
Total purchase price			36,445
Less seller obligations			5,765
Cash paid			30,680
CQ Insulation [Member]
Business Acquisition [Line Items]
Cash			100
Accounts receivable			1,423
Inventories			152
Other current assets			39
Property and equipment			190
Intangibles			4,350
Goodwill			3,035
Accounts payable and other current liabilities			(1,539)
Other long-term liabilities			(238)
Fair value of assets acquired			7,512
Total purchase price			7,512
Less seller obligations			2,319
Cash paid			5,193
Layman Brothers Contracting [Member]
Business Acquisition [Line Items]
Accounts receivable			1,245
Inventories			267
Property and equipment			733
Intangibles			5,330
Goodwill			3,143
Accounts payable and other current liabilities			(1,030)
Fair value of assets acquired			9,688
Total purchase price			9,688
Less seller obligations			600
Cash paid			9,088
Eastern Contractor Services [Member]
Business Acquisition [Line Items]
Cash			165
Accounts receivable			2,768
Inventories			335
Other current assets			109
Property and equipment			1,364
Intangibles			13,871
Goodwill			9,904
Other non-current assets			322
Accounts payable and other current liabilities			(1,681)
Long-term debt			(82)
Other long-term liabilities			(1)
Fair value of assets acquired			27,074
Total purchase price			27,074
Less seller obligations			2,875
Cash paid			$ 24,199

Business Combinations - Estimates of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 39,922	$ 18,511	$ 36,129
Weighted Average Estimated Useful Life (yrs)	8 years	9 years	8 years
Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 20,667	$ 8,983	$ 14,567
Weighted Average Estimated Useful Life (yrs)	15 years	15 years	15 years
Covenants Not-to-Compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 2,628	$ 2,773	$ 4,668
Weighted Average Estimated Useful Life (yrs)	5 years	5 years	5 years
Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 13,600
Weighted Average Estimated Useful Life (yrs)	1 year 6 months

Business Combinations - Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract]
Net revenue	$ 1,169,061	$ 1,058,707	$ 786,144
Net income	$ 43,179	$ 43,891	$ 29,463
Basic and diluted net income per share	$ 1,360	$ 1,390	$ 940

Income Per Common Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Dilutive effect of outstanding restricted stock awards after application of the Treasury Stock Method	117,000	61,000	36,000

Subsequent Events - Additional Information (Detail) - USD ($)			12 Months Ended
	Mar. 02, 2018	Jan. 16, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2018
Subsequent Event [Line Items]
Cash consideration paid for acquisition			$ 137,367,000	$ 55,493,000	$ 85,200,000
Common stock repurchase					$ 6,100,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash depoisted in trust treated as restricted cash						$ 10,000,000
Subsequent Event [Member] \| Maximum [Member]
Subsequent Event [Line Items]
Common stock repurchase	$ 50,000,000
Subsequent Event [Member] \| Rocket Insulation & Coatings Inc. [Member]
Subsequent Event [Line Items]
Cash consideration paid for acquisition		$ 2,200,000
Business acquisition date		Jan. 16, 2018

Quarterly Financial Information - Schedule of Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Net revenue	$ 299,869	$ 295,193	$ 282,196	$ 255,669	$ 233,977	$ 225,392	$ 211,913	$ 191,698	$ 1,132,927	$ 862,980	$ 662,719
Gross profit	81,345	85,581	84,928	72,172	68,354	67,260	62,243	54,591	324,026	252,448	188,293
Net income	10,793	12,010	11,973	6,364	11,081	11,549	9,993	5,813	41,140	38,436	26,517
Comprehensive income	$ 11,345	$ 12,042	$ 11,896	$ 6,364	$ 11,081	$ 11,549	$ 9,993	$ 5,813	$ 41,647	$ 38,436	$ 26,517
Basic and diluted net income per share	$ 0.34	$ 0.38	$ 0.38	$ 0.20	$ 0.35	$ 0.37	$ 0.32	$ 0.19	$ 1.30	$ 1.23	$ 0.85