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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	May 07, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	BLDR
Entity Registrant Name	Builders FirstSource, Inc.
Entity Central Index Key	0001316835
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		114,622,930

CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Sales	$ 1,700,436	$ 1,533,064
Cost of sales	1,289,384	1,157,012
Gross margin	411,052	376,052
Selling, general and administrative expenses	358,908	335,775
Income from operations	52,144	40,277
Interest expense, net	26,742	36,157
Income before income taxes	25,402	4,120
Income tax expense	2,182	298
Net income	23,220	3,822
Comprehensive income	$ 23,220	$ 3,822
Net income per share:
Basic	$ 0.20	$ 0.03
Diluted	$ 0.20	$ 0.03
Weighted average common shares:
Basic	114,090	111,964
Diluted	116,696	114,580

CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 10,069	$ 57,533
Accounts receivable, less allowances of $11,874 and $11,771 at March 31, 2018 and December 31, 2017, respectively	710,448	631,992
Other receivables	60,762	71,232
Inventories, net	678,790	601,547
Other current assets	43,046	33,564
Total current assets	1,503,115	1,395,868
Property, plant and equipment, net	643,721	639,303
Assets held for sale	5,273	5,273
Goodwill	740,411	740,411
Intangible assets, net	126,360	132,567
Deferred income taxes	73,092	75,105
Other assets, net	17,717	17,597
Total assets	3,109,689	3,006,124
Current liabilities:
Checks outstanding	30,996
Accounts payable	488,178	514,282
Accrued liabilities	187,804	271,597
Current maturities of long-term debt and lease obligations	12,413	12,475
Total current liabilities	719,391	798,354
Long-term debt and lease obligations, net of current maturities, debt discount and debt issuance costs	1,928,410	1,771,945
Other long-term liabilities	60,915	59,616
Total liabilities	2,708,716	2,629,915
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.01 par value, 10,000 shares authorized; zero shares issued and outstanding
Common stock, $0.01 par value, 200,000 shares authorized; 114,619 and 113,572 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	1,146	1,136
Additional paid-in capital	546,832	546,766
Accumulated deficit	(147,005)	(171,693)
Total stockholders' equity	400,973	376,209
Total liabilities and stockholders' equity	$ 3,109,689	$ 3,006,124

CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Allowances on trade accounts receivable	$ 11,874	$ 11,771
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	114,619,000	113,572,000
Common stock, shares outstanding	114,619,000	113,572,000

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 23,220	$ 3,822
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	22,819	23,592
Amortization and write-off of debt issuance costs and debt discount	1,149	2,435
Deferred income taxes	1,497	40
Bad debt expense	443	681
Stock compensation expense	2,890	2,904
Net loss (gain) on sale of assets and asset impairments	(245)	3,145
Changes in assets and liabilities:
Receivables	(57,575)	(41,655)
Inventories	(85,958)	(76,243)
Other current assets	(9,481)	(6,118)
Other assets and liabilities	1,552	348
Accounts payable and checks outstanding	4,376	50,949
Accrued liabilities	(83,012)	(100,342)
Net cash used in operating activities	(178,325)	(136,442)
Cash flows from investing activities:
Purchases of property, plant and equipment	(20,113)	(9,778)
Proceeds from sale of property, plant and equipment	568	449
Net cash used in investing activities	(19,545)	(9,329)
Cash flows from financing activities:
Borrowings under revolving credit facility	555,000	457,000
Repayments under revolving credit facility	(399,000)	(315,000)
Repayments of long-term debt and other loans	(2,780)	(2,626)
Payments of loan costs		(2,765)
Exercise of stock options	2,041	1,701
Repurchase of common stock	(4,855)	(2,473)
Net cash provided by financing activities	150,406	135,837
Net change in cash and cash equivalents	(47,464)	(9,934)
Cash and cash equivalents at beginning of period	57,533	14,449
Cash and cash equivalents at end of period	$ 10,069	$ 4,515

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Cash Flows [Abstract]
Non cash retirement of assets related to lease finance obligations	$ 600,000	$ 0
Non cash extinguishment of related lease finance obligation	600,000
Equipment purchased and financed through capital lease obligations	3,100,000	1,200,000
Purchases of property, plant and equipment included in accounts payable	$ 3,200,000	$ 400,000

CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - 3 months ended Mar. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid in Capital	Accumulated Deficit
Balance at Dec. 31, 2017	$ 376,209	$ 1,136	$ 546,766	$ (171,693)
Balance, shares at Dec. 31, 2017	113,572	113,572
Vesting of restricted stock units		$ 7	(7)
Vesting of restricted stock units, shares		766
Stock compensation expense	$ 2,890		2,890
Exercise of stock options	2,041	$ 5	2,036
Exercise of stock options, shares		517
Repurchase of common stock	(4,855)	$ (2)	(4,853)
Repurchase of common stock, shares		(236)
Cumulative effect adjustment (Note 1)	1,468			1,468
Net income	23,220			23,220
Balance at Mar. 31, 2018	$ 400,973	$ 1,146	$ 546,832	$ (147,005)
Balance, shares at Mar. 31, 2018	114,619	114,619

Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation Builders FirstSource, Inc., a Delaware corporation formed in 1998, is a leading supplier and manufacturer of building materials, manufactured components and construction services to professional homebuilders, sub-contractors, remodelers and consumers. The Company operates 402 locations in 40 states across the United States. In this quarterly report, references to the “Company,” “we,” “our,” “ours” or “us” refer to Builders FirstSource, Inc. and its consolidated subsidiaries unless otherwise stated or the context otherwise requires. In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all recurring adjustments and normal accruals necessary for a fair statement of the Company’s financial position, results of operations and cash flows for the dates and periods presented. Results for interim periods are not necessarily indicative of the results to be expected during the remainder of the current year or for any future period. Intercompany transactions are eliminated in consolidation. The condensed consolidated balance sheet as of December 31, 2017 is derived from the audited consolidated financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America. This condensed consolidated balance sheet as of December 31, 2017 and the unaudited condensed consolidated financial statements included herein should be read in conjunction with the more detailed audited consolidated financial statements for the year ended December 31, 2017 included in our most recent annual report on Form 10-K. Accounting policies used in the preparation of these unaudited condensed consolidated financial statements are consistent with the accounting policies described in the Notes to Consolidated Financial Statements included in our Form 10-K. Recent Accounting Pronouncements In May 2017, the Financial Accounting Standards Board (“FASB”) issued an update to the existing guidance under the Compensation-Stock Compensation topic of the Accounting Standards Codification (“Codification”) to clarify when modification accounting would be applied for a change to the terms or conditions of a share-based award. Under this new guidance modification accounting is required only if the fair value, the vesting conditions, or the classification of the award changes as a result of the change in terms or conditions. This guidance was required to be adopted on a prospective basis for annual periods beginning on or after December 15, 2017. As such, the Company adopted this guidance on January 1, 2018. The adoption of this guidance did not have an impact on our financial statements. In January 2017, the FASB issued an update to the existing guidance under the Business Combinations topic of the Codification. This update revises the definition of a business. Under this guidance when substantially all of the assets acquired are concentrated in a single asset (or group of similar assets) the assets acquired would not be considered a business. If this initial screen is met the need for further assessment is eliminated. If this screen is not met in order to be considered a business an acquisition would have to include an input and a substantive process that together significantly contribute to the ability to create outputs. This update was required to be adopted by public companies on a prospective basis for annual and interim reporting periods beginning after December 15, 2017. As such, the Company adopted this guidance on January 1, 2018. The adoption of this guidance did not have an impact on our financial statements. In February 2016, the FASB issued an update to the existing guidance under the Leases topic of the Codification. Under the new guidance, lessees will be required to recognize the following for all leases, with the exception of short-term leases, at the commencement date: (1) a lease liability, which is a lessee‘s obligation to make lease payments arising from a lease, measured on a discounted basis; and (2) a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. This update requires a modified retrospective transition as of the beginning of the earliest comparative period presented in the financial statements. This update is effective for public companies for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The Company intends to adopt this guidance on a modified retrospective basis on January 1, 2019. We also intend to elect certain of the transition practical expedients permitted under this new guidance. The FASB issued a proposed update in January 2018 which, if ultimately adopted by the FASB, would allow an entity to elect an option to apply the transition provisions prospectively as of the effective date of the new standard rather than as of the earliest comparative period presented. If the FASB adopts this proposed update in its current form, we will re-evaluate to determine which transition option we will elect. The Company has a significant number of leases, primarily related to real estate and rolling stock, which are accounted for as operating leases under existing guidance. While we are currently evaluating the impact of this new guidance on our financial statements, we are expecting a significant impact to our balance sheet upon adoption related to the establishment of lease liabilities and the corresponding right-of-use assets. We are also currently assessing and updating our business processes, systems and controls to ensure compliance with the accounting and disclosure requirements of the new standard upon adoption. In May 2014, the FASB issued an update to the existing guidance under the Revenue Recognition topic of the Codification which is a comprehensive new revenue recognition model requiring a company to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Subsequent to issuance of the original update, the FASB issued several further updates amending this new guidance. In April 2016, the FASB issued an update clarifying issues related to identifying performance obligations and licensing. In May 2016, the FASB issued an update regarding the assessment of collectability criteria, presentation of sales taxes, measurement of noncash consideration and transition guidance for completed contracts and contract modifications. Under previous guidance, we recognized sales from contracts with service elements on the completed contract method when these contracts were completed within 30 days. The remaining contracts with service elements were recognized under the percentage of completion method. On January 1, 2018 we adopted this guidance on a modified retrospective basis for contracts which were not completed as of January 1, 2018. Under this updated guidance, revenue related to our contracts with service elements is now recognized over time based on the extent of progress towards completion of the performance obligation because of continuous transfer of control to the customer. We have assessed and updated our business processes, systems and controls to ensure compliance with the recognition and disclosure requirements of the new standard. Results for periods beginning on or after January 1, 2018 are presented in accordance with this new guidance. Results for prior periods have not been adjusted and continue to be presented under previous guidance. Upon adoption, the Company recognized a $2.0 million ($1.5 million net of taxes) impact to the beginning balance of our accumulated deficit through a cumulative effect adjustment related to the unrecognized portion of contracts previously accounted for under the completed contract method of revenue recognition.

Revenue

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Revenue

2. Revenue

We recognize revenue as performance obligations are satisfied by transferring control of a promised good or service to a customer in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. We generally classify our revenues into two types: (i) distribution sales; or (ii) sales related to contracts with service elements. Sales related to contracts with service elements represents less than 10% of the Company’s net sales for each period presented.

Distribution sales typically consist of the sale of building products we manufacture and the resale of purchased building products. We recognize revenue related to distribution sales at a point in time upon delivery of the ordered goods to our customers. Payment terms related to distribution sales are not significant as payment is generally received shortly after the point of sale.

Our contracts with service elements primarily relate to installation and construction services. We evaluate whether multiple contracts should be combined and accounted for as a single contract and whether a single or combined contract should be accounted for as a single performance obligation or multiple performance obligations. If a contract is separated into more than one performance obligation, we allocate the transaction price to each performance obligation generally based on observable standalone selling prices of the underlying goods or services. Revenue related to contracts with service elements is generally recognized over time based on the extent of progress towards completion of the performance obligation because of continuous transfer of control to the customer. We consider costs incurred to be indicative of goods and services delivered to the customer. As such, we use a cost based input method to recognize revenue on our contracts with service elements as it best depicts the transfer of assets to our customers. Payment terms related to sales for contracts with service elements are specific to each customer and contract. However, they are considered to be short-term in nature as payments are normally received either throughout the life of the contract or shortly after the contract is complete.

Contract costs include all direct material and labor, equipment costs and those indirect costs related to contract performance. Provisions for estimated losses on uncompleted contracts are recognized in the period in which such losses are determinable. Prepayments for materials or services are deferred until such materials have been delivered or services have been provided. All sales recognized are net of allowances for discounts and estimated returns, based on historical experience. The Company records sales incentives provided to customers as a reduction of revenue. We present all sales tax on a net basis in our consolidated financial statements.

Costs to obtain contracts are expensed as incurred as our contracts are typically completed in one year or less, and where applicable, we generally would incur these costs whether or not we ultimately obtain the contract. We do not disclose the value of our remaining performance obligations on uncompleted contracts as our contracts generally have a duration of one year or less.

The following table disaggregates our sales by product category (in thousands):

	Three Months Ended March 31,
	2018		2017
Lumber & lumber sheet goods	$	643,909	$	530,695
Manufactured products		294,178		269,819
Windows, doors & millwork		332,152		309,698
Gypsum, roofing & insulation		112,876		117,207
Siding, metal & concrete products		142,163		137,210
Other building products & services		175,158		168,435
Net sales	$	1,700,436	$	1,533,064

Information regarding disaggregation of sales by segment is discussed in Note 8 to the condensed consolidated financial statements.

The timing of revenue recognition, billings and cash collections results in accounts receivable, unbilled receivables, contract assets and contract liabilities. Contract asset balances were not significant as of March 31, 2018 or December 31, 2017. Contract liabilities consist of deferred revenue and customer advances and deposits. Contract liability balances are included in accrued liabilities on our consolidated balance sheet and were $36.7 million and $37.2 million as of March 31, 2018 and December 31, 2017, respectively.

Net Income per Common Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Net Income per Common Share

3. Net Income per Common Share

Net income per common share (“EPS”) is calculated in accordance with the Earnings per Share topic of the Codification, which requires the presentation of basic and diluted EPS. Basic EPS is computed using the weighted average number of common shares outstanding during the period. Diluted EPS is computed using the weighted average number of common shares outstanding during the period, plus the dilutive effect of potential common shares.

For the purpose of computing diluted EPS, weighted average shares outstanding have been adjusted for common shares underlying 1.6 million options and 2.0 million restricted stock units (“RSUs”) for the three months ended March 31, 2018. Weighted average shares outstanding have been adjusted for common shares underlying 3.2 million options and 2.2 million RSUs for the three months ended March 31, 2017.

The table below presents a reconciliation of weighted average common shares used in the calculation of basic and diluted EPS (in thousands):

	Three Months Ended March 31,
	2018		2017
Weighted average shares for basic EPS		114,090		111,964
Dilutive effect of options and RSUs		2,606		2,616
Weighted average shares for diluted EPS		116,696		114,580

Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

4. Debt

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

	March 31, 2018			December 31, 2017
2022 facility (1)	$	506,000		$	350,000
2024 notes		750,000			750,000
2024 term loan (2)		461,775			462,950
Lease finance obligations		224,179			225,070
Capital lease obligations		17,257			15,431
		1,959,211			1,803,451
Unamortized debt discount and debt issuance costs		(18,388	)		(19,031	)
		1,940,823			1,784,420
Less: current maturities of long-term debt and lease obligations		12,413			12,475
Long-term debt and lease obligations, net of current maturities	$	1,928,410		$	1,771,945

(1)

The weighted average interest rate was 3.5% and 2.9% as of March 31, 2018 and December 31, 2017, respectively.

(2)

The weighted average interest rate was 4.7% and 4.3% as of March 31, 2018 and December 31, 2017, respectively.

Fair Value

As of March 31, 2018 and December 31, 2017 the Company does not have any financial instruments which are measured at fair value on a recurring basis. We have elected to report the value of our 5.625% senior secured notes due 2024 (“2024 notes”), senior secured term loan facility due 2024 (“2024 term loan”) and $900.0 million revolving credit facility (“2022 facility”) at amortized cost. The fair values of the 2024 notes and the 2024 term loan at March 31, 2018 were approximately $758.1 million and $463.5 million, respectively, and were determined using Level 2 inputs based on market prices. The carrying value of the 2022 facility at March 31, 2018 approximates fair value as the rates are comparable to those at which we could currently borrow under similar terms, are variable and incorporate a measure of our credit risk. As such, the fair value of the 2022 facility was also classified as Level 2 in the hierarchy.

We were not in violation of any covenants or restrictions imposed by any of our debt agreements at March 31, 2018.

Employee Stock-Based Compensation

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Employee Stock-Based Compensation

5. Employee Stock-Based Compensation

Time Based Restricted Stock Unit Grants

In the first quarter of 2018, our board of directors granted 261,000 RSUs to employees under our 2014 Incentive Plan for which vesting is based solely on continuous employment over the requisite service period. The RSUs vest at 33% per year at each anniversary of the grant date over the next three years. The weighted average grant date fair value for these RSUs was $21.19 per unit, which was based on the closing stock price on the grant date.

Performance and Service Condition Based Restricted Stock Unit Grants

In the first quarter of 2018, our board of directors granted 131,000 RSUs to employees under our 2014 Incentive Plan, that vest if the compound annual growth rate of the Company’s total sales in 2020 over 2017 exceeds a composite annual growth rate based on single-family housing starts, multi-family housing starts, and growth in repair and remodeling sales over the same period. Assuming continued employment and if the performance vesting condition is achieved, these awards will cliff vest on the third anniversary of the grant date. The weighted average grant date fair value for these RSUs was $21.19 per unit, which was based on the closing stock price on the grant date.

Market and Service Condition Based Restricted Stock Unit Grants

In the first quarter of 2018, our board of directors granted 131,000 RSUs to employees under our 2014 Incentive Plan for which vesting is contingent upon the Company’s total shareholder return being equal to or exceeding 75% of the median total shareholder return of the Company’s peer group if the median return of the Company’s peer group is positive, or being equal to or better than 125% of the median total shareholder return if the median return of the Company’s peer group is negative. In each case, the measurement will take place over a three year period. Assuming continued employment and if the market vesting condition is met, these awards will cliff vest on the third anniversary of the grant date. The actual number of shares of common stock that may be earned ranges from zero to a maximum of 150% of the RSUs granted. The average grant date fair value for these RSUs was $22.57 per unit, which was determined using the Monte Carlo simulation model using the following assumptions:

Expected volatility (company)	53.9%
Expected volatility (peer group median)	28.4%
Correlation between the company and peer group median	0.39
Expected dividend yield	0.00%
Risk-free rate	2.3%

The expected volatilities and correlation are based on the historical daily returns of our common stock and the common stocks of the constituents of the Company’s peer group over the most recent period equal to the measurement period. The expected dividend yield is based on our history of not paying regular dividends in the past and our current intention to not pay regular dividends in the foreseeable future. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant and has a term equal to the measurement period.

Income Taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

6. Income Taxes

A reconciliation of the statutory federal income tax rate to our effective rate for continuing operations is provided below:

	Three Months Ended March 31,
	2018			2017
Statutory federal income tax rate		21.0	%		35.0	%
State income taxes, net of federal income tax		5.0			5.7
Stock compensation windfall benefit		(16.5	)		(41.5	)
Permanent differences		(1.2	)		0.4
Other		0.3			7.6
		8.6	%		7.2	%

We base our estimate of deferred tax assets and liabilities on current tax laws and rates. In certain cases, we also base our estimate on business plan forecasts and other expectations about future outcomes. Changes in existing tax laws or rates could affect our actual tax results, and future business results may affect the amount of our deferred tax liabilities or the valuation of our deferred tax assets over time. Due to uncertainties in the estimation process, particularly with respect to changes in facts and circumstances in future reporting periods, as well as the residential homebuilding industry’s cyclicality and sensitivity to changes in economic conditions, it is possible that actual results could differ from the estimates used in previous analyses.

Accounting for deferred taxes is based upon estimates of future results. Differences between the anticipated and actual outcomes of these future results could have a material impact on our consolidated results of operations or financial position.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies The Company has a number of known and threatened construction defect legal claims. While these claims are generally covered under the Company’s existing insurance programs to the extent any loss exceeds the deductible, there is a reasonable possibility of loss that is not able to be estimated at this time because (i) many of the proceedings are in the discovery stage, (ii) the outcome of future litigation is uncertain, and/or (iii) the complex nature of the claims. Although the Company cannot estimate a reasonable range of loss based on currently available information, the resolution of these matters could have a material adverse effect on the Company's financial position, results of operations or cash flows. In addition, we are involved in various other claims and lawsuits incidental to the conduct of our business in the ordinary course. We carry insurance coverage in such amounts in excess of our self-insured retention as we believe to be reasonable under the circumstances and that may or may not cover any or all of our liabilities in respect of such claims and lawsuits. Although the ultimate disposition of these other proceedings cannot be predicted with certainty, management believes the outcome of any such claims that are pending or threatened, either individually or on a combined basis, will not have a material adverse effect on our consolidated financial position, cash flows or results of operations. However, there can be no assurances that future adverse judgments and costs would not be material to our results of operations or liquidity for a particular period.

Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

8. Segment Information

We offer an integrated solution to our customers providing manufacturing, supply, and installation of a full range of structural and related building products. We provide a wide variety of building products and services directly to homebuilder customers. We manufacture floor trusses, roof trusses, wall panels, stairs, millwork, windows, and doors. We also provide a full range of construction services. These product and service offerings are distributed across 402 locations operating in 40 states across the United States, which are organized into nine geographical regions. Centralized financial and operational oversight, including resource allocation and assessment of performance on an income (loss) before income taxes basis, is performed by our CEO, whom we have determined to be our chief operating decision maker (“CODM”).

The Company has nine operating segments aligned with its nine geographical regions (Regions 1 through 9). While all of our operating segments have products, distribution methods and customers of a similar nature, certain of our operating segments have been aggregated due to also containing similar economic characteristics, resulting in the following composition of reportable segments:

•

Regions 1 and 2 have been aggregated to form the “Northeast” reportable segment

•

Regions 3 and 5 have been aggregated to form the “Southeast” reportable segment

•

Regions 4 and 6 have been aggregated to form the “South” reportable segment

•

Region 7, 8 and 9 have been aggregated to form the “West” reportable segment

In addition to our reportable segments, our consolidated results include corporate overhead, other various operating activities that are not internally allocated to a geographical region nor separately reported as a single unit to the CODM, and certain reconciling items primarily related to allocations of corporate overhead and rent expense, which have collectively been presented as “All Other”. The accounting policies of the segments are consistent with those referenced in Note 1, except for noted reconciling items.

The following tables present Net sales, income before income taxes and certain other measures for the reportable segments, reconciled to total consolidated operations, for the periods indicated (in thousands):

	Three months ended March 31, 2018
Reportable segments	Net Sales		Depreciation & Amortization		Interest		Income before income taxes
Northeast	$	290,526	$	3,219	$	5,682	$	638
Southeast		390,914		2,613		5,894		11,292
South		472,944		4,985		6,030		19,857
West		510,492		6,371		8,714		5,744
Total reportable segments		1,664,876		17,188		26,320		37,531
All other		35,560		5,631		422		(12,129	)
Total consolidated	$	1,700,436	$	22,819	$	26,742	$	25,402
	Three months ended March 31, 2017
Reportable segments	Net Sales		Depreciation & Amortization		Interest		Income before income taxes
Northeast	$	282,770	$	3,477	$	4,899	$	2,937
Southeast		353,974		2,506		5,325		10,048
South		449,852		4,794		5,603		21,318
West		409,037		6,938		7,099		(3,264	)
Total reportable segments		1,495,633		17,715		22,926		31,039
All other		37,431		5,877		13,231		(26,919	)
Total consolidated	$	1,533,064	$	23,592	$	36,157	$	4,120

Asset information by segment is not reported internally or otherwise reviewed by the CODM nor does the Company earn revenues or have long-lived assets located in foreign countries.

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	9. Related Party Transactions Certain members of the Company’s board of directors serve on the board of directors for one of our suppliers, PGT, Inc. Further, the Company has entered into certain leases of land and buildings with certain employees or non-affiliate stockholders. Activity associated with these related party transactions was not significant as of or for the three months ended March 31, 2018 or 2017. Transactions between the Company and other related parties occur in the ordinary course of business. However, the Company carefully monitors and assesses related party relationships. Management does not believe that any of these transactions with related parties had a material impact on the Company’s results for the three months ended March 31, 2018 or 2017.

Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Schedule of Sales by Product Category

The following table disaggregates our sales by product category (in thousands):

	Three Months Ended March 31,
	2018		2017
Lumber & lumber sheet goods	$	643,909	$	530,695
Manufactured products		294,178		269,819
Windows, doors & millwork		332,152		309,698
Gypsum, roofing & insulation		112,876		117,207
Siding, metal & concrete products		142,163		137,210
Other building products & services		175,158		168,435
Net sales	$	1,700,436	$	1,533,064

Net Income per Common Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of Weighted Average Common Shares Used in Calculation of Basic and Diluted EPS

The table below presents a reconciliation of weighted average common shares used in the calculation of basic and diluted EPS (in thousands):

	Three Months Ended March 31,
	2018		2017
Weighted average shares for basic EPS		114,090		111,964
Dilutive effect of options and RSUs		2,606		2,616
Weighted average shares for diluted EPS		116,696		114,580

Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt and Lease Obligation

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

	March 31, 2018			December 31, 2017
2022 facility (1)	$	506,000		$	350,000
2024 notes		750,000			750,000
2024 term loan (2)		461,775			462,950
Lease finance obligations		224,179			225,070
Capital lease obligations		17,257			15,431
		1,959,211			1,803,451
Unamortized debt discount and debt issuance costs		(18,388	)		(19,031	)
		1,940,823			1,784,420
Less: current maturities of long-term debt and lease obligations		12,413			12,475
Long-term debt and lease obligations, net of current maturities	$	1,928,410		$	1,771,945

(1)

The weighted average interest rate was 3.5% and 2.9% as of March 31, 2018 and December 31, 2017, respectively.

(2)

The weighted average interest rate was 4.7% and 4.3% as of March 31, 2018 and December 31, 2017, respectively.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Employee Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Market and Service Condition Based Restricted Stock Unit Grants

Schedule of Share-based Payment Award, Restricted Stock Unit, Valuation Assumptions

The average grant date fair value for these RSUs was $22.57 per unit, which was determined using the Monte Carlo simulation model using the following assumptions:

Expected volatility (company)	53.9%
Expected volatility (peer group median)	28.4%
Correlation between the company and peer group median	0.39
Expected dividend yield	0.00%
Risk-free rate	2.3%

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Reconciliation of Statutory Federal Income Tax Rate to Our Effective Rate for Continuing Operations

A reconciliation of the statutory federal income tax rate to our effective rate for continuing operations is provided below:

	Three Months Ended March 31,
	2018			2017
Statutory federal income tax rate		21.0	%		35.0	%
State income taxes, net of federal income tax		5.0			5.7
Stock compensation windfall benefit		(16.5	)		(41.5	)
Permanent differences		(1.2	)		0.4
Other		0.3			7.6
		8.6	%		7.2	%

Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Reconciling Information by Reportable Segments

	Three months ended March 31, 2018
Reportable segments	Net Sales		Depreciation & Amortization		Interest		Income before income taxes
Northeast	$	290,526	$	3,219	$	5,682	$	638
Southeast		390,914		2,613		5,894		11,292
South		472,944		4,985		6,030		19,857
West		510,492		6,371		8,714		5,744
Total reportable segments		1,664,876		17,188		26,320		37,531
All other		35,560		5,631		422		(12,129	)
Total consolidated	$	1,700,436	$	22,819	$	26,742	$	25,402
	Three months ended March 31, 2017
Reportable segments	Net Sales		Depreciation & Amortization		Interest		Income before income taxes
Northeast	$	282,770	$	3,477	$	4,899	$	2,937
Southeast		353,974		2,506		5,325		10,048
South		449,852		4,794		5,603		21,318
West		409,037		6,938		7,099		(3,264	)
Total reportable segments		1,495,633		17,715		22,926		31,039
All other		37,431		5,877		13,231		(26,919	)
Total consolidated	$	1,533,064	$	23,592	$	36,157	$	4,120

Basis of Presentation - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 Store States	Jan. 01, 2018 USD ($)
Basis Of Presentation [Line Items]
Entity formed, year	1998
Number of Locations \| Store	402
Number of states \| States	40
Usual completion period for contracts with service elements	30 days
Accounting Standards Update 2014-09 \| Difference between Revenue Guidance in Effect before and after Topic 606
Basis Of Presentation [Line Items]
Cumulative effect adjustment to beginning balance accumulated deficit including tax		$ 2.0
Cumulative effect adjustment to beginning balance accumulated deficit net of tax		$ 1.5

Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenue performance obligation description of good or service	We recognize revenue as performance obligations are satisfied by transferring control of a promised good or service to a customer in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. We generally classify our revenues into two types: (i) distribution sales; or (ii) sales related to contracts with service elements. Sales related to contracts with service elements represents less than 10% of the Company’s net sales for each period presented.
Revenue performance obligation satisfied over time, method used, explanation	We consider costs incurred to be indicative of goods and services delivered to the customer.
Revenue performance obligation satisfied over time, method used, description	As such, we use a cost based input method to recognize revenue on our contracts with service elements as it best depicts the transfer of assets to our customers.
Revenue practical expedient, incremental cost of obtaining contract [true/false]	true
Revenue practical expedient remaining performance obligation [true/false]	true
Contract liability	$ 36.7	$ 37.2
Transferred over Time
Disaggregation Of Revenue [Line Items]
Revenue performance obligation description of payment terms	Payment terms related to sales for contracts with service elements are specific to each customer and contract. However, they are considered to be short-term in nature as payments are normally received either throughout the life of the contract or shortly after the contract is complete.
Transferred over Time \| Maximum
Disaggregation Of Revenue [Line Items]
Percentage of sales related to contracts with service	10.00%
Transferred at Point in Time
Disaggregation Of Revenue [Line Items]
Revenue performance obligation description of payment terms	Payment terms related to distribution sales are not significant as payment is generally received shortly after the point of sale.

Revenue - Sales by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 1,700,436	$ 1,533,064
Lumber And Lumber Sheet Goods
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	643,909	530,695
Manufactured Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	294,178	269,819
Windows, Doors And Millwork
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	332,152	309,698
Gypsum, Roofing And Insulation
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	112,876	117,207
Siding, Metal And Concrete Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	142,163	137,210
Other Building Products And Services
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 175,158	$ 168,435

Net Income per Common Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stock Options
Earnings Per Share [Line Items]
Securities included in the computation of diluted EPS	1.6	3.2
Restricted Stock Units (RSUs)
Earnings Per Share [Line Items]
Securities included in the computation of diluted EPS	2.0	2.2

Net Income per Common Share - Reconciliation of Weighted Average Common Shares Used in Calculation of Basic and Diluted EPS (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of weighted average common shares used in calculation of basic and diluted EPS
Weighted average shares for basic EPS	114,090	111,964
Dilutive effect of options and RSUs	2,606	2,616
Weighted average shares for diluted EPS	116,696	114,580

Debt - Long-Term Debt and Lease Obligation (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Lease finance obligations	$ 224,179	$ 225,070
Capital lease obligations	17,257	15,431
Long term debt and lease obligations gross	1,959,211	1,803,451
Unamortized debt discount and debt issuance costs	(18,388)	(19,031)
Long-term debt and lease obligation	1,940,823	1,784,420
Less: current maturities of long-term debt and lease obligations	12,413	12,475
Long-term debt and lease obligations, net of current maturities	1,928,410	1,771,945
2024 notes
Debt Instrument [Line Items]
Debt instrument carrying amount	750,000	750,000
2024 term loan
Debt Instrument [Line Items]
Debt instrument carrying amount	461,775	462,950
2022 facility
Debt Instrument [Line Items]
Line of credit facility outstanding	$ 506,000	$ 350,000

Debt - Long-Term Debt and Lease Obligation (Parenthetical) (Detail)	Mar. 31, 2018	Dec. 31, 2017
2024 term loan
Debt Instrument [Line Items]
Weighted average interest rate	4.70%	4.30%
2022 facility
Debt Instrument [Line Items]
Weighted average interest rate	3.50%	2.90%

Debt - Fair Value - Additional Information (Detail)	Mar. 31, 2018 USD ($)
2022 facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 900,000,000
2024 notes
Debt Instrument [Line Items]
Private offered aggregate principal amount rate	5.625%
2024 notes \| Level 2
Debt Instrument [Line Items]
Fair value of long term debt	$ 758,100,000
2024 Term Loan \| Level 2
Debt Instrument [Line Items]
Fair value of long term debt	$ 463,500,000

Employee Stock-Based Compensation - Additional Information (Detail) - 2014 Incentive Plan	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Time Based Restricted Stock Unit Grants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Granted \| shares	261,000
Stock award granted vesting period	3 years
Weighted average grant date fair value, granted \| $ / shares	$ 21.19
Time Based Restricted Stock Unit Grants \| Share Based Compensation Award Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	33.00%
Time Based Restricted Stock Unit Grants \| Share Based Compensation Award Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	33.00%
Time Based Restricted Stock Unit Grants \| Share Based Compensation Award Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock award vesting percentage	33.00%
Performance and Service Condition Based Restricted Stock Unit Grants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Granted \| shares	131,000
Weighted average grant date fair value, granted \| $ / shares	$ 21.19
Market and Service Condition Based Restricted Stock Unit Grants
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Granted \| shares	131,000
Stock award granted vesting period	3 years
Weighted average grant date fair value, granted \| $ / shares	$ 22.57
Market and Service Condition Based Restricted Stock Unit Grants \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of number of shares of common stock earned	0.00%
Market and Service Condition Based Restricted Stock Unit Grants \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of number of shares of common stock earned	150.00%
Market and Service Condition Based Restricted Stock Unit Grants \| Vesting Based On Market And Service Contingent On Positive Total Shareholder Return Of Peer Group Measure
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of shareholder return	75.00%
Market and Service Condition Based Restricted Stock Unit Grants \| Vesting Based On Market And Service Contingent On Negative Total Shareholder Return Of Peer Group Measure
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of shareholder return	125.00%

Employee Stock-Based Compensation - Restricted Stock Unit Valuation (Detail) - Market and Service Condition Based Restricted Stock Unit Grants	9 Months Ended
	Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility (company)	53.90%
Expected volatility (peer group median)	28.40%
Correlation between the company and peer group median	0.39
Expected dividend yield	0.00%
Risk-free rate	2.30%

Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Our Effective Rate for Continuing Operations (Detail)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	35.00%
State income taxes, net of federal income tax	5.00%	5.70%
Stock compensation windfall benefit	(16.50%)	(41.50%)
Permanent differences	(1.20%)	0.40%
Other	0.30%	7.60%
Total effective rate for continuing operations	8.60%	7.20%

Segment Information - Additional Information (Detail)	3 Months Ended
Segment Information - Additional Information (Detail)	Mar. 31, 2018 Store States Region Segment
Segment Reporting [Abstract]
Number of Locations \| Store	402
Number of states \| States	40
Number of geographic regions \| Region	9
Number of operating segments \| Segment	9

Segment Information - Schedule of Reconciling Information by Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Entity Wide Information Revenue From External Customer [Line Items]
Net Sales	$ 1,700,436	$ 1,533,064
Depreciation & Amortization	22,819	23,592
Interest	26,742	36,157
Income before income taxes	25,402	4,120
Operating Segments
Entity Wide Information Revenue From External Customer [Line Items]
Net Sales	1,664,876	1,495,633
Depreciation & Amortization	17,188	17,715
Interest	26,320	22,926
Income before income taxes	37,531	31,039
Operating Segments \| Northeast
Entity Wide Information Revenue From External Customer [Line Items]
Net Sales	290,526	282,770
Depreciation & Amortization	3,219	3,477
Interest	5,682	4,899
Income before income taxes	638	2,937
Operating Segments \| Southeast
Entity Wide Information Revenue From External Customer [Line Items]
Net Sales	390,914	353,974
Depreciation & Amortization	2,613	2,506
Interest	5,894	5,325
Income before income taxes	11,292	10,048
Operating Segments \| South
Entity Wide Information Revenue From External Customer [Line Items]
Net Sales	472,944	449,852
Depreciation & Amortization	4,985	4,794
Interest	6,030	5,603
Income before income taxes	19,857	21,318
Operating Segments \| West
Entity Wide Information Revenue From External Customer [Line Items]
Net Sales	510,492	409,037
Depreciation & Amortization	6,371	6,938
Interest	8,714	7,099
Income before income taxes	5,744	(3,264)
All other
Entity Wide Information Revenue From External Customer [Line Items]
Net Sales	35,560	37,431
Depreciation & Amortization	5,631	5,877
Interest	422	13,231
Income before income taxes	$ (12,129)	$ (26,919)