Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands									3 Months Ended		6 Months Ended
	Jun. 26, 2017	May 01, 2017	Mar. 20, 2017	Jan. 05, 2017	Apr. 12, 2016	Feb. 29, 2016	Feb. 02, 2016	Jan. 25, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Goodwill acquired expected to be tax deductible									$ 40,000		$ 40,000
Revenue									282,196	$ 211,913	537,865	$ 403,611
Net income (loss)									11,973	9,993	18,337	15,806
Seller obligations in connection with acquisition of businesses											3,025	2,430
Amortization of intangibles									6,550	2,810	12,966	5,289
Income tax expense (benefit)									5,998	4,960	9,781	8,069
Interest expense									4,865	1,509	7,035	3,061
Administrative [Member]
Business Acquisition [Line Items]
Acquisition-related costs									700	400	1,300	$ 800
Alpha [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition				$ 103,800							103,810
Business combination contingencies amount recognized				21,700
Purchase consideration, value of shares issued				$ 10,900
Purchase consideration, number of shares issued				282,577
Seller obligations				$ 2,000
Revenue									30,300		58,500
Net income (loss)									200		500
Seller obligations in connection with acquisition of businesses											2,002
Common stock issued upon acquisition												282,577
Key Insulation [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition								$ 5,000
Revenue										2,200	4,300
Net income (loss)										(100)	(200)
Seller obligations in connection with acquisition of businesses								$ 700
Marshall Insulation LLC [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition							$ 900
Revenue										900		$ 1,500
Net income (loss)										(76)		(200)
Seller obligations in connection with acquisition of businesses							$ 100
Kern Door Company [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition						$ 2,900
Revenue										700		1,000
Net income (loss)										200		100
Seller obligations in connection with acquisition of businesses						$ 100
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition											117,130	29,948
Seller obligations in connection with acquisition of businesses											3,025	2,430
Amortization of intangibles									200	4,100	400	8,500
Income tax expense (benefit)									200	1,100	600	1,800
Interest expense										500		900
Custom Glass Atlanta Inc and Atlanta Commercial Glazing Inc [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition			$ 3,400
Seller obligations			$ 300
Revenue									3,600		4,100
Net income (loss)									200		300
Legacy Glass & Supply Inc [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition		$ 2,100
Revenue									1,100		1,100
Net income (loss)									16		16
Seller obligations in connection with acquisition of businesses		$ 100
Columbia Shelving & Mirror Inc And Charleston Shelving & Mirror Inc [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition	$ 7,800
Revenue									200		200
Net income (loss)									$ 7		$ 7
Seller obligations in connection with acquisition of businesses	$ 600
Alpine Insulation Co Inc [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition					$ 21,200
Revenue										6,800		6,800
Net income (loss)										$ 400		$ 400
Seller obligations in connection with acquisition of businesses					$ 1,600