Business Combinations - Additional Information (Detail) - USD ($)						3 Months Ended
	Mar. 20, 2017	Jan. 05, 2017	Feb. 29, 2016	Feb. 02, 2016	Jan. 25, 2016	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Goodwill acquired expected to be tax deductible						$ 36,600,000
Acquisition-related costs						600,000	$ 400,000
Revenue						255,669,000	191,698,000
Net income (loss)						6,364,000	5,813,000
Purchase price paid in cash						106,873,000	8,797,000
Seller obligations in connection with acquisition of businesses						2,503,000	1,052,000
Amortization of intangibles						6,416,000	2,479,000
Income tax expense (benefit)						3,783,000	3,108,000
Interest expense						2,170,000	1,553,000
Key Insulation [Member]
Business Acquisition [Line Items]
Revenue							2,100,000
Net income (loss)							(28,000)
Purchase price paid in cash					$ 5,000,000
Seller obligations in connection with acquisition of businesses					$ 700,000
Marshall Insulation LLC [Member]
Business Acquisition [Line Items]
Revenue							600,000
Net income (loss)							(86,000)
Purchase price paid in cash				$ 900,000
Seller obligations in connection with acquisition of businesses				$ 100,000
Kern Door Company [Member]
Business Acquisition [Line Items]
Revenue							300,000
Net income (loss)							13,000
Purchase price paid in cash			$ 2,900,000
Seller obligations in connection with acquisition of businesses			$ 100,000
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition						107,120,000	8,797,000
Seller obligations in connection with acquisition of businesses						2,503,000	870,000
Amortization of intangibles						56,000	4,200,000
Income tax expense (benefit)						100,000	400,000
Interest expense							$ 500,000
Trilok Industries, Inc., Alpha Insulation & Waterproofing, Inc. and Alpha Insulation & Waterproofing Company [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition		$ 103,800,000
Business combination contingencies amount recognized		21,700,000
Purchase consideration, value of shares issued		$ 10,900,000
Purchase consideration, number of shares issued		282,577
Seller obligations		$ 2,000,000
Revenue						28,200,000
Net income (loss)						900,000
Custom Glass Atlanta Inc and Atlanta Commercial Glazing Inc [Member]
Business Acquisition [Line Items]
Cash consideration paid for acquisition	$ 3,300,000
Seller obligations	$ 500,000
Revenue						500,000
Net income (loss)						$ 21,000