Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Cash paid	$ 8,501
Seller Obligations	2,570
Total Purchase Price	11,071
Revenue	397,331	$ 342,135
Net Income	$ 15,988	$ 8,834
Royals [Member]
Business Acquisition [Line Items]
Date	Feb. 29, 2020
Acquisition Type	Asset
Cash paid	$ 7,590
Seller Obligations	2,500
Total Purchase Price	10,090
Revenue	784
Net Income	$ (87)
First State Insulation [Member]
Business Acquisition [Line Items]
Date		Mar. 18, 2019
Acquisition Type		Asset
Cash paid		$ 5,125
Seller Obligations		1,355
Total Purchase Price		6,480
Revenue		488
Net Income		$ 23
Other Acquisition [Member]
Business Acquisition [Line Items]
Date	Jan. 13, 2020
Acquisition Type	Asset
Cash paid	$ 911
Seller Obligations	70
Total Purchase Price	981
Revenue	226
Net Income	(21)
2020 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue	1,010
Net Income	$ (108)