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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands												12 Months Ended
	Nov. 16, 2020	Oct. 26, 2020	Oct. 13, 2020	Aug. 31, 2020	Aug. 10, 2020	Feb. 29, 2020	Nov. 18, 2019	Jun. 24, 2019	Mar. 18, 2019	Oct. 31, 2018	Mar. 19, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Cash Paid												$ 76,446	$ 52,040	$ 57,740
Seller Obligations												14,086	7,543	7,540
Total Purchase Price												90,532	59,583	65,280
Revenue												40,494	21,812	39,325
Net Income (Loss)												1,892	592	1,157
Royals
Business Acquisition [Line Items]
Cash Paid						$ 7,590						7,590
Seller Obligations						2,500						2,500
Total Purchase Price						10,090
Revenue						11,095
Net Income (Loss)						$ 1,332
Energy One
Business Acquisition [Line Items]
Cash Paid					$ 13,200							13,200
Seller Obligations					1,591							1,591
Total Purchase Price					14,791
Revenue					7,454
Net Income (Loss)					$ (558)
Storm Master
Business Acquisition [Line Items]
Cash Paid				$ 13,000								13,000
Seller Obligations				1,336								1,336
Total Purchase Price				14,336
Revenue				8,131
Net Income (Loss)				$ 619
ICON
Business Acquisition [Line Items]
Cash Paid			$ 16,900									16,900
Seller Obligations			3,598									3,598
Total Purchase Price			20,498
Revenue			4,798
Net Income (Loss)			$ 449
Norkote
Business Acquisition [Line Items]
Cash Paid		$ 8,725										8,725
Seller Obligations		2,426										2,426
Total Purchase Price		11,151
Revenue		2,702
Net Income (Loss)		$ 417
WeatherSeal
Business Acquisition [Line Items]
Cash Paid	$ 9,500											9,500
Seller Obligations	922											922
Total Purchase Price	10,422
Revenue	766
Net Income (Loss)	$ (23)
Other
Business Acquisition [Line Items]
Cash Paid												7,531	5,750	28,593
Seller Obligations												1,713	1,430	4,057
Total Purchase Price												9,244	7,180	32,650
Revenue												5,548	3,339	24,329
Net Income (Loss)												$ (344)	23	639
1st State Insulation
Business Acquisition [Line Items]
Cash Paid									$ 5,125				5,125
Seller Obligations									1,355				1,355
Total Purchase Price									6,480
Revenue									9,828
Net Income (Loss)									$ 476
Expert Insulation
Business Acquisition [Line Items]
Cash Paid								$ 16,165					16,165
Seller Obligations								1,993					1,993
Total Purchase Price								18,158
Revenue								6,484
Net Income (Loss)								$ 155
Premier
Business Acquisition [Line Items]
Cash Paid							$ 25,000						25,000
Seller Obligations							2,765						$ 2,765
Total Purchase Price							27,765
Revenue							2,161
Net Income (Loss)							$ (62)
CDG
Business Acquisition [Line Items]
Cash Paid											$ 9,440			9,440
Seller Obligations											1,973			1,973
Total Purchase Price											11,413
Revenue											11,466
Net Income (Loss)											$ 531
AFT
Business Acquisition [Line Items]
Cash Paid										$ 19,707				19,707
Seller Obligations										1,510				$ 1,510
Total Purchase Price										21,217
Revenue										3,530
Net Income (Loss)										$ (13)

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