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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Cash paid			$ 24,740	$ 34,682
Seller Obligations			4,322	5,420
Total Purchase Price			29,062	40,102
Revenue	$ 396,449	$ 348,999	1,110,398	983,311
Net Income	21,212	15,563	$ 48,965	$ 38,272
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	3,156		6,586
Net Income	174		$ 374
CDG Acquisition [Member]
Business Acquisition [Line Items]
Date				Mar. 19, 2018
Acquisition Type				Asset
Cash paid				$ 9,440
Seller Obligations				1,973
Total Purchase Price				11,413
Revenue		3,848		7,572
Net Income		164		$ 229
Other Acquisition [Member]
Business Acquisition [Line Items]
Acquisition Type			Asset	Shares/Asset
Cash paid			$ 3,450	$ 25,242
Seller Obligations			974	3,447
Total Purchase Price			4,424	28,689
Revenue	7,262	7,003	7,262	12,782
Net Income	591	42	$ 591	423
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue		10,851		20,354
Net Income		$ 206		$ 652
Expert Insulation [Member]
Business Acquisition [Line Items]
Date			Jun. 24, 2019
Acquisition Type			Asset
Cash paid			$ 16,165
Seller Obligations			1,993
Total Purchase Price			18,158
Revenue	3,147		3,339
Net Income	193		160
2019 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue	13,565		17,187
Net Income	$ 958		$ 1,125

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