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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Cash paid			$ 21,290	$ 18,626
Seller Obligations			3,162	3,799
Total Purchase Price			24,452	22,425
Revenue	$ 371,814	$ 332,584	713,949	634,312
Net (Loss) Income	18,919	16,315	$ 27,753	$ 22,709
First State Insulation [Member]
Business Acquisition [Line Items]
Date			Mar. 18, 2019
Acquisition Type			Asset
Cash paid			$ 5,125
Seller Obligations			1,380
Total Purchase Price			6,505
Revenue	2,942		3,430
Net (Loss) Income	177		$ 200
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		3,324		3,724
Net (Loss) Income		80		$ 65
Other Acquisition [Member]
Business Acquisition [Line Items]
Acquisition Type				Asset
Cash paid				$ 9,186
Seller Obligations				1,826
Total Purchase Price				11,012
Revenue		4,508		5,779
Net (Loss) Income		315		381
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue		7,832		9,503
Net (Loss) Income		$ 395		$ 446
Expert Insulation [Member]
Business Acquisition [Line Items]
Date			Jun. 24, 2019
Acquisition Type			Asset
Cash paid			$ 16,165
Seller Obligations			1,782
Total Purchase Price			17,947
Revenue	192		192
Net (Loss) Income	(33)		(33)
2019 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue	3,134		3,622
Net (Loss) Income	$ 144		$ 167

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