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Business Combinations - Summary of Business Acquisitions (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Seller Obligations	$ 1,380	$ 3,093
Revenue	342,135	301,728
Net (Loss) Income	$ 8,834	$ 6,394
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	488
Net (Loss) Income	$ 23
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		400
Net (Loss) Income		$ (15)
Other Acquisition [Member]
Business Acquisition [Line Items]
Date		Jan. 15, 2018
Acquisition Type		Asset
Cash paid		$ 2,065
Seller Obligations		953
Total Purchase Price		3,018
Revenue		1,271
Net (Loss) Income		66
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid		11,505
Seller Obligations		2,926
Total Purchase Price		14,431
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue		1,671
Net (Loss) Income		$ 51

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