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Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 174,959		$ 173,049
Less seller obligations	1,380	$ 3,093
First State Insulation [Member]
Business Acquisition [Line Items]
Inventories	291
Property and equipment	989
Intangibles	3,382
Goodwill	1,882
Accounts payable and other current liabilities	(39)
Fair value of assets acquired and purchase price	6,505
Less seller obligations	1,380
Cash paid	$ 5,125
CDG Acquisition [Member]
Business Acquisition [Line Items]
Accounts receivable		1,731
Inventories		514
Other current assets		28
Property and equipment		933
Intangibles		3,711
Goodwill		4,898
Other non-current assets		36
Accounts payable and other current liabilities		(438)
Fair value of assets acquired and purchase price		11,413
Less seller obligations		1,973
Cash paid		9,440
Other Acquisition [Member]
Business Acquisition [Line Items]
Inventories		75
Other current assets		12
Property and equipment		517
Intangibles		1,675
Goodwill		764
Accounts payable and other current liabilities		(25)
Fair value of assets acquired and purchase price		3,018
Less seller obligations		953
Cash paid		2,065
Combined Business Acquisitions [Member]
Business Acquisition [Line Items]
Accounts receivable		1,731
Inventories		589
Other current assets		40
Property and equipment		1,450
Intangibles		5,386
Goodwill		5,662
Other non-current assets		36
Accounts payable and other current liabilities		(463)
Fair value of assets acquired and purchase price		14,431
Less seller obligations		2,926
Cash paid		$ 11,505

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