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Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Accounts receivable	$ 1,796	$ 2,316
Inventories	958	1,428
Other current assets		92
Property and equipment	1,224	2,185
Intangibles	10,122	9,871
Goodwill	183,412	7,121	$ 173,049
Other non-current assets	161	36
Accounts payable and other current liabilities	(81)	(624)
Fair value of assets acquired and purchase price	24,452	22,425
Less seller obligations	3,162	3,799
Cash paid	21,290	18,626
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]
Accounts receivable		585
Inventories		914
Other current assets		64
Property and equipment		1,252
Intangibles		6,160
Goodwill		2,223
Accounts payable and other current liabilities		(186)
Fair value of assets acquired and purchase price		11,012
Less seller obligations		1,826
Cash paid		$ 9,186
Expert Insulation [Member]
Business Acquisition [Line Items]
Accounts receivable	1,796
Inventories	667
Property and equipment	235
Intangibles	6,740
Goodwill	8,390
Other non-current assets	161
Accounts payable and other current liabilities	(42)
Fair value of assets acquired and purchase price	17,947
Less seller obligations	1,782
Cash paid	$ 16,165

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