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Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Accounts receivable	$ 2,050	$ 4,960
Inventories	1,352	1,541
Other current assets	3	907
Property and equipment	1,891	2,826
Intangibles	12,364	20,392
Goodwill	11,332	11,905
Other non-current assets	174	55
Accounts payable and other current liabilities	(104)	(2,484)
Fair value of assets acquired and purchase price	29,062	40,102
Less seller obligations	4,322	5,420
Cash paid	24,740	34,682
First State Insulation [Member]
Business Acquisition [Line Items]
Inventories	291
Property and equipment	989
Intangibles	3,382
Goodwill	1,857
Accounts payable and other current liabilities	(39)
Fair value of assets acquired and purchase price	6,480
Less seller obligations	1,355
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	254	3,229
Inventories	338	1,027
Other current assets	3	879
Property and equipment	667	1,893
Intangibles	2,242	16,681
Goodwill	930	7,007
Other non-current assets	13	19
Accounts payable and other current liabilities	(23)	(2,046)
Fair value of assets acquired and purchase price	4,424	28,689
Less seller obligations	974	3,447
Cash paid	3,450	$ 25,242
Expert Insulation [Member]
Business Acquisition [Line Items]
Accounts receivable	1,796
Inventories	723
Property and equipment	235
Intangibles	6,740
Goodwill	8,545
Other non-current assets	161
Accounts payable and other current liabilities	(42)
Fair value of assets acquired and purchase price	18,158
Less seller obligations	1,993
Cash paid	$ 16,165

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