Business Combinations - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Accounts receivable	$ 10,237	$ 2,050
Inventories	1,596	1,352
Other current assets	587	3
Property and equipment	4,065	1,891
Intangibles	22,146	12,364
Goodwill	11,250	11,332
Other non-current assets	74	174
Accounts payable and other current liabilities	(3,966)	(104)
Deferred income tax liabilities	(35)
Other long-term liabilities	(164)
Fair value of assets acquired and purchase price	45,790	29,062
Less seller obligations	6,965	4,322
Cash paid	38,825	24,740
Royals [Member]
Business Acquisition [Line Items]
Accounts receivable	2,848
Inventories	305
Other current assets	430
Property and equipment	598
Intangibles	3,930
Goodwill	3,015
Other non-current assets	58
Accounts payable and other current liabilities	(1,059)
Deferred income tax liabilities	(35)
Fair value of assets acquired and purchase price	10,090
Less seller obligations	2,500
Cash paid	7,590
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
Other Acquisition [Member]
Business Acquisition [Line Items]
Accounts receivable	1,370	254
Inventories	278	338
Other current assets	145	3
Property and equipment	350	667
Intangibles	2,996	2,242
Goodwill	1,745	930
Other non-current assets	16	13
Accounts payable and other current liabilities	(196)	(23)
Other long-term liabilities	(131)
Fair value of assets acquired and purchase price	6,573	4,424
Less seller obligations	1,538	974
Cash paid	5,035	3,450
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
Energy One [Member]
Business Acquisition [Line Items]
Accounts receivable	3,657
Inventories	838
Other current assets	12
Property and equipment	2,319
Intangibles	6,500
Goodwill	2,859
Accounts payable and other current liabilities	(1,375)
Other long-term liabilities	(19)
Fair value of assets acquired and purchase price	14,791
Less seller obligations	1,591
Cash paid	13,200
Storm Master [Member]
Business Acquisition [Line Items]
Accounts receivable	2,362
Inventories	175
Property and equipment	798
Intangibles	8,720
Goodwill	3,631
Accounts payable and other current liabilities	(1,336)
Other long-term liabilities	(14)
Fair value of assets acquired and purchase price	14,336
Less seller obligations	1,336
Cash paid	$ 13,000