Acquisitions - Additional Information (Detail) - USD ($)			9 Months Ended	12 Months Ended
	May 17, 2021	Apr. 01, 2021	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Combined acquired goodwill			$ 132,387,000	$ 28,197,000
Goodwill deductible for tax purpose, period			15 years
Combined federal and state tax rate			28.00%
Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets, expected useful life			8 years	11 years
Trade Name
Business Acquisition [Line Items]
Acquired intangible assets, expected useful life			8 years
Non-compete [Member]
Business Acquisition [Line Items]
Acquired intangible assets, expected useful life			5 years
Customer Backlog [Member]
Business Acquisition [Line Items]
Acquired intangible assets, expected useful life			6 months
Design Space Modular Buildings PNW, LP [Member]
Business Acquisition [Line Items]
Purchase of assets	$ 267,300,000
Business acquisition, transaction costs	1,000,000.0
Combined acquired goodwill	$ 101,874,000
GRS Holding LLC, DBA Kitchens To Go [Member]
Business Acquisition [Line Items]
Purchase of assets		$ 18,300,000
Business acquisition, transaction costs		300,000
Combined acquired goodwill		$ 2,322,000
Design Space and Kitchens To Go [Member]
Business Acquisition [Line Items]
Combined acquired goodwill			$ 104,196