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Revenue - Sales by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 5,508,590	$ 2,295,450	$ 15,259,047	$ 6,028,114
Lumber and Lumber Sheet Goods
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	2,400,538	851,594	6,726,566	2,026,233
Manufactured Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	1,253,918	421,296	3,162,147	1,141,535
Windows, Doors and Millwork
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	864,553	420,158	2,413,107	1,215,528
Siding, Metal and Concrete Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	414,197	212,383	1,132,232	581,844
Gypsum, Roofing and Insulation
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	168,497	149,545	510,909	386,186
Other Building Products and Services
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 406,887	$ 240,474	$ 1,314,086	$ 676,788

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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