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Revenue - Sales by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 4,173,775	$ 1,787,021
Lumber and Lumber Sheet Goods
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	1,728,495	552,481
Manufactured Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	816,133	354,457
Windows, Doors and Millwork
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	718,557	391,317
Gypsum, Roofing and Insulation
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	146,440	110,852
Siding, Metal and Concrete Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	301,910	168,885
Other Building Products and Services
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 462,240	$ 209,029

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