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Revenue - Sales by Product Category (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Entity Wide Information Revenue From External Customer [Line Items]        
Net sales $ 5,576,682 $ 1,945,643 $ 9,750,457 $ 3,732,664
Lumber and Lumber Sheet Goods        
Entity Wide Information Revenue From External Customer [Line Items]        
Net sales 2,604,030 622,158 4,332,525 1,174,639
Manufactured Products        
Entity Wide Information Revenue From External Customer [Line Items]        
Net sales 1,091,423 365,782 1,907,555 720,240
Windows, Doors and Millwork        
Entity Wide Information Revenue From External Customer [Line Items]        
Net sales 837,946 404,054 1,556,503 795,370
Siding, Metal and Concrete Products        
Entity Wide Information Revenue From External Customer [Line Items]        
Net sales 414,897 200,575 716,806 369,460
Gypsum, Roofing and Insulation        
Entity Wide Information Revenue From External Customer [Line Items]        
Net sales 191,749 125,789 338,189 236,641
Other Building Products and Services        
Entity Wide Information Revenue From External Customer [Line Items]        
Net sales $ 436,637 $ 227,285 $ 898,879 $ 436,314