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Revenue - Sales by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 1,787,021	$ 1,631,300
Lumber and Lumber Sheet Goods
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	552,481	517,689
Manufactured Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	354,457	317,352
Windows, Doors and Millwork
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	391,317	353,390
Gypsum, Roofing and Insulation
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	110,852	120,919
Siding, Metal and Concrete Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	168,885	149,918
Other Building Products and Services
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 209,029	$ 172,032

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+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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