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Revenue - Sales by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 1,700,436	$ 1,533,064
Lumber And Lumber Sheet Goods
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	643,909	530,695
Manufactured Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	294,178	269,819
Windows, Doors And Millwork
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	332,152	309,698
Gypsum, Roofing And Insulation
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	112,876	117,207
Siding, Metal And Concrete Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	142,163	137,210
Other Building Products And Services
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 175,158	$ 168,435

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+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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