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Segment and Product Information - Segment Reporting Information by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 1,843,297	$ 1,677,300	$ 3,376,361	$ 3,074,415
Lumber And Lumber Sheet Goods
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	657,016	560,877	1,187,711	1,022,292
Manufactured Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	312,496	286,446	582,315	522,679
Windows, Doors And Millwork
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	359,514	329,424	669,212	626,092
Gypsum, Roofing And Insulation
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	144,250	138,662	261,457	250,964
Siding, Metal And Concrete Products
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	178,208	168,070	315,418	300,036
Other Building Products And Services
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 191,813	$ 193,821	$ 360,248	$ 352,352

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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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