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Segment sales to external customers by product line (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting [Abstract]
Number of Reportable Segments | segment									3
Sales to external customers [Line Items]
Revenue from External Customers	$ 919,500	$ 1,067,200	$ 1,043,800	$ 880,700	$ 876,500	$ 991,600	$ 955,400	$ 809,900	$ 3,911,215	$ 3,633,415	$ 3,573,732
Foreign unaffiliated customers [Member]
Sales to external customers [Line Items]
Revenue from External Customers									71,000	85,000	76,000
Intersegment Eliminations [Member]
Sales to external customers [Line Items]
Revenue from External Customers									(596,800)	(540,000)	(529,900)
Wood Products and Building Materials Distribution [Member]
Sales to external customers [Line Items]
Revenue from External Customers									3,910,800	3,633,400	3,573,700
Wood Products [Member]
Sales to external customers [Line Items]
Revenue from External Customers									683,600	742,300	787,200
Wood Products [Member] | Intersegment Eliminations [Member]
Sales to external customers [Line Items]
Revenue from External Customers									$ (596,800)	(539,800)	(529,800)
Wood Products [Member] | Intersegment Eliminations [Member] | Building Materials Distribution [Member]
Sales to external customers [Line Items]
Intersegment sales as a percentage to total sales (as a percent)									47.00%
Wood Products [Member] | Engineered wood products [Member]
Sales to external customers [Line Items]
Revenue from External Customers									$ 154,400	127,200	125,900
Wood Products [Member] | Plywood and veneer [Member]
Sales to external customers [Line Items]
Revenue from External Customers									316,800	385,500	413,600
Wood Products [Member] | Lumber [Member]
Sales to external customers [Line Items]
Revenue from External Customers									87,200	96,500	113,700
Wood Products [Member] | Byproducts [Member]
Sales to external customers [Line Items]
Revenue from External Customers									56,000	62,000	56,100
Wood Products [Member] | Particleboard [Member]
Sales to external customers [Line Items]
Revenue from External Customers									49,300	51,600	52,300
Wood Products [Member] | Other [Member]
Sales to external customers [Line Items]
Revenue from External Customers									19,900	19,500	25,700
Building Materials Distribution [Member]
Sales to external customers [Line Items]
Revenue from External Customers									3,227,200	2,891,100	2,786,500
Building Materials Distribution [Member] | Intersegment Eliminations [Member]
Sales to external customers [Line Items]
Revenue from External Customers									0	(200)	(100)
Building Materials Distribution [Member] | Commodity [Member]
Sales to external customers [Line Items]
Revenue from External Customers									1,503,000	1,343,400	1,376,100
Building Materials Distribution [Member] | General line [Member]
Sales to external customers [Line Items]
Revenue from External Customers									1,141,900	1,037,800	937,300
Building Materials Distribution [Member] | Engineered wood products [Member]
Sales to external customers [Line Items]
Revenue from External Customers									$ 582,300	$ 509,900	$ 473,100

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+ 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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