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Segment sales to external customers by product line (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) Number2
Segment Reporting [Abstract]
Number of Reportable Segments | segment									3
Sales to external customers [Line Items]
Revenue from External Customers	$ 876,500	$ 991,600	$ 955,400	$ 809,900	$ 862,000	$ 983,300	$ 961,200	$ 767,200	$ 3,633,415	$ 3,573,732	$ 3,273,496
Foreign unaffiliated customers [Member]
Sales to external customers [Line Items]
Revenue from External Customers									84,900	76,200	87,200
Intersegment Eliminations [Member]
Sales to external customers [Line Items]
Revenue from External Customers									(540,000)	(529,900)	$ (460,200)
Wood Products and Building Materials Distribution [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Sales to external customers [Line Items]
Concentration Risk Number of Customers | Number2											1
Concentration risk, sales											$ 350,900
Concentration of credit risk											10.00%
Wood Products [Member]
Sales to external customers [Line Items]
Revenue from External Customers									742,300	787,200	$ 674,000
Wood Products [Member] | Intersegment Eliminations [Member]
Sales to external customers [Line Items]
Revenue from External Customers									$ (539,800)	(529,800)	(460,100)
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)									42.00%
Wood Products [Member] | Plywood and veneer [Member]
Sales to external customers [Line Items]
Revenue from External Customers									$ 385,500	413,600	367,800
Wood Products [Member] | Engineered wood products [Member]
Sales to external customers [Line Items]
Revenue from External Customers									127,200	125,900	104,400
Wood Products [Member] | Lumber [Member]
Sales to external customers [Line Items]
Revenue from External Customers									96,500	113,700	97,300
Wood Products [Member] | Byproducts [Member]
Sales to external customers [Line Items]
Revenue from External Customers									62,000	56,100	42,500
Wood Products [Member] | Particleboard [Member]
Sales to external customers [Line Items]
Revenue from External Customers									51,600	52,300	40,200
Wood Products [Member] | Other [Member]
Sales to external customers [Line Items]
Revenue from External Customers									19,500	25,700	21,700
Building Materials Distribution [Member]
Sales to external customers [Line Items]
Revenue from External Customers									2,891,100	2,786,500	2,599,500
Building Materials Distribution [Member] | Intersegment Eliminations [Member]
Sales to external customers [Line Items]
Revenue from External Customers									(200)	(100)	(100)
Building Materials Distribution [Member] | Commodity [Member]
Sales to external customers [Line Items]
Revenue from External Customers									1,343,400	1,376,100	1,333,200
Building Materials Distribution [Member] | General line [Member]
Sales to external customers [Line Items]
Revenue from External Customers									1,037,800	937,300	857,900
Building Materials Distribution [Member] | Engineered wood products [Member]
Sales to external customers [Line Items]
Revenue from External Customers									$ 509,900	$ 473,100	$ 408,400

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