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Segment Information Level 4 Segment sales to external customers by product line (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sales to external customers [Line Items]                            
Concentration risk, sales volume                       $ 304,900,000 $ 210,400,000  
Concentration of risk                       11.00% 10.00%  
Sales Revenue, Goods, Net                       2,759,290,000 2,229,325,000 2,215,332,000
Revenue from External Customers 852,295,000 694,600,000 764,600,000 732,900,000 587,000,000 547,400,000 628,000,000 589,400,000 483,200,000 1,597,173,000 1,319,886,000 2,779,062,000 2,248,088,000 2,240,591,000
Building Materials Distribution [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers 681,500,000     580,500,000           1,262,600,000 1,032,000,000 2,190,200,000 1,779,400,000 1,778,000,000
Wood Products [Member]
                            
Sales to external customers [Line Items]                            
Wood Products Sales to Building Materials Distribution                       38.00%    
Revenue from External Customers 280,400,000     241,800,000           549,600,000 453,000,000 943,300,000 712,500,000 687,400,000
Revenue and Related Party Revenue, Net                       589,300,000 470,200,000 464,000,000
Building Materials Distribution and Wood Products Combined [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       2,779,100,000 2,248,100,000 2,240,600,000
Commodity [Member] | Building Materials Distribution [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       1,092,700,000 835,100,000 879,000,000
General line [Member] | Building Materials Distribution [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       794,900,000 722,000,000 697,000,000
Engineered wood products (BMD) [Member] | Building Materials Distribution [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       302,200,000 220,800,000 200,600,000
Plywood and veneer [Member] | Wood Products [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       324,600,000 214,500,000 224,000,000
Engineered wood products (WP) [Member] | Wood Products [Member]
                            
Sales to external customers [Line Items]                            
Wood Products Sales to Building Materials Distribution                       73.00%    
Revenue from External Customers                       87,900,000 92,100,000 86,500,000
Lumber [Member] | Wood Products [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       77,400,000 69,600,000 67,500,000
Byproducts [Member] | Wood Products [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       44,600,000 44,500,000 33,900,000
Particleboard [Member] | Wood Products [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       33,100,000 26,100,000 28,200,000
Other [Member] | Wood Products [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers                       21,800,000 23,300,000 24,000,000
Operating Segments [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers 852,295,000     732,900,000           1,597,173,000 1,319,886,000 2,759,300,000 2,229,300,000 2,215,300,000
Operating Segments [Member] | Building Materials Distribution [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers 681,500,000     580,500,000           1,262,600,000 1,032,000,000 2,189,800,000 1,777,900,000 1,776,600,000
Operating Segments [Member] | Wood Products [Member]
                            
Sales to external customers [Line Items]                            
Revenue from External Customers 170,800,000     152,400,000           334,600,000 288,000,000 569,500,000 451,400,000 438,800,000
Foreign unaffiliated customers [Member]
                            
Sales to external customers [Line Items]                            
Sales Revenue, Goods, Net                       $ 70,000,000 $ 57,300,000 $ 42,300,000