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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

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