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Summary of Significant Accounting Policies Level 4 Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Integer
employee
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2013
Dec. 31, 2012
Customer Concentration Risk [Member]
Jun. 30, 2013
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Dec. 31, 2012
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Dec. 31, 2011
Accounts Receivable [Member]
Credit Concentration Risk [Member]
Dec. 31, 2012
Workforce Subject to Collective Bargaining Arrangements [Member]
Dec. 31, 2012
Number of Collective Bargaining Arrangements Expiring Within One Year [Member]
Integer
Dec. 31, 2012
Building Materials Distribution [Member]
Dec. 31, 2011
Building Materials Distribution [Member]
Dec. 31, 2010
Building Materials Distribution [Member]
Jun. 30, 2013
6.375% senior notes
Dec. 31, 2012
6.375% senior notes
Dec. 31, 2011
6.375% senior notes
Dec. 31, 2011
Fair Value Measurement [Domain]
Shipping and handling costs                     $ 89,300,000 $ 79,900,000 $ 77,900,000        
Trade receivables, allowances 2,696,000 2,142,000   2,546,000                          
Concentration of risk 11.00% 10.00%     29.00% 16.00% 14.00% 14.00% 30.00%                
Money market funds, fair value 10,600,000 164,600,000   176,800,000                          
6.375% senior notes, book value                           250,000,000 250,000,000 0  
6.375% senior notes, fair value                           253,800,000 251,600,000    
Vendor rebates and allowances 4,100,000 2,800,000   4,000,000                          
Customer rebates payable 19,700,000 15,600,000   21,200,000                          
Asset retirement obligations 300,000 200,000                              
Deferred software costs 3,700,000 4,600,000                              
Amortization of deferred software costs 1,200,000 1,000,000 800,000                            
Number of employees 4,560                                
Number of collective bargaining arrangements 10                 2              
Description of Employees with bargaining agreements expiring within one year 356 employees at our facility in Florien, Louisiana, and 273 employees at our facility in Oakdale, Louisiana                                
Self insurance liabilities, current 7,200,000 7,600,000                              
Self insurance liabilities, long-term 10,000,000 9,700,000                              
Long lived assets [Abstract]                                  
Long-lived assets   2,500,000                             500,000
Impairment charge of long-lived assets   $ (2,000,000)