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Level 4 Summary of Significant Accounting Policies (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
employee
Integer
Dec. 31, 2012
Dec. 31, 2011
Trade receivables, allowances $ 2,509,000 $ 2,696,000  
Money market funds, fair value 85,800,000 10,600,000  
Vendor rebates and allowances 4,700,000 4,100,000  
Customer rebates payable 24,200,000 19,700,000  
Long-Lived Assets     2,500,000
Asset Impairment Charges     2,000,000
Asset retirement obligations 400,000 300,000  
LTIP Expense   6,700,000 2,400,000
Deferred software costs 3,700,000 3,700,000  
Amortization of deferred software costs 1,300,000 1,200,000 1,000,000
Number of employees 5,270    
Number of collective bargaining arrangements 9    
Number of employees working pursuant to a collective bargaining agreement Fewer than 1% of our total employees are working pursuant to a collective bargaining agreement that will expire within the next 12 months.    
Self insurance liabilities, current 7,900,000 7,200,000  
Self insurance liabilities, long-term 10,100,000 10,000,000  
Customer Concentration Risk [Member]
      
Concentration of risk 30.00%    
Accounts Receivable [Member] | Credit Concentration Risk [Member]
      
Concentration of risk 13.00% 14.00%  
Workforce Subject to Collective Bargaining Arrangements [Member]
      
Concentration of risk 27.00%    
Building Materials Distribution [Member]
      
Shipping and handling costs 94,800,000 89,300,000 79,900,000
6.375% senior notes [Member]
      
6.375% senior notes, book value 299,990,000 250,000,000  
6.375% senior notes, fair value 304,500,000    
Fair Value Measurement [Domain]
      
Long-Lived Assets     $ 500,000