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Revolving Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Jul. 29, 2011
Revolving credit facility [Member]
Jul. 22, 2011
Revolving credit facility [Member]
Jun. 30, 2012
Letters of credit [Member]
Jun. 30, 2012
U.S. [Member]
Jul. 29, 2011
U.S. [Member]
Revolving credit facility [Member]
Jun. 30, 2012
U.S. [Member]
Revolving credit facility [Member]
Dec. 31, 2011
U.S. [Member]
Revolving credit facility [Member]
Aug. 01, 2011
U.S. [Member]
Revolving credit facility [Member]
Jun. 30, 2012
U.S. [Member]
Letters of credit [Member]
Dec. 31, 2011
U.S. [Member]
Letters of credit [Member]
Jun. 30, 2012
Canada [Member]
Revolving credit facility [Member]
Dec. 31, 2011
Canada [Member]
Revolving credit facility [Member]
Revolving Credit Facilities (Textual) [Abstract]                        
Date of the final maturity of revolving credit facility           Jan. 07, 2014         Aug. 12, 2014  
Borrowing balance of revolving credit facility           $ 203.2 $ 93.4       $ 3.5 $ 1.1
Revolving credit facility excess availability           103.7         1.7 2.6
Interest rate on revolving credit facility           4.00% 4.20%       4.00% 4.00%
Outstanding letters of credit                 2.0 2.7    
Collateralized letter of credit securing certain insurance obligations     1.0                  
Additional uncommitted accordion U.S. credit facility           100            
Revolving credit facility maximum borrowing capacity           500            
Percentage of revolving credit facility excess availability threshold           15.00%            
Revolving credit facility excess availability Threshold           30            
U.S. revolving credit facility maximum borrowing capacity less the uncommitted accordion feature           400            
Minimum amount of excess availability required not to reduce outstanding borrowings by customer remittances to our lockbox           35            
Revolving credit facility availability amount           103.7 115.7          
U.S. revolving credit facility maximum availability           400            
lowest level of fiscal month-end availability revolving credit facility           94.0            
Offering of common stock to stockholders via the rights offering   60.0                    
Approximate gross proceeds from fully subscribed rights offering of common stock 60                      
Payment on the U.S. revolving credit facility as a result of the rights offering         50.0              
Additional payment on the U.S. revolving credit facility               6.0        
Percentage of eligible accounts receivable included in calculation of borrowing base           87.50%            
Percentage of net liquidation value of eligible inventory in calculation of borrowing base           90.00%            
Revolving credit facility fixed charge coverage ratio requirement       1.1 to 1.0                
Canadian minimum adjusted tangible net worth covenant                     $ 3.9  
Canadian capital expenditures maximum percentage limit covenant                     120.00%