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Long - Term Debt and Bank Facility Borrowings (Details Textual) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Jun. 30, 2012
Sep. 30, 2011
Jul. 31, 2011
Nov. 30, 2011
First Amendment [Member]
Jun. 30, 2012
First Amendment [Member]
Apr. 30, 2012
Second Amendment [Member]
Jun. 30, 2012
8.875% Senior Notes [Member]
Dec. 31, 2011
8.875% Senior Notes [Member]
Jun. 30, 2012
8.875% Senior Notes [Member]
Jun. 30, 2012
Senior Notes [Member]
Long-Term Debt and Bank Facility Borrowings (Textual) [Abstract]                    
Maturity of public notes due                 2017-12  
Interest accrued by public notes for each year             8.875% 8.875%    
Discount on notes             $ 0.7   $ 0.7  
Maximum debt allowed for acquisitions                 100  
Maximum borrowing capacity under revolving credit facility         250          
Increase in credit facility       50            
Maximum borrowing capacity under revolving credit facility         350          
Facility size that can be increased without consulting bank group         100          
Description of Variable Rate         Interest rate is LIBOR plus (i) 1.75% (if Availability, as defined in the revolving credit facility agreement is greater than or equal to $150 million), or (ii) 2.00% (if Availability is greater than $75 million but less than $150 million), or (iii) 2.25% (if Availability is less than or equal to $75 million). The commitment fee on the unused portion of the facility is 0.375% per annum          
Debt instrument basis of spread percentage one         1.75%          
Debt instrument basis of spread percentage two         2.00%          
Debt instrument basis of spread percentage three         2.25%          
Minimum revolving credit facility agreement one         150          
Maximum revolving credit facility agreement two         150          
Minimum revolving credit facility agreement two         75          
Minimum revolving credit facility agreement three         75          
Commitment fee on the unused portion of the facility         0.375%          
Availability         43.8          
Availability percentage to maximum facility size         12.50%          
Minimum fixed charge coverage ratio         1.1          
Availability required to make acquisition         40          
Availability required to pay distributions or repurchase common units         61.3          
Percentage of the maximum facility size on a historical pro forma and forward-looking basis         17.50%          
Minimum fixed charge coverage ratio for distributions to unitholders         1.15          
Availability required to pay distributions for the period April 1, 2012 to December 31, 2012           50.0        
Maximum payment of distributions per common unit for the period April 1, 2012 to December 31, 2012           0.2325        
Borrowing base for fixed assets and customer lists before amendment           50.0        
Borrowing base for fixed assets and customer lists           60.0        
Amount of additional subordinated debt           25.0        
Senior notes issuance date                   November 2010
Maximum investment in an unrestricted subsidiary before amendment           10.0        
Maximum investment in unrestricted subsidiary           20.0        
Long-Term Debt and Bank Facility Borrowings (Additional Textual) [Abstract]                    
Restricted payments without passing certain financial tests 22.0                  
Revolving credit facility expiry 2016-06                  
Amount outstanding under the revolving credit facility 0 0                
Letters of credit issued 46.9 46.7                
Availability in compliance with the fixed charge coverage ratio 154.0 162.4                
Available sale of offerings of common units under shelf registration $ 0   $ 250