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Common Unit Repurchase and Retirement - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Jul. 31, 2012
Dec. 31, 2012
First Amendment
Capital Unit [Line Items]    
Partnership's common units authorized for repurchase 3.0  
Availability required to pay distributions for the period April 1, 2012 to December 31, 2012   $ 61.3
Percentage of the maximum facility size on a historical proforma and forward-looking basis   17.50%
Minimum fixed charge coverage ratio to repurchase common units   1.15