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Common Unit Repurchase and Retirement - Additional Information (Detail) - USD ($)
shares in Thousands
Jul. 30, 2015
Jan. 14, 2014
Sep. 30, 2015
Jun. 30, 2015
Jul. 31, 2013
Jul. 31, 2012
Capital Unit [Line Items]            
Partnership's common units authorized for repurchase       6,044    
Second Amendment            
Capital Unit [Line Items]            
Availability required to repurchase common units   $ 45,000,000        
Percentage of the maximum facility size on a historical proforma and forward-looking basis   15.00%        
Non Seasonal maximum borrowing capacity under revolving credit facility   $ 300,000,000   $ 300,000,000    
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units   115.00%        
Subsequent Event | Third Amendment            
Capital Unit [Line Items]            
Availability required to repurchase common units $ 45,000,000          
Percentage of the maximum facility size on a historical proforma and forward-looking basis 15.00%          
Non Seasonal maximum borrowing capacity under revolving credit facility $ 300,000,000   $ 300,000,000      
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units 115.00%          
Initial Common Units Authorized Plan III Common Units Repurchase Program            
Capital Unit [Line Items]            
Partnership's common units authorized for repurchase           3,000
Additional Common Units Authorized Plan III Common Units Repurchase Program            
Capital Unit [Line Items]            
Partnership's common units authorized for repurchase         1,900