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Partnership Organization - Additional Information (Detail)
shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Customer
shares
Sep. 30, 2014
shares
Jun. 30, 2014
Limited Partners' Capital Account [Line Items]          
Percentage of limited partner interest     99.43%    
Percentage of general partner interest     0.57%    
8.875% Senior Notes          
Limited Partners' Capital Account [Line Items]          
Outstanding senior notes | $     $ 125.0    
Interest on senior notes     8.875%   8.875%
Maturity of public notes due     Dec. 01, 2017    
Subsequent Event | 8.875% Senior Notes          
Limited Partners' Capital Account [Line Items]          
Outstanding senior notes | $ $ 125.0 $ 125.0      
Interest on senior notes 8.875% 8.875%      
Redemption price percentage 104.438% 104.438%      
Star Acquisitions, Inc          
Limited Partners' Capital Account [Line Items]          
Ownership interest of partnership     100.00%    
Petro Holdings, Inc          
Limited Partners' Capital Account [Line Items]          
Ownership interest of Star Acquisitions Inc.     100.00%    
Number of full-service residential and commercial home heating oil and propane customers served     446,000    
Number of customers to whom only home heating oil, gasoline and diesel fuel were sold on a delivery only basis     75,000    
Number of customers to whom ancillary services were provided     24,000    
Star Gas Finance Company          
Limited Partners' Capital Account [Line Items]          
Ownership interest of partnership     100.00%    
Common Stock          
Limited Partners' Capital Account [Line Items]          
Number of outstanding units | shares     57,282 57,405  
General Partner          
Limited Partners' Capital Account [Line Items]          
Number of outstanding units | shares     326 326