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Business Combinations - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Mar. 04, 2014
USD ($)
Sep. 30, 2016
USD ($)
PartnershipUnit
Sep. 30, 2015
USD ($)
PartnershipUnit
Sep. 30, 2014
USD ($)
PartnershipUnit
Business Acquisition [Line Items]        
Number of dealers acquired | PartnershipUnit   4 2 3
Aggregate purchase price partnership acquired     $ 21,100 $ 98,500
Aggregate purchase price allocation, intangible assets     20,700 53,700
Goodwill   $ 212,760 211,045 209,331
Aggregate purchase price allocation, fixed assets     2,500 17,600
Gross purchase price reduced by working capital credits     2,100 27,200
Total Cash paid to acquire business   9,815 21,130 98,463
Cash acquired   $ 0 $ 0 $ 4,151
Griffith Energy Services, Inc.        
Business Acquisition [Line Items]        
Goodwill $ 8,168      
Aggregate purchase price allocation, fixed assets $ 17,263      
Name of acquired entity   Griffith Energy Services, Inc.    
Percentage of voting equity interests acquired 100.00%      
Total Cash paid to acquire business $ 97,700      
Cash paid to acquire business 69,900      
Working capital acquired, net of cash 27,800      
Cash acquired $ 4,200      
Heating Oil Dealer, Motor Fuel Dealer and Propane Dealer        
Business Acquisition [Line Items]        
Aggregate purchase price partnership acquired   $ 9,800    
Aggregate purchase price allocation, intangible assets   5,700    
Goodwill   1,700    
Aggregate purchase price allocation, fixed assets   2,500    
Gross purchase price reduced by working capital credits   $ 100    
Minimum        
Business Acquisition [Line Items]        
Customer lists, other intangibles and trade names amortization period     7 years  
Maximum        
Business Acquisition [Line Items]        
Customer lists, other intangibles and trade names amortization period     20 years