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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended
Jul. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Subsequent Event [Line Items]      
Payment to acquire customer lists and propane dealership   $ 8,829 $ 1,069
Subsequent Event      
Subsequent Event [Line Items]      
Payment to acquire customer lists and propane dealership $ 1,000    
Subsequent Event | Dividend Declared      
Subsequent Event [Line Items]      
Distribution declared $ 0.1025    
Partners capital projected distribution amount on annualized basis 0.41    
Minimum dividend distribution per unit $ 0.0675    
Percentage of distributions to common unit holders in excess of minimum quarterly distribution 90.00%    
Percentage of distributions to general unit holders in excess of minimum quarterly distribution 10.00%    
Amount to paid to common unit holders $ 5,900    
Amount to paid to the General Partner 130    
Incentive distribution to the General Partner 100    
Incentive distributions to management $ 100    
Dividend payable date Aug. 09, 2016    
Dividend record date Aug. 01, 2016