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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 67 Months Ended
Apr. 30, 2018
Mar. 31, 2018
Feb. 28, 2018
Mar. 31, 2018
Mar. 31, 2018
Jan. 31, 2018
Plan III Common Units Repurchase Program            
Subsequent Event [Line Items]            
Company's common units repurchased and retired   1,023 258 1,281   2,700
Average price paid per unit [1]   $ 9.36 $ 9.48 $ 9.38    
Heating Oil Dealer            
Subsequent Event [Line Items]            
Aggregate purchase price partnership acquired         $ 0.3  
Subsequent Event | Plan III Common Units Repurchase Program            
Subsequent Event [Line Items]            
Company's common units repurchased and retired [2] 626          
Average price paid per unit [1],[2] $ 9.71          
Subsequent Event | Dividend Declared            
Subsequent Event [Line Items]            
Distribution declared 0.1175          
Partners capital projected distribution amount on annualized basis 0.47          
Minimum dividend distribution per unit $ 0.0675          
Amount to paid to common unit holders $ 6.3          
Amount to paid to the General Partner 0.2          
Incentive distribution to the General Partner 0.2          
Incentive distributions to management $ 0.2          
Dividend payable date May 07, 2018          
Dividend record date Apr. 27, 2018          
Subsequent Event | Heating Oil Dealer            
Subsequent Event [Line Items]            
Aggregate purchase price partnership acquired $ 16.5          
Cash paid 16.1          
Deferred liabilities 0.4          
Purchase price allocation, intangible assets 9.6          
Purchase price allocation, fixed assets 3.4          
Purchase price allocation, working capital $ 3.5          
[1] Amount includes repurchase costs.
[2] See Note 14 - Subsequent Events