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Subsequent Events - Additional Information (Detail) - Subsequent Event
$ / shares in Units, $ in Millions
1 Months Ended
Apr. 30, 2021
USD ($)
$ / shares
Dividend Declared  
Subsequent Event [Line Items]  
Distribution declared | $ / shares $ 0.1425
Partners capital projected distribution amount on annualized basis | $ / shares 0.57
Minimum dividend distribution per unit | $ / shares $ 0.0675
Amount to paid to common unit holders $ 5.7
Amount to paid to the General Partner 0.3
Incentive distribution to the General Partner 0.3
Incentive distributions to management $ 0.3
Dividend payable date May 11, 2021
Dividend record date May 03, 2021
Heating Oil Dealers  
Subsequent Event [Line Items]  
Aggregate purchase price $ 3.2
Cash paid 2.3
Contingent liabilities 0.9
Aggregate purchase price allocation, intangible assets 3.0
Aggregate purchase price allocation, fixed assets 0.3
Gross purchase price increased (reduced) by working capital credits $ (0.1)