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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

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