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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 84 Months Ended | 94 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2020 | Jun. 30, 2020 | May 31, 2020 | Apr. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Apr. 30, 2020
Repurchase Plan |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Company's common units repurchased and retired |  |  | 625 | 106 | 424 | 1,155 | 782 | 1,281 | 13,340 | 12,800
Average price paid per unit | [1] |  | $ 8.45 | $ 8.12 | $ 7.71 | $ 8.15 | $ 8.33 | $ 9.42 | $ 8.08 |
Subsequent Event | Repurchase Plan |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Company's common units repurchased and retired |  | 725 |  |  |  |  |  |  |  |
Average price paid per unit | [1] | $ 8.97 |  |  |  |  |  |  |  |
Subsequent Event | Dividend Declared |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution declared |  | 0.1325 |  |  |  |  |  |  |  |
Partners capital projected distribution amount on annualized basis |  | 0.53 |  |  |  |  |  |  |  |
Minimum dividend distribution per unit |  | $ 0.0675 |  |  |  |  |  |  |  |
Amount to paid to common unit holders |  | $ 5.8 |  |  |  |  |  |  |  |
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 |  | Aug. 04, 2020 |  |  |  |  |  |  |  |
Dividend record date |  | Jul. 27, 2020 |  |  |  |  |  |  |  |
Subsequent Event | Customer List and Assets of Heating Oil Dealer |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate purchase price partnership acquired |  | $ 2.3 |  |  |  |  |  |  |  |
Aggregate purchase price allocation, intangible assets |  | 1.9 |  |  |  |  |  |  |  |
Aggregate purchase price allocation, fixed assets |  | 0.5 |  |  |  |  |  |  |  |
Gross purchase price increased (reduced) by working capital credits |  | $ (0.1) |  |  |  |  |  |  |  |
[1] | Amount includes repurchase costs.

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