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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 98 Months Ended | 108 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2022 | Jul. 06, 2022 | Dec. 04, 2019 | Jul. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Aug. 31, 2020 | Sep. 30, 2021
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan repayment |  |  |  |  |  |  |  |  |  |  |  | $ 14,615,000 | $ 9,750,000 |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan repayment |  |  |  |  |  |  |  |  |  |  |  | 95,900,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan repayment |  |  |  |  |  |  |  |  |  |  |  | $ 69,100,000 |  |  |
Sixth Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (heating season December to April) under revolving credit facility |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |
Sixth Amendment | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding term loan |  |  |  | $ 165,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior secured term loan maturity period |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's common units repurchased and retired |  |  |  |  |  | 198 | 124 | 165 | 487 | 992 | 1,104 |  |  | 14,400 | 21,979
Average price paid per unit | [1] |  |  |  |  | $ 10.00 | $ 10.59 | $ 11.10 | $ 10.52 | $ 10.50 | $ 10.65 |  |  |  | $ 8.60
Subsequent Event | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (heating season December to April) under revolving credit facility |  |  | 550,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of line of credit for working capital purposes |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior secured term loan maturity date |  |  | Jul. 06, 2027 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Credit Agreement | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding term loan |  |  | $ 165,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior secured term loan maturity period |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Loan repayment |  |  | $ 95,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (heating season December to April) under revolving credit facility |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Loan repayment |  |  | 69,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Sixth Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Availability required to repurchase common units |  |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the maximum facility size on a historical proforma and forward-looking basis |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units |  |  | 115.00% |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's common units repurchased and retired |  |  |  |  | 126 |  |  |  |  |  |  |  |  |  |
Average price paid per unit | [1] |  |  |  | $ 9.73 |  |  |  |  |  |  |  |  |  |
Subsequent Event | Dividend Declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution declared |  | $ 0.1525 |  |  | 0.1525 |  |  |  |  |  |  |  |  |  |
Partners capital projected distribution amount on annualized basis |  | 0.61 |  |  | $ 0.61 |  |  |  |  |  |  |  |  |  |
Minimum dividend distribution per unit |  | $ 0.0675 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to paid to common unit holders |  | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount to paid to the General Partner |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive distribution to the General Partner |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive distributions to management |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid date |  | Aug. 02, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend record date |  | Jul. 25, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Amount includes repurchase costs.

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