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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 | 67 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 02, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | May 31, 2018 | Apr. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 31, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of existing term loan |  |  |  |  |  |  |  |  | $ 7,500,000 | $ 13,700,000 |
Repayments of revolving credit facility borrowings |  |  |  |  |  |  |  |  | $ 118,604,000 |  |
Plan III Common Units Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Company's common units repurchased and retired |  |  |  | 261 | 202 | 626 | 1,089 | 1,281 |  |  | 2,700
Average price paid per unit | [1] |  |  | $ 9.56 | $ 9.64 | $ 9.71 | $ 9.66 | $ 9.38 |  |  |
Subsequent Event | Plan III Common Units Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Company's common units repurchased and retired | [2] |  | 125 |  |  |  |  |  |  |  |
Average price paid per unit | [1],[2] |  | $ 9.72 |  |  |  |  |  |  |  |
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 |  |  | $ 6,300,000 |  |  |  |  |  |  |  |
Amount to paid to the General Partner |  |  | 200,000 |  |  |  |  |  |  |  |
Incentive distribution to the General Partner |  |  | 170,000 |  |  |  |  |  |  |  |
Incentive distributions to management |  |  | $ 200,000 |  |  |  |  |  |  |  |
Dividend payable date |  |  | Aug. 07, 2018 |  |  |  |  |  |  |  |
Dividend record date |  |  | Jul. 30, 2018 |  |  |  |  |  |  |  |
Subsequent Event | Fourth Amendment |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility |  | $ 300,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (heating season December to April) under revolving credit facility |  | 450,000,000 |  |  |  |  |  |  |  |  |
Issuance of line of credit for working capital purposes |  | $ 25,000,000 |  |  |  |  |  |  |  |  |
Revolving credit facility expiry |  | Jul. 02, 2023 |  |  |  |  |  |  |  |  |
Repayments of revolving credit facility borrowings |  | $ 33,700,000 |  |  |  |  |  |  |  |  |
Availability required to repurchase common units |  | $ 45,000,000 |  |  |  |  |  |  |  |  |
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 | Term Loan | Fourth Amendment |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding senior notes |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
Senior secured term loan maturity period |  | 5 years |  |  |  |  |  |  |  |  |
Repayments of existing term loan |  | $ 66,300,000 |  |  |  |  |  |  |  |  |
[1] | Amount includes repurchase costs.
[2] | See Note 14 - Subsequent Events.

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