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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 11, 2017 | Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Subsequent Event [Line Items] |  |  |  |
Letters of credit issued and outstanding |  |  | $ 48.0 | $ 50.6
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash deposit in support of liability | $ 34.2 |  |  |
Decrease in outstanding letters of credit | 36.6 |  |  |
Letters of credit issued and outstanding | $ 11.4 |  |  |
Subsequent Event | Dividend Declared |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Distribution declared |  | $ 0.11 |  |
Partners capital projected distribution amount on annualized basis |  | 0.44 |  |
Minimum dividend distribution per unit |  | $ 0.0675 |  |
Percentage of distributions to common unit holders in excess of minimum quarterly distribution |  | 90.00% |  |
Percentage of distributions to general unit holders in excess of minimum quarterly distribution |  | 10.00% |  |
Amount to paid to common unit holders |  | $ 6.1 |  |
Amount to paid to the General Partner |  | 0.2 |  |
Incentive distribution to the General Partner |  | 0.1 |  |
Incentive distributions to management |  | $ 0.1 |  |
Dividend payable date |  | Oct. 31, 2017 |  |
Dividend record date |  | Oct. 23, 2017 |  |

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