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Partnership's Debt (Parenthetical) (Detail) - Third Amendment - USD ($) | Jul. 30, 2015 | Sep. 30, 2016
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Debt Instrument [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 | $ 100,000,000 |
Revolving credit facility expiry | Jul. 30, 2020 |
Additional revolving credit | $ 100,000,000 |
Facility size that can be increased without consulting bank group | $ 100,000,000 |
Term loan annual payment percentage | 25.00% |
Debt instrument, effective interest rate |  | 3.62%
Minimum fixed charge coverage ratio | 110.00% |
Availability percentage to maximum facility size | 12.50% |
December through April |  |
Debt Instrument [Line Items] |  |
Commitment fee on the unused portion of the facility | 0.30% |
May through November |  |
Debt Instrument [Line Items] |  |
Commitment fee on the unused portion of the facility | 0.20% |
Maximum | Quarters ending June or September |  |
Debt Instrument [Line Items] |  |
Senior secured leverage ratio | 300.00% |
Maximum | Quarters ending December or March |  |
Debt Instrument [Line Items] |  |
Senior secured leverage ratio | 450.00% |
Quarterly |  |
Debt Instrument [Line Items] |  |
Term loan periodic payment | $ 2,500,000 |
Annually | Maximum |  |
Debt Instrument [Line Items] |  |
Term loan periodic payment | 15,000,000 |
$100 million Term Loan |  |
Debt Instrument [Line Items] |  |
Outstanding senior notes | $ 100,000,000 |
Senior secured term loan maturity period | 5 years |

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