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Business Combinations - Additional Information (Detail) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2017 USD ($) PartnershipUnit | Sep. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |
Goodwill | $ 215,262 | $ 212,760
Number of heating oil dealer acquired | PartnershipUnit | 3 |
Heating Oil Dealer, Propane Dealer and Plumbing Service Provider |  |
Business Acquisition [Line Items] |  |
Aggregate purchase prices partnership acquired | $ 16,000 |
Cash paid | 14,500 |
Deferred liabilities | 1,500 |
Contingent consideration | 600 |
Aggregate purchase price allocation, intangible assets | 9,300 |
Goodwill | 2,500 |
Aggregate purchase price allocation, fixed assets | 5,000 |
Gross purchase price reduced by working capital credits | $ (800) |

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