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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Sep. 30, 2016
Business Acquisition [Line Items]
Goodwill	$ 213,733	$ 212,760
Heating Oil Dealer, Propane Dealer and Plumbing Service Provider
Business Acquisition [Line Items]
Aggregate purchase prices partnership acquired	7,300
Cash paid	5,800
Deferred liability	1,500
Contingent consideration	600
Aggregate purchase price allocation, intangible assets	2,700
Goodwill	1,000
Aggregate purchase price allocation, fixed assets	3,700
Gross purchase price reduced by working capital credits	$ (100)

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Working Capital

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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