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Business Combinations - Additional Information (Detail) $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) PartnershipUnit	Sep. 30, 2018 USD ($) PartnershipUnit	Sep. 30, 2017 USD ($) PartnershipUnit
Business Acquisition [Line Items]
Number of businesses acquired | PartnershipUnit											6	7
Goodwill	$ 244,574				$ 228,436				$ 228,436	$ 244,574	$ 228,436	$ 225,915
Total sales	235,887	$ 283,376	$ 699,582	$ 535,027	229,618	$ 327,354	$ 684,031	$ 436,834		1,753,872	1,677,837	1,323,555
Net earnings before income taxes	(46,545)	$ (33,153)	$ 101,564	$ 3,288	(36,925)	$ (11,421)	$ 82,783	$ 28,670	34,400	$ 25,154	63,107	47,276
Liquid Product Dealers
Business Acquisition [Line Items]
Number of businesses acquired | PartnershipUnit										3
Acquired Business
Business Acquisition [Line Items]
Aggregate purchase price partnership acquired										$ 60,904
Goodwill	16,138									16,138
Total sales										25,200
Net earnings before income taxes										1,700
Aggregate purchase price allocation, fixed assets	$ 13,676									$ 13,676
Acquired Business | Customer Lists, Other Intangibles and Trade Names | Minimum
Business Acquisition [Line Items]
Intangible assets, amortization period										10 years
Acquired Business | Customer Lists, Other Intangibles and Trade Names | Maximum
Business Acquisition [Line Items]
Intangible assets, amortization period										20 years
Acquired Business | General and Administrative Expenses
Business Acquisition [Line Items]
Total acquisition expenses										$ 1,200
Heating Oil Dealer and Motor Fuel Dealer
Business Acquisition [Line Items]
Aggregate purchase price partnership acquired											25,200
Cash paid											23,700
Deferred liabilities											1,500
Aggregate purchase price allocation, intangible assets					15,300				15,300		15,300
Aggregate purchase price allocation, fixed assets					7,500				7,500		7,500
Gross purchase price increased (reduced) by working capital credits					$ 2,400				$ 2,400		$ 2,400
Heating Oil Dealer, Propane Dealer and Plumbing Service Provider
Business Acquisition [Line Items]
Aggregate purchase price partnership acquired												44,800
Cash paid												43,300
Deferred liabilities												1,500
Aggregate purchase price allocation, intangible assets												37,500
Aggregate purchase price allocation, fixed assets												10,200
Gross purchase price increased (reduced) by working capital credits												(2,900)
Contingent consideration												$ 600

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