Derivative Instruments - Fair Values of Derivative Contracts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Energy Marketing Contracts Assets, Current		$ 2,787	$ 4,277
Energy Marketing Contracts Assets, Total		3,769	7,076
Energy Marketing Contract Liabilities, Current		585	704
Energy Marketing Contract Liabilities, Total		2,215	743
Designated as Hedging Instrument [Member] | Mark-to-market energy liabilities | Propane Swap Agreement
Derivatives, Fair Value [Line Items]
Energy Marketing Contract Liabilities, Current	[1]	1,810	743
Designated as Hedging Instrument [Member] | Mark-to-market energy liabilities | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Energy Marketing Contract Liabilities, Current	[1]	405	0
Designated as Hedging Instrument [Member] | Mark To Market Energy Assets | Propane Swap Agreement
Derivatives, Fair Value [Line Items]
Energy Marketing Contracts Assets, Current	[2]	3,317	7,060
Designated as Hedging Instrument [Member] | Mark To Market Energy Assets | Put Option
Derivatives, Fair Value [Line Items]
Energy Marketing Contracts Assets, Current		0	16
Designated as Hedging Instrument [Member] | Mark To Market Energy Assets | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Energy Marketing Contracts Assets, Current	[2]	$ 452	$ 0

[1] (1) Derivative liabilities, at fair value include $0.6 million and $0.7 million in current liabilities in the consolidated balance sheet at December 31, 2022 and 2021, respectively, with the remainder of the balance classified as long-term.

[2]  (1) Derivative assets, at fair value include $2.8 million and $4.3 million in current assets in the consolidated balance sheet at December 31, 2022 and 2021, respectively, with the remainder of the balance classified as long-term