Derivative Instruments - Fair Values of Derivative Contracts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Energy Marketing Contracts Assets, Current		$ 1,027	$ 2,787
Energy Marketing Contracts Assets, Total		1,067	3,769
Energy Marketing Contract Liabilities, Current		354	585
Energy Marketing Contract Liabilities, Total		1,281	2,215
Designated as Hedging Instrument [Member] | Mark-to-market energy liabilities | Propane Swap Agreement
Derivatives, Fair Value [Line Items]
Energy Marketing Contract Liabilities, Current	[1]	1,078	1,810
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]	203	405
Designated as Hedging Instrument [Member] | Mark To Market Energy Assets | Propane Swap Agreement
Derivatives, Fair Value [Line Items]
Energy Marketing Contracts Assets, Current	[2]	702	3,317
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]	$ 365	$ 452

[1] (1) Derivative liabilities, at fair value include $0.4 million and $0.6 million in current liabilities in the consolidated balance sheet at December 31, 2023 and 2022, respectively, with the remainder of the balance classified as long-term.

[2]  (1) Derivative assets, at fair value include $1.0 million and $2.8 million in current assets in the consolidated balance sheet at December 31, 2023 and 2022, respectively, with the remainder of the balance classified as long-term