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Derivative Instruments - Fair Values of Derivative Contracts Recorded in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Derivatives, Fair Value [Line Items] |  |  |
Energy Marketing Contracts Assets, Current |  | $ 0.3 | $ 0.6
Energy Marketing Contract Liabilities, Current |  | 0.2 | 0.0
Energy Marketing Contract Liabilities, Total | [1] | 1.4 | 0.1
Energy Marketing Contracts Assets, Total | [2] | 0.4 | 0.7
Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member] | Derivatives designated as hedging instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Energy Marketing Contracts Assets, Current |  | 0.3 | 0.6
Mark To Market Energy Assets [Member] | Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Energy Marketing Contracts Assets, Current |  | 0.1 | 0.1
Mark-to-market energy liabilities [Member] | Propane Swap Agreement [Member] | Derivatives designated as hedging instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Energy Marketing Contract Liabilities, Current |  | 0.1 | 0.0
Mark-to-market energy liabilities [Member] | Interest Rate Swap [Member] | Derivatives designated as hedging instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Energy Marketing Contract Liabilities, Current |  | $ 1.3 | $ 0.1
[1] | (1) Derivative liabilities, at fair value, include $0.2 million in current liabilities in the condensed consolidated balance sheet at June 30, 2025 and no current derivative liabilities at December 31, 2024, with the remainder of the balances classified as long-term.
[2] | (1) Derivative assets, at fair value, include $0.3 million in current assets in the condensed consolidated balance sheet at June 30, 2025 and $0.6 million at December 31, 2024, with the remainder of the balances classified as long-term

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- Definition Energy Marketing Contracts Assets, Total + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Carrying amount as of the balance sheet date of the asset arising from energy trading activities that involves the purchase and sale of energy under forward contracts at fixed and variable prices and the buying and selling of financial energy contracts that include exchange futures and options and over the counter options and swaps, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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