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Summary of Significant Accounting Policies - Components of Gas Inventory (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Public Utilities, Inventory [Line Items] |  |
Weighted average cost inventory amount | $ 1.1 | $ 1.0
Liquefied Natural Gas & Other |  |
Public Utilities, Inventory [Line Items] |  |
Weighted average cost inventory amount | 0.5 | 0.4
Natural Gas |  |
Public Utilities, Inventory [Line Items] |  |
Weighted average cost inventory amount | 0.2 | 0.3
Propane |  |
Public Utilities, Inventory [Line Items] |  |
Weighted average cost inventory amount | $ 0.4 | $ 0.3

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