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Components of Gas Inventory (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | $ 1.3 | $ 1.1 | $ 1.1
Liquefied Natural Gas & Other |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | 0.5 | 0.5 | 0.5
Natural Gas |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | 0.4 | 0.2 | 0.2
Propane |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | $ 0.4 | $ 0.4 | $ 0.4

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