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Components of Gas Inventory (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | $ 0.3 | $ 1.0 | $ 0.8
Liquefied Natural Gas & Other |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | 0.1 | 0.4 | 0.1
Natural Gas |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | 0.0 | 0.3 | 0.4
Propane |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Weighted average cost inventory amount | $ 0.2 | $ 0.3 | $ 0.3

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