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Summary of Significant Accounting Policies - Nonutility Properties and Real Estate Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Components of Real Estate Investments [Abstract] |  |
Land | $ 914 | $ 915
Wholesale water supply assets | 0 | 0
Buildings and improvements | 769 | 399
Subtotal | 1,683 | 1,314
Less: accumulated depreciation and amortization | 103 | 98
Net nonutility properties | $ 1,580 | $ 1,216
Building and Building Improvements | Minimum |  |
Components of Real Estate Investments [Abstract] |  |
Estimated useful life | 7 years |
Building and Building Improvements | Maximum |  |
Components of Real Estate Investments [Abstract] |  |
Estimated useful life | 39 years |

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