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Summary of Significant Accounting Policies - Nonutility Properties and Real Estate Investments (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Oct. 29, 2021 USD ($) property | Jun. 29, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($)
Components of Real Estate Investments [Abstract] |  |  |  |  |  |  |
Land |  |  |  | $ 4,137,000 | $ 12,615,000 |  |
Wholesale water supply assets |  |  |  | 8,465,000 | 0 |  |
Buildings and improvements |  |  |  | 748,000 | 45,418,000 |  |
Real Estate Investment Property, at Cost, Total |  |  |  | 13,350,000 | 58,033,000 |  |
Less accumulated depreciation and amortization |  |  |  | 194,000 | 17,158,000 |  |
Net nonutility properties and real estate investments |  |  |  | 13,156,000 | 40,875,000 |  |
Impairment of long-lived asset |  |  |  | 0 | 0 | $ 2,211,000 |
Gain on sale of properties |  |  | $ 3,000,000 |  |  |  |
Sales agreement, holdback amount |  |  |  |  |  |  | $ 3,000,000
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
2024 |  |  |  | 4,758,000 |  |  |
2025 |  |  |  | 5,063,000 |  |  |
2026 |  |  |  | 5,290,000 |  |  |
2027 |  |  |  | 3,990,000 |  |  |
2028 |  |  |  | 1,679,000 |  |  |
Thereafter |  |  |  | 0 |  |  |
Warehouse Building |  |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 13,170,000 |  |  |
Buildings and improvements |  |  |  | 44,950,000 |  |  |
Real Estate Investment Property, at Cost, Total |  |  |  | 58,120,000 |  |  |
Less accumulated depreciation and amortization |  |  |  | 17,270,000 |  |  |
Net nonutility properties and real estate investments |  |  |  | $ 40,850,000 |  |  |
Impairment of long-lived asset | $ 0 |  |  |  |  |  |
SJWC |  |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |  |
Number of properties sold | property |  | 2 |  |  |  |  |
Proceeds from sale of real estate held-for-investment |  | $ 13,150,000 |  |  |  |  |
Gain on sale of properties |  |  |  |  | 7,230,000 |  |
Properties selling expenses |  |  |  |  | 277,000 |  |
Deferred gains on sales of properties |  |  |  |  | $ 5,442,000 |  |
Proceeds from sale of land held-for-investment |  | 2,600,000 |  |  |  |  |
Gain on sale of real estate investments |  | 927,000 |  |  |  |  |
Real estate selling expenses |  | $ 121,000 |  |  |  |  |
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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