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Summary of Significant Accounting Policies - Real Estate Investments and Nonutility Properties (Details) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 29, 2021 USD ($) property | Jun. 29, 2021 USD ($) | Sep. 28, 2020 USD ($) property | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Components of Real Estate Investments [Abstract] |  |  |  |  |  |  |
Land |  |  |  | $ 12,615 | $ 14,168 |  |
Buildings and improvements |  |  |  | 45,017 | 43,961 |  |
Total real estate investment |  |  |  | 57,632 | 58,129 |  |
Sales agreement, holdback amount |  |  |  |  |  |  | $ 3,000
Gain on sale of properties |  | $ 3,000 |  | 3,000 | 0 | $ 0 |
Gain on sale of real estate investments |  |  |  | 927 | 948 | $ 929 |
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |
2022 |  |  |  | 4,251 |  |  |
2023 |  |  |  | 4,230 |  |  |
2024 |  |  |  | 2,990 |  |  |
2025 |  |  |  | 2,912 |  |  |
2026 |  |  |  | 3,075 |  |  |
Thereafter |  |  |  | 4,753 |  |  |
Land and Building |  |  |  |  |  |  |
Assets Leased or Available for Lease [Abstract] |  |  |  |  |  |  |
Assets leased or available for lease |  |  |  | $ 58,330 | $ 57,273 |  |
SJWC |  |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |  |
Gain on sale of properties | $ 7,230 |  |  |  |  |  |
Number of properties sold | property | 2 |  | 6 |  |  |  |
Proceeds from sale of real estate held-for-investment | $ 13,150 |  | $ 1,075 |  |  |  |
Properties selling expenses | 277 |  |  |  |  |  |
Deferred gains on sales of properties | 5,442 |  |  |  |  |  |
Proceeds from sale of land held-for-investment | 2,600 |  |  |  |  |  |
Gain on sale of real estate investments | 927 |  | 1,048 |  |  |  |
Real estate selling expenses | $ 121 |  | $ 22 |  |  |  |
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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