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Summary of Significant Accounting Policies - Nonutility Properties and Real Estate Investments (Details) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Oct. 29, 2021 USD ($) property | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 31, 2023 well
Components of Real Estate Investments [Abstract] |  |  |  |  |  |  |
Land |  |  |  | $ 915,000 | $ 4,137,000 |  |
Wholesale water supply assets |  |  |  | 0 | 8,465,000 |  |
Buildings and improvements |  |  |  | 399,000 | 748,000 |  |
Subtotal |  |  |  | 1,314,000 | 13,350,000 |  |
Less: accumulated depreciation and amortization |  |  |  | 98,000 | 194,000 |  |
Total |  |  |  | 1,216,000 | 13,156,000 |  |
Impairment of long-lived asset |  |  |  | 0 | 0 |  |
Proceeds receivable from sale of real estate investments |  |  |  | 2,801,000 | 0 |  |
Number of wells acquired | well |  |  |  |  |  |  | 8
Indefinite life water rights reclassified from other intangible assets to utility plant intangible assets |  |  | $ 28,386,000 |  |  |  |
Nonutility property reclassified to utility plant |  |  | $ 11,684,000 |  |  |  |
Warehouse Building |  |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |  |
Impairment of long-lived asset | $ 0 |  |  |  |  |  |
Tennessee Properties |  |  |  |  |  |  |
Components of Real Estate Investments [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 13,170,000 |  |
Buildings and improvements |  |  |  |  | 44,950,000 |  |
Subtotal |  |  |  |  | 58,120,000 |  |
Less: accumulated depreciation and amortization |  |  |  |  | 17,270,000 |  |
Total |  |  |  |  | $ 40,850,000 |  |
Proceeds from sale of productive assets |  |  |  | 44,000,000 |  |  |
Gain (loss) on disposition of assets |  |  |  | $ (969,000) |  |  |
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 asset |  |  |  |  |  | $ 7,230,000 |
Properties selling expenses |  |  |  |  |  | 277,000 |
Deferred gains on sales of properties |  |  |  |  |  | $ 5,442,000 |
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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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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