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Regulatory Matters - Schedule of Regulatory Liabilities and Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | $ 54,679 | $ 69,507
GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 18,173 | 45,729
GSWC | Excess deferred income taxes (Note 11) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liability | (63,682) | (70,189)
GSWC | Pensions and other post-retirement obligations (Note 12) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liability | (25,179) | (4,867)
GSWC | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liability | (608) | (268)
GSWC | 2022/2023 general rate case memorandum accounts (unbilled revenue) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 37,711 | 52,795
Net regulatory assets | 37,700 |
GSWC | Water revenue adjustment mechanism, net of the modified cost balancing account |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 29,738 | 41,545
Net regulatory assets | 29,700 |
GSWC | Asset retirement obligations (Note 1) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 7,501 | 7,099
GSWC | Flowed-through deferred income taxes, net (Note 11) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 12,506 | 3,190
GSWC | Low income rate assistance balancing accounts |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 8,834 | 5,763
GSWC | Other Regulatory Assets |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 11,352 | 10,661
BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory assets | 36,506 | 23,778
BVES | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory liability | (5,628) | (6,578)
BVES | Other Regulatory Assets |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 8,853 | 10,280
BVES | 2023/2024 general rate case memorandum accounts (unbilled revenue) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 9,777 | 0
Net regulatory assets | 9,800 |
BVES | Derivative instrument memorandum account (Note 5) |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | 8,823 | 2,360
BVES | Wildfire mitigation and other fire prevention related costs memorandum accounts |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory assets | $ 14,681 | $ 17,716

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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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