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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | $ 80,052 | $ 69,507
GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 53,314 | 45,729
GSWC | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (510) | (268)
BVES | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (7,677) | (6,578)
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 46,527 | 52,795
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 50,842 | 41,545
Deferred Income Tax Charge [Member] | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (69,567) | (70,189)
Other regulatory assets | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 10,018 | 10,661
Other regulatory assets | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 8,181 | 7,697
Derivative instrument memorandum account (Note 5) | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 5,593 | 2,360
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 19,864 | 17,716
Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (4,828) | (4,867)
Low income rate assistance balancing accounts | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 7,747 | 5,763
Asset retirement obligations | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 7,418 | 7,099
Electric Supply Cost Adjustment Mechanism | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 777 | 2,583
Flowed-through deferred income taxes, net | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 5,667 | $ 3,190
Water Revenue Adjustment Mechanism ("WRAM") | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | $ 54,600 |

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- Definition Schedule of Regulatory Assets and Liabilities [Line Items] + References No definition available. + Details
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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//1943274/2147481878/980-340-50-1 + Details
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