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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | $ 77,667 | $ (25,454)
GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 60,866 | (26,574)
GSWC | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (280) | (9,949)
BVES | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (8,180) | (8,005)
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 55,140 | 0
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 46,597 | 31,803
COVID-19 memorandum accounts | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 3,543 | 3,478
Excess deferred income taxes | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (70,515) | (71,870)
Other regulatory assets | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 26,381 | 19,964
Other regulatory assets | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | 10,136 | 7,965
Derivative instrument memorandum account (Note 5) | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | (1,525) | (11,847)
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net regulatory Assets | $ 16,370 | $ 13,007

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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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