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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | $ 17,626 | $ (25,454)
GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | 9,249 | (26,574)
GSWC | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | (13,198) | (8,815)
BVES | Other regulatory liabilities |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | (8,565) | (8,005)
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | 38,419 | 0
Water revenue adjustment mechanism, net of the modified cost balancing account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | 29,069 | 31,803
COVID-19 memorandum account | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | 3,540 | 3,478
Excess deferred income taxes | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | (71,418) | (71,870)
Flowed-through income taxes | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | 447 | (1,134)
Other regulatory assets | GSWC |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | 22,390 | 19,964
Other regulatory assets | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | 9,480 | 7,965
Derivative instrument memorandum account (Note 5) | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | (6,669) | (11,847)
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Net Regulatory assets | $ 14,131 | $ 13,007

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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