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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets $ 29,184 $ 54,679
GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (13,874) 18,173
GSWC | Deferred Income Tax Charge    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (63,464) (63,682)
GSWC | Pension Costs and Other Postretirement Benefit Costs    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (24,578) (25,179)
GSWC | PFAS Contamination Litigation Proceeds Memorandum Account    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (12,393) 0
GSWC | Other regulatory liabilities    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (1,758) (608)
BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 43,058 36,506
BVES | Other regulatory liabilities    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (4,489) (5,628)
2025 general rate case memorandum accounts (unbilled revenue) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 2,614 0
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 25,864 37,711
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 12,752 29,738
Asset retirement obligations | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 7,981 7,501
Flowed-through deferred income taxes, net | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 18,668 12,506
Low income rate assistance balancing accounts | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 10,063 8,834
Other regulatory assets | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 10,377 11,352
Other regulatory assets | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 11,293 8,853
Derivative instrument memorandum account (Note 5) | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 14,275 8,823
2023/2024 General Rate Case Memorandum accounts ( unbilled revenue) | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 8,949 9,777
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets $ 13,030 $ 14,681