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Regulatory Matters - Schedule of Regulatory Liabilities and Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets $ 69,507 $ (25,454)
GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 45,729 (26,574)
GSWC | Other regulatory liabilities    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets (268) (8,815)
BVES | Other regulatory liabilities    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets (6,578) (8,005)
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 52,795 0
Water revenue adjustment mechanism, net of the modified cost balancing account | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 41,545 31,803
Asset retirement obligations (Note 1) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 7,099 6,411
COVID-19 memorandum accounts | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 1,199 3,478
Flowed-through deferred income taxes, net (Note 11)    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 4,300  
Flowed-through deferred income taxes, net (Note 11) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 3,190 (1,134)
Low income rate assistance balancing accounts | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 5,763 2,526
Pensions and other post-retirement obligations (Note 12) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets (4,867) 738
Other regulatory assets | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 9,462 10,289
Other regulatory assets | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 7,697 4,338
Excess deferred income taxes (Note 11)    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 74,000  
Excess deferred income taxes (Note 11) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets (70,189) (71,870)
Derivative instrument memorandum account (Note 5)    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 2,400  
Derivative instrument memorandum account (Note 5) | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 2,360 (11,847)
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets 17,716 13,007
Electric supply cost adjustment mechanism | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory assets $ 2,583 $ 3,627