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Regulatory Matters - Narrative (Details) - USD ($)
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Regulatory matters:    
Net regulatory Assets $ 75,061,000 $ 69,507,000
Golden State Water Company and Bear Valley Electric Service Inc.    
Regulatory matters:    
Net regulatory Assets 75,100,000  
Regulatory asset 157,800,000  
Regulatory liability $ 82,700,000  
Commercial paper, term 90 days  
Regulatory asset not accruing carrying costs $ 23,200,000  
Regulatory liabilities not accruing carrying costs 77,800,000  
Golden State Water Company and Bear Valley Electric Service Inc. | Deferred Income Tax Charge    
Regulatory matters:    
Regulatory liabilities not accruing carrying costs 73,000,000.0  
Golden State Water Company and Bear Valley Electric Service Inc. | Pension Costs and Other Postretirement Benefit Costs    
Regulatory matters:    
Regulatory liabilities not accruing carrying costs 3,300,000  
GSWC    
Regulatory matters:    
Net regulatory Assets 44,803,000 45,729,000
GSWC | Deferred Income Tax Charge    
Regulatory matters:    
Net regulatory Assets (69,257,000) (70,189,000)
GSWC | Pension Costs and Other Postretirement Benefit Costs    
Regulatory matters:    
Net regulatory Assets (4,824,000) (4,867,000)
BVES    
Regulatory matters:    
Regulatory Asset -incremental vegetation management costs 13,900,000  
Regulatory asset- wildfire mitigation plans (WMP) 7,000,000  
Flowed-through deferred income taxes, net | Golden State Water Company and Bear Valley Electric Service Inc.    
Regulatory matters:    
Regulatory asset not accruing carrying costs 10,700,000  
Flowed-through deferred income taxes, net | GSWC    
Regulatory matters:    
Net regulatory Assets 8,919,000 3,190,000
Derivative instrument memorandum account (Note 5)    
Regulatory matters:    
Regulatory asset not accruing carrying costs 8,300,000  
Derivative instrument memorandum account (Note 5) | BVES    
Regulatory matters:    
Net regulatory Assets 8,320,000 2,360,000
Other Regulatory assets | Golden State Water Company and Bear Valley Electric Service Inc.    
Regulatory matters:    
Regulatory asset not accruing carrying costs 4,200,000  
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC    
Regulatory matters:    
Net regulatory Assets $ 41,656,000 52,795,000
Amortization period 36 months  
Water revenue adjustment mechanism, net of modified cost balancing account    
Regulatory matters:    
Increase (decrease) in other regulatory assets $ 16,000,000.0  
Regulatory asset recovery periods 24 months  
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC    
Regulatory matters:    
Net regulatory Assets $ 44,092,000 $ 41,545,000
Regulatory asset recovery periods 18 months  
Water Revenue Adjustment Mechanism ("WRAM")    
Regulatory matters:    
Deferred revenue, revenue recognized $ 0  
Water Revenue Adjustment Mechanism ("WRAM") | GSWC    
Regulatory matters:    
Net regulatory Assets 47,400,000  
Modified Cost Balancing account ("MCBA") | GSWC    
Regulatory matters:    
Net regulatory Assets $ (3,300,000)