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Regulatory Matters - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Regulatory matters:    
Net regulatory Assets $ 59,592,000 $ 54,679,000
Golden State Water Company and Bear Valley Electric Service Inc.    
Regulatory matters:    
Net regulatory Assets 59,600,000  
Regulatory asset 153,600,000  
Regulatory liability $ 94,000,000  
Commercial paper, term 90 days  
Regulatory asset not accruing carrying costs $ 31,800,000  
Regulatory liabilities not accruing carrying costs 90,800,000  
Golden State Water Company and Bear Valley Electric Service Inc. | Deferred Income Tax Charge    
Regulatory matters:    
Regulatory liabilities not accruing carrying costs 67,500,000  
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 23,300,000  
GSWC    
Regulatory matters:    
Net regulatory Assets 17,221,000 18,173,000
GSWC | Deferred Income Tax Charge    
Regulatory matters:    
Net regulatory Assets (63,610,000) (63,682,000)
GSWC | Pension Costs and Other Postretirement Benefit Costs    
Regulatory matters:    
Net regulatory Assets (24,115,000) (25,179,000)
BVES    
Regulatory matters:    
Net regulatory Assets 42,371,000 36,506,000
Flowed-through deferred income taxes, net | Golden State Water Company and Bear Valley Electric Service Inc.    
Regulatory matters:    
Regulatory asset not accruing carrying costs 15,700,000  
Flowed-through deferred income taxes, net | GSWC    
Regulatory matters:    
Net regulatory Assets 13,909,000 12,506,000
Derivative instrument memorandum account (Note 5)    
Regulatory matters:    
Regulatory asset not accruing carrying costs 13,100,000  
Derivative instrument memorandum account (Note 5) | BVES    
Regulatory matters:    
Net regulatory Assets 13,094,000 8,823,000
Other Regulatory assets | Golden State Water Company and Bear Valley Electric Service Inc.    
Regulatory matters:    
Regulatory asset not accruing carrying costs 3,000,000.0  
2025 general rate case memorandum accounts (unbilled revenue) | GSWC    
Regulatory matters:    
Net regulatory Assets $ 4,416,000 0
Amortization period 12 months  
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC    
Regulatory matters:    
Net regulatory Assets $ 34,494,000 37,711,000
Amortization period 36 months  
Water revenue adjustment mechanism, net of modified cost balancing account    
Regulatory matters:    
Regulatory asset recovery periods 24 months  
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC    
Regulatory matters:    
Net regulatory Assets $ 23,421,000 29,738,000
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 22,600,000  
Modified Cost Balancing account ("MCBA") | GSWC    
Regulatory matters:    
Net regulatory Assets 800,000  
2023/2024 General Rate Case Memorandum accounts ( unbilled revenue) | BVES    
Regulatory matters:    
Net regulatory Assets $ 10,036,000 9,777,000
Amortization period 36 months  
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES    
Regulatory matters:    
Net regulatory Assets $ 14,755,000 $ 14,681,000
Vegetation management and other WMP memorandum accounts | BVES | Minimum    
Regulatory matters:    
Amortization period 24 months  
Vegetation management and other WMP memorandum accounts | BVES | Maximum    
Regulatory matters:    
Amortization period 36 months