v3.25.2
Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets $ 38,001 $ 54,679
GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (3,039) 18,173
GSWC | Deferred Income Tax Charge    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (63,537) (63,682)
GSWC | Pension Costs and Other Postretirement Benefit Costs    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (24,363) (25,179)
GSWC | PFAS Contamination Litigation Proceeds Memorandum Account    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (12,500) 0
GSWC | Other regulatory liabilities    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (1,357) (608)
BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 41,040 36,506
BVES | Other regulatory liabilities    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets (4,507) (5,628)
2025 general rate case memorandum accounts (unbilled revenue) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 3,910 0
2022/2023 general rate case memorandum accounts (unbilled revenue) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 30,687 37,711
Water revenue adjustment mechanism, net of modified cost balancing account | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 18,341 29,738
Asset retirement obligations | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 7,820 7,501
Flowed-through deferred income taxes, net | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 16,139 12,506
Low income rate assistance balancing accounts | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 10,231 8,834
Other regulatory assets | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 11,590 11,352
Other regulatory assets | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 10,775 8,853
Derivative instrument memorandum account (Note 5) | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 11,244 8,823
2023/2024 General Rate Case Memorandum accounts ( unbilled revenue) | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets 9,574 9,777
Wildfire mitigation and other fire prevention related costs memorandum accounts | BVES    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Net regulatory Assets $ 13,954 $ 14,681