v3.26.1
Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in regulatory assets and liabilities $ (11,802) $ (1,143)
GSWC    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in regulatory assets and liabilities (6,817) (2,767)
Pension Benefits | GSWC    
Defined Benefit Plan Disclosure [Line Items]    
Regulatory adjustment — deferred 3,000  
Pension Benefits | Water: | GSWC    
Defined Benefit Plan Disclosure [Line Items]    
Increase (decrease) in regulatory assets and liabilities $ (900) $ (300)