v3.25.2
Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Increase (decrease) in regulatory assets and liabilities     $ (11,417) $ 3,001
GSWC        
Defined Benefit Plan Disclosure [Line Items]        
Increase (decrease) in regulatory assets and liabilities     (13,175) 3,602
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets, contributions by employer     3,400  
Pension Benefits | GSWC        
Defined Benefit Plan Disclosure [Line Items]        
Regulatory adjustment — deferred $ 1,300   1,300  
Pension Benefits | Water: | GSWC        
Defined Benefit Plan Disclosure [Line Items]        
Increase (decrease) in regulatory assets and liabilities $ (400) $ (100) $ (800) $ (300)