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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]          
Increase (Decrease) in Regulatory Assets and Liabilities     $ 8,404 $ 8,802  
GSWC          
Defined Benefit Plan Disclosure [Line Items]          
Increase (Decrease) in Regulatory Assets and Liabilities     8,035 8,489  
Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate         2.89%
Defined Benefit Plan, Benefit Obligation $ 259,800   $ 259,800    
'Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate, Increase (Decrease)     1.86%    
Expected contributions in current fiscal year 3,100   $ 3,100    
Increase (Decrease) in Regulatory Assets and Liabilities 0 $ 351 0 702  
Pension Benefits | GSWC          
Defined Benefit Plan Disclosure [Line Items]          
Regulatory adjustment — deferred (635)   (635)    
Pension Benefits | BVESI          
Defined Benefit Plan Disclosure [Line Items]          
Regulatory adjustment — deferred $ (246)   $ (246)    
Pension Benefits | Water Service Utility Operations [Member] | GSWC          
Defined Benefit Plan Disclosure [Line Items]          
Increase (Decrease) in Regulatory Assets and Liabilities   $ 351   $ 702  
Pension Benefits | Pro Forma          
Defined Benefit Plan Disclosure [Line Items]          
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 86 Basis Point Increase In Discount Rate, Percent 22.00%   22.00%    
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 89 Basis Point Increase In Discount Rate, Amount $ 58,200   $ 58,200