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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]          
Increase (Decrease) in Regulatory Assets and Liabilities     $ 14,065 $ 8,319  
GSWC          
Defined Benefit Plan Disclosure [Line Items]          
Increase (Decrease) in Regulatory Assets and Liabilities     12,549 7,316  
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)     2.61%    
Expected contributions in current fiscal year 3,100   $ 3,100    
Increase (Decrease) in Regulatory Assets and Liabilities 0 $ 254 0 956  
Pension Benefits | GSWC          
Defined Benefit Plan Disclosure [Line Items]          
Regulatory adjustment — deferred (1,087)   (1,087)    
Pension Benefits | BVESI          
Defined Benefit Plan Disclosure [Line Items]          
Regulatory adjustment — deferred $ (370)   $ (370)    
Pension Benefits | Water: | GSWC          
Defined Benefit Plan Disclosure [Line Items]          
Increase (Decrease) in Regulatory Assets and Liabilities   $ 254   $ 956  
Pension Benefits | Pro Forma          
Defined Benefit Plan Disclosure [Line Items]          
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 261 Basis Point Increase In Discount Rate, Percent 28.00%   28.00%    
Sensitivity Analysis For Defined Benefit Plan, Benefit Obligation, Impact Of 261 Basis Point Increase In Discount Rate, Amount $ 73,600   $ 73,600