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Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Regulatory Assets and Liabilities    
Total Regulatory Assets $ 293,263 $ 283,620
Total Regulatory Liabilities 213,350 213,679
Future tax benefits due to customers    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 131,155 131,155
Pension and retiree group health    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 58,678 58,678
PCBA    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 1,999 0
HCBA    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 15,312 14,318
CEBA    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 860 6,036
Net WRAM and MCBA long-term payable    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 262 172
Other components of net periodic benefit cost    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 4,059 2,475
Other regulatory liabilities    
Regulatory Assets and Liabilities    
Total Regulatory Liabilities 1,025 845
Retiree group health    
Regulatory Assets and Liabilities    
Total Regulatory Assets 0 171
Future tax benefits due to customers    
Regulatory Assets and Liabilities    
Total Regulatory Assets 143,546 143,546
Other accrued benefits    
Regulatory Assets and Liabilities    
Total Regulatory Assets 25,974 24,946
Net WRAM and MCBA long-term accounts receivable    
Regulatory Assets and Liabilities    
Total Regulatory Assets 49,243 41,558
Asset retirement obligations, net    
Regulatory Assets and Liabilities    
Total Regulatory Assets 25,335 24,548
Interim rates memorandum account (IRMA) long-term accounts receivable    
Regulatory Assets and Liabilities    
Total Regulatory Assets 3,533 3,682
Tank coating    
Regulatory Assets and Liabilities    
Total Regulatory Assets 16,507 16,395
Recoverable property losses    
Regulatory Assets and Liabilities    
Total Regulatory Assets 2,998 3,144
PCBA    
Regulatory Assets and Liabilities    
Total Regulatory Assets $ 19,233 19,091
General district balancing account receivable    
Regulatory Assets and Liabilities    
Recovery Period 1 year  
Total Regulatory Assets $ 383 377
Customer assistance program (CAP) and Rate support fund (RSF) accounts receivable    
Regulatory Assets and Liabilities    
Recovery Period 1 year  
Total Regulatory Assets $ 3,402 2,965
Other regulatory assets    
Regulatory Assets and Liabilities    
Total Regulatory Assets $ 3,109 $ 3,197
Minimum | Interim rates memorandum account (IRMA) long-term accounts receivable    
Regulatory Assets and Liabilities    
Recovery Period 1 year  
Maximum | Interim rates memorandum account (IRMA) long-term accounts receivable    
Regulatory Assets and Liabilities    
Recovery Period 2 years