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Regulatory Matters - Regulatory Assets, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Regulatory assets:    
Total regulatory assets $ 240,692 $ 240,186
Less: current regulatory assets 1,850 4,276
Total regulatory assets, less current portion 238,842 235,910
Regulatory liabilities:    
Total regulatory liabilities 472,433 464,167
Less: current regulatory liabilities 2,480 3,059
Total regulatory liabilities, less current portion $ 469,953 461,108
Minimum    
Regulatory liabilities:    
Estimated service lives of assets 4 years  
Maximum    
Regulatory liabilities:    
Estimated service lives of assets 100 years  
Cost of removal    
Regulatory liabilities:    
Total regulatory liabilities $ 350,369 346,418
Future income tax benefits due to customers    
Regulatory liabilities:    
Total regulatory liabilities 87,908 88,610
Unrecognized pensions and other postretirement benefits    
Regulatory liabilities:    
Total regulatory liabilities 20,303 20,196
Revenue adjustment mechanisms    
Regulatory liabilities:    
Total regulatory liabilities 6,165 5,536
Water supply costs    
Regulatory liabilities:    
Total regulatory liabilities 4,392 0
Other    
Regulatory liabilities:    
Total regulatory liabilities 3,296 3,407
Future income tax benefits due to customers    
Regulatory assets:    
Total regulatory assets 158,793 157,669
Unrecognized pensions and other postretirement benefits    
Regulatory assets:    
Total regulatory assets 24,593 24,593
Business combinations debt premium    
Regulatory assets:    
Total regulatory assets 14,219 14,855
Employee benefit costs    
Regulatory assets:    
Total regulatory assets 9,158 9,815
Monterey Water Revenue Adjustment Mechanism    
Regulatory assets:    
Total regulatory assets 10,121 9,361
Customer Assistance Program ("CAP") balancing account    
Regulatory assets:    
Total regulatory assets 5,850 5,457
Catastrophic event memorandum accounts ("CEMA")    
Regulatory assets:    
Total regulatory assets 4,883 4,819
2022 general rate case interim memorandum account    
Regulatory assets:    
Total regulatory assets 3,266 4,571
Water supply costs    
Regulatory assets:    
Total regulatory assets 0 583
Other    
Regulatory assets:    
Total regulatory assets $ 9,809 $ 8,463