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Regulatory Matters - Regulatory Assets, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Regulatory assets:    
Total regulatory assets $ 243,174 $ 242,227
Less: current regulatory assets 16,572 18,172
Total regulatory assets, less current portion 226,602 224,055
Regulatory liabilities:    
Total regulatory liabilities 494,530 484,841
Less: current regulatory liabilities 573 1,122
Total regulatory liabilities, less current portion $ 493,957 483,719
Minimum    
Regulatory assets:    
Estimated service lives of assets 5 years  
Maximum    
Regulatory assets:    
Estimated service lives of assets 100 years  
Cost of removal    
Regulatory liabilities:    
Total regulatory liabilities $ 372,029 364,398
Future income tax benefits due to customers    
Regulatory liabilities:    
Total regulatory liabilities 83,670 84,128
Unrecognized pensions and other postretirement benefits    
Regulatory liabilities:    
Total regulatory liabilities 27,782 27,872
Water supply costs    
Regulatory liabilities:    
Total regulatory liabilities 4,726 3,386
Employee benefit costs    
Regulatory liabilities:    
Total regulatory liabilities 3,028 1,137
Revenue adjustment mechanisms    
Regulatory liabilities:    
Total regulatory liabilities 573 1,122
Other    
Regulatory liabilities:    
Total regulatory liabilities 2,722 2,798
Future income tax benefits due to customers    
Regulatory assets:    
Total regulatory assets 181,282 180,103
Monterey Water Revenue Adjustment Mechanism    
Regulatory assets:    
Total regulatory assets 13,032 9,985
Business combinations debt premium    
Regulatory assets:    
Total regulatory assets 11,678 12,313
Employee benefit costs    
Regulatory assets:    
Total regulatory assets 6,262 6,370
Revenue adjustment mechanisms    
Regulatory assets:    
Total regulatory assets 5,766 5,024
Customer Assistance Program ("CAP") balancing account    
Regulatory assets:    
Total regulatory assets 5,717 6,599
2022 general rate case interim memorandum account    
Regulatory assets:    
Total regulatory assets 2,249 3,392
Unrecognized pensions and other postretirement benefits    
Regulatory assets:    
Total regulatory assets 1,506 3,177
Other    
Regulatory assets:    
Total regulatory assets $ 15,682 $ 15,264