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Regulatory Matters - Regulatory Assets, Net (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Regulatory assets:    
Total regulatory assets $ 249,423 $ 242,227
Less: current regulatory assets 7,047 18,172
Total regulatory assets, less current portion 242,376 224,055
Regulatory liabilities:    
Total regulatory liabilities 528,209 484,841
Less: current regulatory liabilities 3 1,122
Total regulatory liabilities, less current portion $ 528,206 483,719
Minimum    
Regulatory liabilities:    
Estimated service lives of assets 5 years  
Maximum    
Regulatory liabilities:    
Estimated service lives of assets 100 years  
Cost of removal    
Regulatory liabilities:    
Total regulatory liabilities $ 387,169 364,398
Future income tax benefits due to customers    
Regulatory liabilities:    
Total regulatory liabilities 82,349 84,128
Unrecognized pensions and other postretirement benefits    
Regulatory liabilities:    
Total regulatory liabilities 27,608 27,872
PFAS legal settlement proceeds    
Regulatory liabilities:    
Total regulatory liabilities 20,986 0
Employee benefit costs    
Regulatory liabilities:    
Total regulatory liabilities 6,850 1,137
Water supply costs    
Regulatory liabilities:    
Total regulatory liabilities 605 3,386
Revenue adjustment mechanisms    
Regulatory liabilities:    
Total regulatory liabilities 89 1,122
Other    
Regulatory liabilities:    
Total regulatory liabilities 2,553 2,798
Future income tax benefits due to customers    
Regulatory assets:    
Total regulatory assets 196,072 180,103
Monterey Water Revenue Adjustment Mechanism (“MWRAM”)    
Regulatory assets:    
Total regulatory assets 9,660 9,985
Business combinations debt premium    
Regulatory assets:    
Total regulatory assets 10,407 12,313
Employee benefit costs    
Regulatory assets:    
Total regulatory assets 6,008 6,370
Revenue adjustment mechanisms    
Regulatory assets:    
Total regulatory assets 8,670 5,024
Customer Assistance Program ("CAP") balancing account    
Regulatory assets:    
Total regulatory assets 4,281 6,599
Unrecognized pensions and other postretirement benefits    
Regulatory assets:    
Total regulatory assets 1,506 3,177
2022 general rate case interim memorandum account    
Regulatory assets:    
Total regulatory assets 0 3,392
Other    
Regulatory assets:    
Total regulatory assets $ 12,819 $ 15,264