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Regulatory Matters - Schedule of Regulatory Assets, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Regulatory assets:    
Total regulatory assets $ 254,862 $ 242,227
Less: current regulatory asset 8,315 18,172
Total regulatory assets, less current portion 246,547 224,055
Regulatory liabilities:    
Total regulatory liabilities 546,797 484,841
Less: current regulatory liabilities 0 1,122
Total regulatory liabilities, less current portion $ 546,797 483,719
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 $ 394,391 364,398
Future income tax benefits due to customers    
Regulatory liabilities:    
Total regulatory liabilities 82,285 84,128
Unrecognized pensions and other postretirement benefits    
Regulatory liabilities:    
Total regulatory liabilities 32,996 27,872
PFAS Legal Settlement Proceeds    
Regulatory liabilities:    
Total regulatory liabilities 24,682 0
Employee benefit costs    
Regulatory liabilities:    
Total regulatory liabilities 8,771 1,137
Revenue adjustment mechanisms    
Regulatory liabilities:    
Total regulatory liabilities 0 1,122
Water supply costs    
Regulatory liabilities:    
Total regulatory liabilities 0 3,386
Other    
Regulatory liabilities:    
Total regulatory liabilities 3,672 2,798
Future income tax benefits due to customers    
Regulatory assets:    
Total regulatory assets 204,384 180,103
MWRAM    
Regulatory assets:    
Total regulatory assets 8,553 9,985
Business combinations debt premium    
Regulatory assets:    
Total regulatory assets 9,772 12,313
Employee benefit costs    
Regulatory assets:    
Total regulatory assets 5,823 6,370
Catastrophic event memorandum accounts (“CEMA”)    
Regulatory assets:    
Total regulatory assets 127 986
Revenue adjustment mechanisms    
Regulatory assets:    
Total regulatory assets 7,931 5,024
Customer Assistance Program (“CAP”) balancing account    
Regulatory assets:    
Total regulatory assets 3,696 6,599
Water supply costs    
Regulatory assets:    
Total regulatory assets 847 0
Unrecognized pensions and other postretirement benefits    
Regulatory assets:    
Total regulatory assets 0 3,177
2022 general rate case interim memorandum account    
Regulatory assets:    
Total regulatory assets 0 3,392
Other    
Regulatory assets:    
Total regulatory assets $ 13,729 $ 14,278