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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 238,352 $ 222,474 $ 597,337 $ 529,804
Total operating revenue 256,723 304,108 617,583 605,155
Total non-regulated revenue 5,813 3,934 16,759 11,969
Regulated Water and WasteWater Services        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 238,352 222,474 597,337 529,804
Regulatory balancing account revenue 18,371 81,634 20,246 75,351
Total operating revenue 256,723 304,108 617,583 605,155
Residential        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 164,311 151,938 400,653 360,935
Business        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 43,450 36,951 106,902 93,175
Industrial        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 7,347 7,496 19,409 21,996
Public authorities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 14,126 12,862 30,886 26,470
Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9,118 13,227 39,487 27,228
Operating and maintenance revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 4,110 2,680 12,122 7,969
Other non-regulated revenue        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 894 625 2,550 2,223
Non-Regulated Services        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 5,004 3,305 14,672 10,192
Lease revenue 809 629 2,087 1,777
Total non-regulated revenue $ 5,813 $ 3,934 $ 16,759 $ 11,969