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Summary of Significant Accounting Policies - Advances for Construction and Contributions in Aid of Construction (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Schedule Of Estimated Refunds Of Advances For Construction [Line Items]    
Contract with customer, refund period 40 years  
Advances for construction $ 201,413 $ 155,397
Customer advances for construction, non-refundable 108,311 64,920
Customer advances for construction, refunded on service connections 34,615 31,983
Contract with customer, fair value of advances $ 51,356 $ 43,718
California    
Schedule Of Estimated Refunds Of Advances For Construction [Line Items]    
Contract with customer, refund period 40 years  
Connecticut    
Schedule Of Estimated Refunds Of Advances For Construction [Line Items]    
Contract with customer, refund period 15 years  
Maine    
Schedule Of Estimated Refunds Of Advances For Construction [Line Items]    
Contract with customer, refund period 15 years