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Regulatory Rate Filings (Details) - USD ($)
 3 Months Ended
Mar. 16, 2021
Mar. 01, 2021
Feb. 25, 2021
Jan. 29, 2021
Jan. 15, 2021
Jan. 05, 2021
Dec. 01, 2020
Nov. 23, 2020
Oct. 28, 2020
Jun. 17, 2020
Jun. 30, 2022
Mar. 31, 2021
Mar. 10, 2021
Mar. 03, 2021
Feb. 01, 2021
Jan. 04, 2021
Nov. 16, 2020
San Jose Water Company | General Rate Case No. 21-01-003                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory rate filings, requested rate increase, year one                               $ 51,585,000 $ 11,750,000
Regulatory rate filings, requested rate increase as percentage of total revenue at time of request, year one                               13.35% 3.04%
Regulatory rate filings, requested rate increase, year two                               $ 16,932,000  
Regulatory rate filings, proposed rate increase, percent of authorized revenue, year two                               3.88%  
Regulatory rate filings, requested rate increase, year three                               $ 19,195,000  
Regulatory rate filings, requested rate increase, percent of authorized revenue, year three                               4.24%  
Regulatory rate filings, balancing and memorandum account, requested recovery (refund)                               $ 18,499,000  
Regulatory rate filings, requested authorization for capital budget, amount                               $ 435,000,000  
San Jose Water Company And Three Other California Water Utilities | Cost of Capital Filings                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory rate filings, requested deferment period           1 year                      
Connecticut Water Company                                  
Public Utilities, General Disclosures [Line Items]                                  
Public utilities, requested rate increase (decrease), amount                 $ 956,000                
Requested WICA surcharge, percentage                 6.94%         7.03%      
Authorized WICA surcharge, percentage                       5.75%          
Regulatory rate filings, requested increase in revenues         $ 20,206,000                        
Requested increase in revenues, completed infrastructure investments not currently in approved rates and surcharges         $ 265,514,000                        
Regulatory rate filings, requested reduction in water bills for income-eligible customers         15.00%                        
Regulatory rate filings, requested authorization for debt issuance, approval period 60 days                                
Connecticut Water Company | Maximum                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory rate filings, requested authorization for debt issuance $ 100,000,000                                
Connecticut Water Company | WICA                                  
Public Utilities, General Disclosures [Line Items]                                  
Requested WICA surcharge increase (decrease), percentage                 1.11%           0.09%    
Avon Water Company                                  
Public Utilities, General Disclosures [Line Items]                                  
Authorized WICA surcharge, percentage                       9.31%          
SJWTX, Inc.                                  
Public Utilities, General Disclosures [Line Items]                                  
Authorized regulatory surcharge, per thousand gallons   $ 0.7 $ 1.84 $ 0.95     $ 2.02                    
Authorized regulatory base charge, per residential account     $ 0.51                            
Maine Water Company                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory rate filings, requested rate increase, year one                         $ 6,659,000        
Regulatory rate filings, requested rate increase as percentage of total revenue at time of request, year one                         77.50%        
Public utilities, requested rate increase (decrease), amount               $ 304,000                  
Approved rate increase (decrease)                   $ 198,000              
Approved rate increase (decrease), step increase 1                   9.80%              
Approved rate increase (decrease), step increase 2                   3.51%              
Approved rate increase (decrease)                   13.31%              
Maine Water Company | Forecast                                  
Public Utilities, General Disclosures [Line Items]                                  
Regulatory rate filings, requested project replacement value                     $ 60,000,000            
Maine Water Company | Minimum                                  
Public Utilities, General Disclosures [Line Items]                                  
Requested WISC surcharge increase (decrease), percentage               1.10%                  
Maine Water Company | Maximum                                  
Public Utilities, General Disclosures [Line Items]                                  
Requested WISC surcharge increase (decrease), percentage               5.00%