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Summary of Significant Accounting Policies (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 27, 2024
USD ($)
May 31, 2025
USD ($)
shares
Sep. 30, 2025
USD ($)
state
contract
shares
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2024
USD ($)
shares
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
customer
registrant
contract
state
shares
Sep. 30, 2024
USD ($)
shares
May 29, 2025
USD ($)
Mar. 13, 2025
USD ($)
Feb. 12, 2025
USD ($)
Dec. 31, 2024
USD ($)
Summary of significant accounting policies                            
Number of customers | customer                 1,000,000          
Number of states in which entity operates | state     10           10          
Property installed by developers and conveyed                 $ 17,514 $ 4,971        
Number of registrants filing combined report | registrant                 2          
Issuance of Common Shares from an at-the-market offering program, net of issuance costs     $ 14,624   $ 25,648 $ 26,881 $ 16,724 $ 15,584            
Sale of stock, maximum consideration on transaction $ 200,000                          
Agreement term (in years) 3 years                          
Sale of stock, number of shares issued in transaction (in shares) | shares     201,212     335,449     535,760 791,097        
Sale of stock, consideration received on transaction           $ 27,000     $ 40,500 $ 60,000        
Payments for commissions     $ 200     400     600 900        
Payments of stock issuance costs     100     100     300 800        
Sale of Stock, remaining available for sale     68,000           $ 68,000          
Debt instrument term (in years)                 5 years          
Incremental expansion of borrowing capacity     30,000           $ 30,000          
Notes payable to banks     119,000           119,000         $ 165,000
Syndicated Revolving Credit Facility                            
Summary of significant accounting policies                            
Notes payable to banks     119,000           119,000          
GSWC                            
Summary of significant accounting policies                            
Property installed by developers and conveyed                 $ 17,514 4,971        
Issuance of Common Shares from an at-the-market program, net of issuance costs (in shares) | shares   3.6500             3.6500          
Issuance of Common Shares from an at-the-market offering program, net of issuance costs   $ 50,000   $ 50,005         $ 50,000          
Sale of stock, consideration received on transaction     14,700                      
Incremental expansion of borrowing capacity     75,000           75,000          
GSWC | Financing Application                            
Summary of significant accounting policies                            
Regulatory rate case filings requested authorization for debt and equity issuance                       $ 750,000    
GSWC | Syndicated Revolving Credit Facility                            
Summary of significant accounting policies                            
Notes payable to banks     0           0          
GSWC | Unsecured private-placement notes                            
Summary of significant accounting policies                            
Face amount of debt     100,000           $ 100,000   $ 100,000      
GSWC | Series A Senior Notes at a coupon rate of 5.65% due May 29, 2037                            
Summary of significant accounting policies                            
Face amount of debt                     $ 75,000      
Stated interest rate percentage                     5.30%      
GSWC | Series B Senior Notes at a coupon rate of 5.65% due May 29, 2037                            
Summary of significant accounting policies                            
Face amount of debt                     $ 25,000      
Stated interest rate percentage                     5.65%      
GSWC | Water:                            
Summary of significant accounting policies                            
Number of customers | customer                 265,000          
GSWC | Water: | San Juan Oak                            
Summary of significant accounting policies                            
Service connections | customer                 1,300          
Property installed by developers and conveyed       $ 10,700                    
BVES                            
Summary of significant accounting policies                            
Payments to affiliate for corporate office administrative and general costs     800     700     $ 2,700 2,400        
Face amount of debt                         $ 50,000  
Maximum borrowing capacity on line of credit     65,000           65,000          
BVES | Syndicated Revolving Credit Facility                            
Summary of significant accounting policies                            
Notes payable to banks     5,000           5,000          
BVES | Unsecured private-placement notes                            
Summary of significant accounting policies                            
Face amount of debt     50,000           $ 50,000          
BVES | Electric:                            
Summary of significant accounting policies                            
Number of customers | customer                 25,000          
ASUS                            
Summary of significant accounting policies                            
Payments to affiliate for corporate office administrative and general costs     $ 1,200     $ 1,200     $ 4,000 $ 4,000        
Bay State Utility Service LLC (" BSUS")                            
Summary of significant accounting policies                            
Number of contracts with 15 year contract | contract     1           1          
Bay State Utility Service LLC (" BSUS") | Contracted services:                            
Summary of significant accounting policies                            
Period of fixed price contracts to operate and maintain water systems at various military bases                 15 years          
Maximum | Syndicated Revolving Credit Facility                            
Summary of significant accounting policies                            
Current borrowing capacity     $ 195,000           $ 195,000          
Maximum | GSWC | Syndicated Revolving Credit Facility                            
Summary of significant accounting policies                            
Current borrowing capacity     200,000           $ 200,000          
Maximum | ASUS                            
Summary of significant accounting policies                            
Period of fixed price contracts to operate and maintain water systems at various military bases                 50 years          
Minimum | Syndicated Revolving Credit Facility                            
Summary of significant accounting policies                            
Current borrowing capacity     $ 165,000           $ 165,000