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Summary of Significant Accounting Policies (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
customer
registrant
item
state
shares
Mar. 31, 2024
USD ($)
shares
May 06, 2025
USD ($)
Mar. 13, 2025
USD ($)
Feb. 12, 2025
USD ($)
Dec. 31, 2024
USD ($)
Feb. 27, 2024
USD ($)
Summary of significant accounting policies              
Number of customers | customer 1,000,000            
Number of states in which entity operates | state 10            
Number of registrants filing combined report | registrant 2            
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 334,548 227,981          
Sale of stock, consideration received on transaction $ 25,800 $ 16,200          
Payments for commissions 400 200          
Payments of stock issuance costs 100 600          
Sale of Stock, remaining available for sale $ 82,900            
Debt instrument term (in years) 5 years            
Incremental expansion of borrowing capacity $ 60,000            
Notes payable to banks 106,000         $ 165,000  
Notes payable to banks 143,000         124,000  
Syndicated Revolving Credit Facility              
Summary of significant accounting policies              
Notes payable to banks 106,000            
GSWC              
Summary of significant accounting policies              
Incremental expansion of borrowing capacity $ 75,000            
Intercompany borrowings payment term 24 months            
Notes payable to banks $ 143,000         $ 124,000  
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 $ 143,000            
GSWC | Water:              
Summary of significant accounting policies              
Number of customers | customer 264,800            
BVES              
Summary of significant accounting policies              
Payments to affiliate for corporate office administrative and general costs $ 1,000 900          
Intercompany borrowings payment term 24 months            
Maximum borrowing capacity on line of credit $ 65,000            
Face amount of debt         $ 50,000    
BVES | Electric:              
Summary of significant accounting policies              
Number of customers | customer 24,900            
ASUS              
Summary of significant accounting policies              
Payments to affiliate for corporate office administrative and general costs $ 1,600 $ 1,600          
Bay State Utility Service LLC (" BSUS")              
Summary of significant accounting policies              
Number of contracts with 15 year contract | item 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 $ 165,000            
Maximum | Syndicated Revolving Credit Facility | Subsequent Event              
Summary of significant accounting policies              
Current borrowing capacity     $ 195,000        
Maximum | GSWC | Syndicated Revolving Credit Facility              
Summary of significant accounting policies              
Current borrowing capacity $ 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