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Summary of Significant Accounting Policies (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2024 USD ($) | Jul. 01, 2024 USD ($) | Apr. 15, 2024 USD ($) | Sep. 30, 2024 USD ($) item state shares | Sep. 30, 2024 USD ($) item state shares | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) shares | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) customer registrant item state shares | Sep. 30, 2023 USD ($) shares | Jun. 05, 2024 USD ($) | Feb. 27, 2024 USD ($) | Dec. 31, 2023 USD ($)
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |
Number of states in which entity operates | state |  |  |  | 10 | 10 |  |  |  |  | 10 |  |  |  |
Number of military bases started operating in April 2024 | item |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
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 |  |  |  |  | 335,449 |  |  |  |  | 791,097 |  |  |  |
Sale of stock, consideration received on transaction |  |  |  |  | $ 27,000 |  |  |  |  | $ 60,000 |  |  |  |
Payments for commissions |  |  |  |  | 400 |  |  |  |  | 900 |  |  |  |
Payments of stock issuance costs |  |  |  |  | 100 |  |  |  |  | 800 |  |  |  |
Sale of Stock, remaining available for sale |  |  |  | $ 139,100 | 139,100 |  |  |  |  | $ 139,100 |  |  |  |
Debt instrument term (in years) |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Notes payable to banks |  |  |  | 120,000 | 120,000 |  |  |  |  | $ 120,000 |  |  |  | $ 291,500
Issuance of Common Shares from an at-the-market program, net of issuance costs |  |  |  |  | 26,881 | $ 16,724 | $ 15,584 |  |  |  |  |  |  |
Notes payable to banks |  |  |  | 177,000 | 177,000 |  |  |  |  | 177,000 |  |  |  | 42,000
Syndicated Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to banks |  |  |  | 120,000 | 120,000 |  |  |  |  | 120,000 |  |  |  |
GSWC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to banks |  |  |  | 0 | 0 |  |  |  |  | $ 0 |  |  |  | 150,000
Intercompany borrowings payment term |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |
Issuance of Common Shares from an at-the-market program, net of issuance costs (in shares) | shares |  |  |  |  |  |  |  | 1 |  |  | 1 |  |  |
Issuance of Common Shares from an at-the-market program, net of issuance costs |  |  |  |  |  |  |  | $ 10,000 | $ 10,000 |  | $ 10,000 |  |  |
Notes payable to banks |  |  |  | 140,000 | 140,000 |  |  |  |  | $ 140,000 |  |  |  | $ 0
GSWC | Unsecured Private Placement Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  | $ 65,000 |  |
Stated interest rate percentage |  |  |  |  |  |  |  |  |  |  |  | 5.50% |  |
GSWC | Syndicated Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to banks |  |  |  | 140,000 | 140,000 |  |  |  |  | $ 140,000 |  |  |  |
GSWC | Water: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  | 264,600 |  |  |  |
BVES |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to affiliate for corporate office administrative and general costs |  |  |  |  | 700 |  |  | 700 |  | $ 2,400 | 2,800 |  |  |
Intercompany borrowings payment term |  |  |  |  |  |  |  |  |  | 24 months |  |  |  |
Maximum borrowing capacity on line of credit |  |  |  | $ 65,000 | 65,000 |  |  |  |  | $ 65,000 |  |  |  |
Issuance of Common Shares from an at-the-market program, net of issuance costs (in shares) | shares |  |  |  | 11 |  |  |  |  |  |  |  |  |  |
Issuance of Common Shares from an at-the-market program, net of issuance costs |  |  |  | $ 22,000 |  |  |  |  |  |  |  |  |  |
BVES | Financing Application |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested deferment period | 9 months |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory rate case filings requested authorization for debt and equity issuance | $ 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |
BVES | Syndicated Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to banks |  |  |  | $ 37,000 | 37,000 |  |  |  |  | $ 37,000 |  |  |  |
BVES | Electric: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  | 24,800 |  |  |  |
ASUS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to affiliate for corporate office administrative and general costs |  |  |  |  | $ 1,200 |  |  | $ 1,100 |  | $ 4,000 | $ 3,800 |  |  |
Bay State Utility Service LLC (" BSUS") |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contracts with 15 year contract | item |  |  |  | 1 | 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 |  |  |  |
Initial price contract value |  |  |  |  | $ 75,000 |  |  |  |  |  |  |  |  |
JBCC approved task order value for the first year |  |  | $ 4,100 |  |  |  |  |  |  |  |  |  |  |
Patuxent River Utility Services LLC ( PRUS) | Contracted services: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of fixed price contracts to operate and maintain water systems at various military bases |  |  |  |  |  |  |  |  |  | 50 years |  |  |  |
Initial price contract value |  |  |  |  |  |  |  |  |  | $ 349,000 |  |  |  |
Revised price contract value after an inventory adjustment |  | $ 378,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Syndicated Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  | $ 165,000 | 165,000 |  |  |  |  | 165,000 |  |  |  |
Maximum | GSWC | Syndicated Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current borrowing capacity |  |  |  | $ 200,000 | $ 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 |  |  |  |

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