Lines of Credit and Long-Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Jun. 11, 2025	Apr. 15, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Weighted-average interest rate on short-term	5.43%			6.08%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Unused portion of line of credit	$ 199,160
Line of Credit | Revolving Credit Facility | CTWS Credit Agreement Maturing August 2025
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 40,000
Line of Credit | Revolving Credit Facility | SJWC Credit Agreement Maturing June 2026
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 10,000