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Lines of Credit - Narrative (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Jul. 11, 2025 USD ($)	Aug. 31, 2022 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 12, 2025 USD ($)	Jun. 11, 2025 USD ($)	Aug. 02, 2023	Dec. 31, 2019 USD ($)	Oct. 09, 2019 USD ($)
Line of Credit Facility [Line Items]
Weighted-average interest rate on short-term borrowings			4.75%	6.08%
Repayments of lines of credit			$ 468,821	$ 295,260	$ 134,493
Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Aggregate outstanding balance on lines of credit			86,834	119,124
Unused Portion			283,166
Line Limit			370,000
Revolving Credit Facility | Line of Credit | Credit Agreement
Line of Credit Facility [Line Items]
Aggregate outstanding balance on lines of credit			85,000	77,000
Line Limit		$ 300,000				$ 350,000
Debt instrument term		5 years
Capitalization ratio								0.70
Revolving Credit Facility | Line of Credit | CTWS Credit Agreement Maturing May 2025
Line of Credit Facility [Line Items]
Aggregate outstanding balance on lines of credit			0	40,000
Unused Portion			0
Line Limit			0							$ 40,000
Repayments of lines of credit	$ 25,000
Revolving Credit Facility | Line of Credit | CTWS Credit Agreement Maturing August 2028
Line of Credit Facility [Line Items]
Aggregate outstanding balance on lines of credit			1,834	2,124
Unused Portion			8,166
Line Limit			10,000						$ 10,000	$ 75,000
Revolving Credit Facility | Line of Credit | SJWC Credit Agreement Maturing June 2026
Line of Credit Facility [Line Items]
Aggregate outstanding balance on lines of credit			0	$ 0
Unused Portion			10,000
Line Limit			$ 10,000				$ 10,000

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Debt Instrument, Covenant, Capitalization Ratio

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

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