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Lines of Credit - Schedule of Lines of Credit (Details) - Revolving Credit Facility - Line of Credit - USD ($) $ in Thousands	Dec. 31, 2025	Jun. 11, 2025	Dec. 31, 2024	Dec. 31, 2019	Oct. 09, 2019
Line of Credit Facility [Line Items]
Line Limit	$ 370,000
Amounts Outstanding	86,834		$ 119,124
Unused Portion	283,166
Syndicated Credit Agreement
Line of Credit Facility [Line Items]
Line Limit	350,000
Amounts Outstanding	85,000		77,000
Unused Portion	265,000
H2O America Credit Agreement Maturing September 2030
Line of Credit Facility [Line Items]
Line Limit	50,000
Amounts Outstanding	11,000		3,000
Unused Portion	39,000
SJWC Credit Agreement Maturing September 2030
Line of Credit Facility [Line Items]
Line Limit	165,000
Amounts Outstanding	45,000		44,000
Unused Portion	120,000
CTWS Syndicated Credit Agreement Maturing September 2030
Line of Credit Facility [Line Items]
Line Limit	0
Amounts Outstanding	0		30,000
Unused Portion	0
CWC Credit Agreement Maturing September 2030
Line of Credit Facility [Line Items]
Line Limit	80,000
Amounts Outstanding	13,000		0
Unused Portion	67,000
MWC Credit Agreement Maturing September 2030
Line of Credit Facility [Line Items]
Line Limit	25,000
Amounts Outstanding	0		0
Unused Portion	25,000
SJWTX Credit Agreement Maturing September 2030
Line of Credit Facility [Line Items]
Line Limit	30,000
Amounts Outstanding	16,000		0
Unused Portion	14,000
SJWC Credit Agreement Maturing June 2026
Line of Credit Facility [Line Items]
Line Limit	10,000	$ 10,000
Amounts Outstanding	0		0
Unused Portion	10,000
CTWS Credit Agreement Maturing August 2028
Line of Credit Facility [Line Items]
Line Limit	10,000			$ 10,000	$ 75,000
Amounts Outstanding	1,834		2,124
Unused Portion	8,166
CTWS Credit Agreement Maturing May 2025
Line of Credit Facility [Line Items]
Line Limit	0				$ 40,000
Amounts Outstanding	0		$ 40,000
Unused Portion	$ 0

X

- 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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X

- 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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X

- 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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X

- 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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