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Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended
	Aug. 14, 2023	Aug. 31, 2023	Dec. 31, 2024	Dec. 06, 2024	Jul. 31, 2024	Dec. 31, 2023	Nov. 15, 2023	Feb. 06, 2023	Jul. 14, 2022
Debt Instrument [Line Items]
Fair value of long-term debt			$ 1,490,024			$ 1,394,412
KT Water Resource L. P.
Debt Instrument [Line Items]
Asset acquisition, post-closing production payment	$ 29,000
Asset acquisition, period of post-closing production payment	29 years
SJWC | Senior notes | 4.85% Senior Note, Series P
Debt Instrument [Line Items]
Aggregate principal amount									$ 70,000
Rate									4.85%
SJWC | Senior notes | 5.63% Senior Note, Series Q
Debt Instrument [Line Items]
Aggregate principal amount					$ 75,000
Rate					5.63%
CWC | Senior notes | 6.46% Senior Notes, Series 2023
Debt Instrument [Line Items]
Aggregate principal amount							$ 25,000
Rate							6.46%
CWC | Senior notes | 5.78% Senior Note, Series 2024
Debt Instrument [Line Items]
Aggregate principal amount					$ 50,000
Rate					5.78%
TWR | KT Water Resource L. P.
Debt Instrument [Line Items]
Asset acquisition, post-closing production payment		$ 29,000
TWC | Bank term loans | 6.473% due on November 20, 2054
Debt Instrument [Line Items]
Rate				6.47%
Line Limit				$ 20,000
MWC | Bank term loans | 6.473% due on November 20, 2054
Debt Instrument [Line Items]
Rate				6.47%
Line Limit				$ 15,000
CTWS | Bank term loans
Debt Instrument [Line Items]
Rate								4.09%
Significant Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value of long-term debt			1,473,393			1,378,683
Significant Unobservable Inputs (Level 3)
Debt Instrument [Line Items]
Fair value of long-term debt			$ 16,631			$ 15,729

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