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Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 14, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Nov. 15, 2023	Oct. 31, 2022	Jul. 14, 2022	Jun. 28, 2022	Apr. 06, 2022
Debt Instrument [Line Items]
Fair value of long-term debt		$ 1,394,412	$ 1,294,354
Seller financing in asset acquisition, net of discount		15,400	$ 0	$ 0
Significant Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value of long-term debt		1,378,683
Significant Unobservable Inputs (Level 3)
Debt Instrument [Line Items]
Fair value of long-term debt		$ 15,729
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
Seller financing in asset acquisition, net of discount	$ 15,400
SJWC | Senior notes | 4.85% Senior Note, Series P
Debt Instrument [Line Items]
Aggregate principal amount							$ 70,000
Rate							4.85%
Connecticut Water | Senior notes | 4.71% Senior Note, Series 2022, Due 2052
Debt Instrument [Line Items]
Aggregate principal amount								$ 25,000
Rate								4.71%
Connecticut Water | Senior notes | 6.46% Senior Note, Series 2023 Due 2054
Debt Instrument [Line Items]
Aggregate principal amount					$ 25,000
Rate					6.46%
SJWTX | Senior notes | 5.54% Senior Notes, Due May 2052
Debt Instrument [Line Items]
Aggregate principal amount						$ 15,000
Rate						5.54%
Maine Water | Bank term loans | 4.54% Note Due May 2042
Debt Instrument [Line Items]
Aggregate principal amount									$ 15,000
Rate									4.54%

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