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Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Oct. 31, 2022	Jul. 14, 2022	Jun. 28, 2022	Apr. 06, 2022	Dec. 31, 2021
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%
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%
Significant Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value of long-term debt	$ 1,294,354					$ 1,651,825

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