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Bank Borrowings and Long-Term Liabilities - Narrative (Details)		9 Months Ended
	Apr. 23, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Aug. 02, 2022 USD ($)	Aug. 01, 2022 USD ($)	Jul. 14, 2022 USD ($)	Jun. 28, 2022 USD ($)	Apr. 06, 2022 USD ($)
Debt Instrument [Line Items]
Repayments of lines of credit		$ 16,481,000	$ 120,120,000
4.54% Note Due May 2042 | Notes Payable to Banks | Maine Water Company
Debt Instrument [Line Items]
Aggregate principal amount								$ 15,000,000
Interest rate								4.54%
4.71% Senior Note, Series 2022, Due 2052 | Senior Notes | Connecticut Water Company
Debt Instrument [Line Items]
Aggregate principal amount							$ 25,000,000
Interest rate							4.71%
4.85% Senior Note, Series P | Senior Notes | San Jose Water Company
Debt Instrument [Line Items]
Aggregate principal amount						$ 70,000,000
Interest rate						4.85%
Revolving Credit Facility | Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 300,000,000
Capitalization ratio				0.70
Revolving Credit Facility | Credit Agreement | Line of Credit | CTWS
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 90,000,000
Revolving Credit Facility | SJWC Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Repayments of lines of credit	$ 140,000,000
Revolving Credit Facility | SJWTX Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000,000
Revolving Credit Facility | Amended and Restated Revolving Credit Facility | Line of Credit | CTWS
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 10,000,000	$ 75,000,000

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