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Long-Term Liabilities and Bank Borrowings (Details) - USD ($)	Aug. 11, 2020	May 11, 2020	Mar. 12, 2020	Mar. 11, 2020	Feb. 03, 2020	Sep. 30, 2020	May 29, 2020	May 28, 2020	May 10, 2020	Apr. 29, 2020	Apr. 28, 2020	Dec. 31, 2019	Dec. 19, 2019
Debt Instrument [Line Items]
Long-term Debt						$ 1,379,555,000						$ 1,305,869,000
Connecticut Water Company [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal Debt Sold			$ 35,000,000
Debt Instrument, Interest Rate, Stated Percentage			3.51%
Ratio of Indebtedness to Capital			0.60
Maine Water Company [Member]
Debt Instrument [Line Items]
Increase (Decrease) in Restricted Cash				$ (886,000)	$ (4,114,000)
Maine Water Company [Member] | Public Utility, Bonds [Member]
Debt Instrument [Line Items]
Ratio of Indebtedness to Capital													0.65
Maine Water Company [Member] | Public Utility, Bonds [Member] | State Revolving Fund Loans Series S [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage													1.00%
Long-term Debt													$ 5,000,000
Parent [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal Debt Sold	$ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage	2.47%
Revolving Credit Facility [Member] | Chase Bank, N.A. [Member] | SJW Corp. and SJW Land Company [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity										$ 0	$ 15,000,000
Revolving Credit Facility [Member] | Chase Bank, N.A. [Member] | San Jose Water Company [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 140,000,000							$ 125,000,000
Line of Credit Facility, Increase in Maximum Borrowing Capacity		15,000,000
Revolving Credit Facility - Temporary [Member] | Chase Bank, N.A. [Member] | San Jose Water Company [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 50,000,000
Connecticut Water Service, Inc. [Member] | Revolving Credit Facility [Member] | CoBank [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							$ 40,000,000	$ 15,000,000
Line of Credit Facility, Increase in Maximum Borrowing Capacity							$ 25,000,000
Fed Funds Effective Rate | Revolving Credit Facility - Temporary [Member] | Chase Bank, N.A. [Member] | San Jose Water Company [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.50%
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility - Temporary [Member] | Chase Bank, N.A. [Member] | San Jose Water Company [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.00%

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