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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
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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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