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Long-Term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Aug. 11, 2020 | Mar. 12, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 1,352,320 |  |  | $ 1,292,586
Unamortized debt premium, net | 22,479 |  |  | 25,020
Unamortized debt issuance costs | 10,978 |  |  | 11,737
Current portion | 76,241 |  |  | 22,272
Total long-term debt, less current portion | 1,287,580 |  |  | 1,283,597
SJW Group |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current portion | 49,929 |  |  | 0
Total long-term debt, less current portion | 555,824 |  |  | 555,820
SJW Group | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 610,000 |  |  | 560,000
Stated interest rates |  | 2.47% |  |
SJW Group | Senior notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 2.47% |  |  |
SJW Group | Senior notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 4.35% |  |  |
San Jose Water Company | California Pollution Control Financing Authority Revenue Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 440,000 |  |  | 450,000
San Jose Water Company | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 320,000 |  |  | 330,000
San Jose Water Company | Senior notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 4.29% |  |  |
San Jose Water Company | Senior notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 8.58% |  |  |
San Jose Water Company | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 120,000 |  |  | 120,000
San Jose Water Company | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 4.75% |  |  |
San Jose Water Company | Public utility, bonds | California Pollution Control Financing Authority Revenue Bonds | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 5.10% |  |  |
Connecticut Water Service, Inc. | Bank term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 22,169 |  |  | 23,935
Connecticut Water Service, Inc. | Bank term loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 4.09% |  |  |
Connecticut Water Service, Inc. | Bank term loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 4.15% |  |  |
Connecticut Water Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 225,400 |  |  | 198,646
Connecticut Water Company | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 70,000 |  |  | 35,000
Stated interest rates |  |  | 3.51% |
Connecticut Water Company | Senior notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 3.51% |  |  |
Connecticut Water Company | Senior notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 3.53% |  |  |
Connecticut Water Company | Public utility, bonds | Connecticut Innovations Revenue Bonds, variable rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 22,050 |  |  | 22,050
Connecticut Water Company | Public utility, bonds | Connecticut Innovations Revenue Bonds, fixed rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 22,260 |  |  | 22,506
Stated interest rates | 5.00% |  |  |
Connecticut Water Company | Bank term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 111,090 |  |  | 119,090
Connecticut Water Company | Bank term loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 3.51% |  |  |
Connecticut Water Company | Bank term loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 4.75% |  |  |
SJWTX, Inc. | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 15,000 |  |  | 15,000
Stated interest rates | 6.27% |  |  |
Maine Water Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 39,751 |  |  | 38,032
Maine Water Company | Public utility, bonds | State revolving fund loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 18,651 |  |  | 16,032
Maine Water Company | Public utility, bonds | State revolving fund loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 0.00% |  |  |
Maine Water Company | Public utility, bonds | State revolving fund loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 2.58% |  |  |
Maine Water Company | Public utility, bonds | Other First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 3,600 |  |  | 4,500
Stated interest rates | 8.95% |  |  |
Maine Water Company | Bank term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 17,500 |  |  | 17,500
Maine Water Company | Bank term loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 4.18% |  |  |
Maine Water Company | Bank term loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rates | 5.51% |  |  |
Heritage Valley Water Company | Bank term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 0 |  |  | 4,164
Stated interest rates | 4.75% |  |  |
Avon Water Company | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 0 |  |  | $ 2,809
Stated interest rates | 3.05% |  |  |

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