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Long-Term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Total debt | $ 1,583,441 | $ 1,488,788
Unamortized debt premium and discount, net | 1,583 | 17,396
Unamortized debt issuance costs | (9,350) | (9,859)
Current portion | (48,975) | (4,360)
Total long-term debt, less current portion | 1,526,699 | 1,491,965
SJW Group |  |
Debt Instrument [Line Items] |  |
Total long-term debt, less current portion | 557,028 | 556,627
SJW Group | Senior notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 560,000 | 560,000
SJW Group | Senior notes | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 2.47% |
SJW Group | Senior notes | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 3.53% |
SJWC | California Pollution Control Financing Authority Revenue Bond |  |
Debt Instrument [Line Items] |  |
Total debt | $ 540,000 | 470,000
SJWC | Senior notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 470,000 | 400,000
SJWC | Senior notes | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 3.00% |
SJWC | Senior notes | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 7.37% |
SJWC | Public utility, bonds | California Pollution Control Financing Authority Revenue Bond |  |
Debt Instrument [Line Items] |  |
Total debt | $ 70,000 | 70,000
SJWC | Public utility, bonds | California Pollution Control Financing Authority Revenue Bond | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 4.75% |
SJWC | Public utility, bonds | California Pollution Control Financing Authority Revenue Bond | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 4.75% |
CTWS | Bank term loans |  |
Debt Instrument [Line Items] |  |
Total debt | $ 16,457 | 18,444
CTWS | Bank term loans | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 4.09% |
CTWS | Bank term loans | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 4.15% |
Connecticut Water Company |  |
Debt Instrument [Line Items] |  |
Total debt | $ 313,345 | 313,345
Connecticut Water Company | Senior notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 195,000 | 195,000
Connecticut Water Company | Senior notes | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 3.07% |
Connecticut Water Company | Senior notes | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 4.71% |
Connecticut Water Company | Public utility, bonds | Connecticut Innovations Revenue Bonds, variable rate |  |
Debt Instrument [Line Items] |  |
Total debt | $ 22,050 | 22,050
Connecticut Water Company | Bank term loans |  |
Debt Instrument [Line Items] |  |
Total debt | $ 96,295 | 96,295
Connecticut Water Company | Bank term loans | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 4.04% |
Connecticut Water Company | Bank term loans | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 4.75% |
SJWTX |  |
Debt Instrument [Line Items] |  |
Total debt | $ 60,000 | 60,000
SJWTX | Senior notes |  |
Debt Instrument [Line Items] |  |
Total debt | $ 15,000 | 15,000
SJWTX | Senior notes | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 6.27% |
SJWTX | Senior notes | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 6.27% |
SJWTX | Bank term loans |  |
Debt Instrument [Line Items] |  |
Total debt | $ 45,000 | 45,000
SJWTX | Bank term loans | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 4.01% |
SJWTX | Bank term loans | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 5.54% |
TWR | TWR seller financing debt |  |
Debt Instrument [Line Items] |  |
Total debt | $ 29,000 | 0
TWR | TWR seller financing debt | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 5.61% |
TWR | TWR seller financing debt | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 5.61% |
Maine Water Company |  |
Debt Instrument [Line Items] |  |
Total debt | $ 64,639 | 66,999
Maine Water Company | Public utility, bonds | Other First Mortgage Bond |  |
Debt Instrument [Line Items] |  |
Total debt | $ 900 | 1,800
Maine Water Company | Public utility, bonds | Other First Mortgage Bond | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 8.95% |
Maine Water Company | Public utility, bonds | Other First Mortgage Bond | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 8.95% |
Maine Water Company | Bank term loans |  |
Debt Instrument [Line Items] |  |
Total debt | $ 49,500 | 49,500
Maine Water Company | Bank term loans | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 3.89% |
Maine Water Company | Bank term loans | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 5.51% |
Maine Water Company | Revolving Fund Loan | State revolving fund loans |  |
Debt Instrument [Line Items] |  |
Total debt | $ 14,239 | $ 15,699
Maine Water Company | Revolving Fund Loan | State revolving fund loans | Minimum |  |
Debt Instrument [Line Items] |  |
Rate | 0.00% |
Maine Water Company | Revolving Fund Loan | State revolving fund loans | Maximum |  |
Debt Instrument [Line Items] |  |
Rate | 2.23% |

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