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Long-Term Debt Long-term Debt Schedule (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 435,000 | $ 437,717
Unamortized Debt Issuance Expense | 3,908 | 4,257
Current portion | 0 | 125
Long-term debt, less current portion | 431,092 | 433,335
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 315,000 | 315,000
Mortgages [Member] | 444 West Santa Clara Street, L.P. [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 2,717
Stated interest rates | 5.68% |
San Jose Water Company [Member] | Senior Notes [Member] | Series A [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 20,000 | 20,000
Stated interest rates | 8.58% |
San Jose Water Company [Member] | Senior Notes [Member] | Series B [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 30,000 | 30,000
Stated interest rates | 7.37% |
San Jose Water Company [Member] | Senior Notes [Member] | Series C [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 10,000 | 10,000
Stated interest rates | 9.45% |
San Jose Water Company [Member] | Senior Notes [Member] | Series D [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 15,000 | 15,000
Stated interest rates | 7.15% |
San Jose Water Company [Member] | Senior Notes [Member] | Series E [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 15,000 | 15,000
Stated interest rates | 6.81% |
San Jose Water Company [Member] | Senior Notes [Member] | Series F [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 20,000 | 20,000
Stated interest rates | 7.20% |
San Jose Water Company [Member] | Senior Notes [Member] | Series G [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 20,000 | 20,000
Stated interest rates | 5.93% |
San Jose Water Company [Member] | Senior Notes [Member] | Series H [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 20,000 | 20,000
Stated interest rates | 5.71% |
San Jose Water Company [Member] | Senior Notes [Member] | Series I [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 20,000 | 20,000
Stated interest rates | 5.93% |
San Jose Water Company [Member] | Senior Notes [Member] | Series J [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 10,000 | 10,000
Stated interest rates | 6.54% |
San Jose Water Company [Member] | Senior Notes [Member] | Series K [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 20,000 | 20,000
Stated interest rates | 6.75% |
San Jose Water Company [Member] | Senior Notes [Member] | Series L [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000 | 50,000
Stated interest rates | 5.14% |
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000 | 50,000
Stated interest rates | 5.10% |
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds Two [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 70,000 | 70,000
Stated interest rates | 4.75% |
SJW Group [Member] | Senior Notes [Member] | Series A [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000 | 50,000
Stated interest rates | 4.35% |
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Senior Notes [Member] | Series A [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 15,000 | $ 15,000
Stated interest rates | 6.27% |

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