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Long-Term Debt Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Unamortized Debt Issuance Expense | $ 4,257,000 |  | $ 3,638,000 |
Long-term debt | 437,717,000 |  | 384,316,000 |
Restricted Cash and Cash Equivalents | 19,001,000 |  | 0 | $ 0
Significant Observable Inputs (Level 2) |  |  |  |
Fair value of long-term debt | 502,446,000 |  | 500,035,000 |
Senior Notes [Member] |  |  |  |
Long-term debt | 315,000,000 |  | 315,000,000 |
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds Two [Member] |  |  |  |
Long-term debt | $ 70,000,000 |  | 0 |
Stated interest rates | 4.75% |  |  |
Restricted Cash and Cash Equivalents | $ 19,001,000 |  |  |
San Jose Water Company [Member] | Senior Notes [Member] |  |  |  |
Ratio of indebtedness to total capital | 0.6666 |  |  |
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges | 1.75 |  |  |
San Jose Water Company [Member] | Senior Notes [Member] | Series A [Member] |  |  |  |
Long-term debt | $ 20,000,000 |  | 20,000,000 |
Stated interest rates | 8.58% |  |  |
San Jose Water Company [Member] | Senior Notes [Member] | Series L [Member] |  |  |  |
Long-term debt | $ 50,000,000 |  | 50,000,000 |
Stated interest rates | 5.14% |  |  |
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Senior Notes [Member] | Series A [Member] |  |  |  |
Long-term debt | $ 15,000,000 |  | 15,000,000 |
Stated interest rates | 6.27% |  |  |
Ratio of indebtedness to total capital | 0.6666 |  |  |
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges | 1.75 |  |  |
SJW Group [Member] | Senior Notes [Member] | Series A [Member] |  |  |  |
Long-term debt | $ 50,000,000 |  | 50,000,000 |
Stated interest rates | 4.35% |  |  |
Ratio of indebtedness to total capital | 0.6666 |  |  |
Minimum net worth required for compliance | $ 175,000,000 |  |  |
Cumulative net income, percentage included in net worth for compliance | 30.00% |  |  |
SJW Group [Member] | Senior Notes [Member] | Series A [Member] | Financial Guarantee [Member] |  |  |  |
Ratio of indebtedness to total capital | 0.6666 |  |  |
Minimum net worth required for compliance | $ 125,000,000 |  |  |
SJW Group [Member] | Senior Notes [Member] | Series A [Member] | Financial Guarantee [Member] | Minimum [Member] |  |  |  |
Cumulative net income, percentage included in net worth for compliance | 30.00% |  |  |
Other Assets [Member] | Accounting Standards Update 2015-03 [Member] |  |  |  |
Unamortized Debt Issuance Expense |  | $ 3,561,000 | 3,638,000 |
Long-term Debt [Member] | Accounting Standards Update 2015-03 [Member] |  |  |  |
Unamortized Debt Issuance Expense |  | $ (3,561,000) | $ (3,638,000) |
Standby Letters of Credit [Member] | San Jose Water Company [Member] | Line of Credit [Member] |  |  |  |
Standby letters of credit | $ 3,000,000 |  |  |

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