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Contingencies and Gain on Sale of Assets Loss Contingencies Number of Customer Served (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 08, 2017 connection | Oct. 31, 2017 USD ($) customer | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($)
GOLDEN STATE WATER COMPANY | City of Claremont |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation Settlement, Expense |  |  |  | $ 5,900,000
Ojai Water System |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency number of customers served | connection | 2,900 |  |  |
Subsequent Event |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation Settlement, Expense |  | $ 895,000 |  |
Subsequent Event | Condemnation of Properties | GOLDEN STATE WATER COMPANY | City of Claremont |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency number of customers served | customer |  | 11,000 |  |
Scenario, Forecast | Subsequent Event | City of Claremont |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation Settlement, Expense |  |  | $ 2,000,000 |

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