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Contingencies and Gain on Sale of Assets Loss Contingencies Number of Customer Served (Details) |  | 6 Months Ended
--- | --- | ---
Jun. 08, 2017 USD ($) | Jun. 30, 2017 customer
Condemnation of Properties | GOLDEN STATE WATER COMPANY | City of Claremont |  |
Loss Contingencies [Line Items] |  |
Loss contingency number of customers served | customer |  | 11,000
Ojai Water System |  |
Loss Contingencies [Line Items] |  |
Loss contingency number of customers served | $ | 2,900 |

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