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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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