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Contingencies and Gain on Sale of Assets (Details)		9 Months Ended
	Jun. 08, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Proceeds from sale of assets		$ 63,000	$ 34,324,000
Amount spent in clean-up and remediation activities		1,500,000
Golden State Water Company
Loss Contingencies [Line Items]
Proceeds from sale of assets		0	34,324,000
Environmental remediation expense		5,400,000
Environmental Clean-Up and Remediation | Golden State Water Company
Loss Contingencies [Line Items]
Accrued liability for the estimated additional cost to complete the clean-up at the site		$ 1,300,000
Ojai Water System
Loss Contingencies [Line Items]
Loss contingency number of customers served	2,900
Ojai Water System | Golden State Water Company
Loss Contingencies [Line Items]
Proceeds from sale of assets	$ 34,300,000
Gain (loss) on sale of properties			$ 8,300,000

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Represents the number of customers served by the entity.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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Amount of the estimated recovery from third parties recorded in the period for an individual site that reduces environmental remediation expense.

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