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Contingencies (Details) - GSWC $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) customer
Environmental Clean-Up and Remediation
Contingencies
Amount spent in clean-up and remediation activities	$ 5.2
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities	1.5
Accrued liability for the estimated additional cost to complete the clean-up at the site	1.4
Ojai FLOW | Condemnation of Properties
Contingencies
Net book value, water system	$ 22.5
Number of customers served through water systems | customer	3,000

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- Definition

Represents the amount of environmental remediation costs paid by the third party.

+ References

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- Definition

Represents the number of customers served by the entity.

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- Definition

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
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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- Definition

The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

+ References

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-Name Accounting Standards Codification
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-SubTopic 30
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Period end amount of total net PPE.

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