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Contingencies and Assets Held for Sale (Details) customer in Thousands, $ in Thousands		3 Months Ended
	Apr. 12, 2017 USD ($)	Mar. 31, 2017 USD ($) customer	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Contingencies
Advances for construction		$ (68,634)		$ (69,722)
Contributions in aid of construction - net		(120,173)		(120,518)
Disposal Group, Including Discontinued Operation, Deferred Tax Asset, Current		938		0
Ojai water system
Contingencies
Property, Plant and Equipment, Net		22,435
Accounts Receivable, Gross, Current		399
Net Regulatory Assets		4,004
Assets Held-for-sale, Not Part of Disposal Group, Current		26,838
Advances for construction		(383)
Contributions in aid of construction - net		(555)
Disposal Group, Including Discontinued Operation, Deferred Tax Asset, Current		938
GSWC
Contingencies
Net Regulatory Assets		155,987		146,281
Advances for construction		(68,634)		(69,722)
Contributions in aid of construction - net		(120,173)		(120,518)
Disposal Group, Including Discontinued Operation, Deferred Tax Asset, Current		938		$ 0
GSWC | Environmental Clean-Up and Remediation
Contingencies
Amount spent in clean-up and remediation activities		5,200
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities		1,500
Accrued liability for the estimated additional cost to complete the clean-up at the site		$ 1,400
City of Claremont | GSWC | Condemnation of Properties
Contingencies
Number of customers served through water systems | customer		11
Eminent domain action and other litigation | GSWC | Ojai water system | Scenario, Forecast [Member]
Contingencies
Gain (Loss) on Sale of Assets and Asset Impairment Charges			$ 8,000
Eminent domain action and other litigation | GSWC | Ojai water system | Subsequent event
Contingencies
Net Assets	$ 34,500

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