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Contingencies: (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	6 Months Ended
	Mar. 08, 2013 Barstow Perchlorate Contamination production_wells lawsuits	Jun. 30, 2013 Environmental Clean-Up and Remediation GSWC	Jun. 30, 2013 City of Claremont Condemnation of Properties GSWC customer	Jun. 30, 2013 Ojai FLOW Condemnation of Properties GSWC customer	Jun. 30, 2013 Santa Maria Valley Water Conservation District GSWC acrefeet
Contingencies
Number of toxic tort lawsuit served	4
Number of active production wells for which lawsuits served	1
Number of customers served through water systems			11,000	3,000
Area of groundwater replenishment provided (in acre-feet)					10,000
Percentage of the return flows generated from importation of state water project to be recaptured					45.00%
Amount spent in clean-up and remediation activities		$ 3.5
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		$ 1.2

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

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