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Contingencies: (Details) (GSWC, USD $)
In Millions, unless otherwise specified
 6 Months Ended 1 Months Ended
Jun. 30, 2014
Environmental Clean-Up and Remediation
Jun. 30, 2014
Ojai FLOW
Condemnation of Properties
customer
Jul. 31, 2014
Subsequent Event
City of Claremont
Condemnation of Properties
customer
Contingencies      
Condemnation     $ 135.0
Number of customers served through water systems   3,000 11,000
Amount spent in clean-up and remediation activities 4.1    
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