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Contingencies: (Details) (GSWC, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Environmental Clean-Up and Remediation
  
Contingencies  
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 $ 1.0
City of Claremont | Condemnation of Properties
  
Contingencies  
Number of customers served through water systems 11,000
Ojai FLOW | Condemnation of Properties
  
Contingencies  
Number of customers served through water systems 3,000