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Contingencies: (Details) (GSWC, USD $)
In Millions, unless otherwise specified
 1 Months Ended 9 Months Ended
Jul. 31, 2014
Sep. 30, 2014
customer
Environmental Clean-Up and Remediation
    
Contingencies    
Amount spent in clean-up and remediation activities   $ 4.3
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
City of Claremont | Condemnation of Properties
    
Contingencies    
Condemnation $ 135.0  
Number of customers served through water systems   11,000
Ojai FLOW | Condemnation of Properties
    
Contingencies    
Number of customers served through water systems   3,000
City of Apple Valley [Member] | Condemnation of Properties
    
Contingencies    
Number of customers served through water systems   2,900
City of Artesia [Member] | Condemnation of Properties
    
Contingencies    
Number of customers served through water systems   3,300