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Contingencies (Details) - GSWC
customer in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
customer
Nov. 04, 2014
USD ($)
Environmental Clean-Up and Remediation    
Contingencies    
Amount spent in clean-up and remediation activities $ 4,900  
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 | Condemnation of Properties    
Contingencies    
Amount of Water Revenue Bonds Authorized to Finance Acquisition of the System   $ 135,000
Number of customers served through water systems | customer 11  
Ojai FLOW | Condemnation of Properties    
Contingencies    
Number of customers served through water systems | customer 3  
Transmission and distribution | City of Claremont | Condemnation of Properties    
Contingencies    
Public Utilities, Property, Plant and Equipment, Net $ 49,300