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Contingencies (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 08, 2017
USD ($)
connection
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
customer
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Contingencies            
Net utility plant   $ 1,204,992   $ 1,296,310 $ 1,204,992 $ 1,150,926
Gain on sale of assets $ 8,300          
Proceeds from Sale of Other Assets $ 34,300          
GSWC            
Contingencies            
Net utility plant   1,197,940   1,281,092 1,197,940  
Gain on sale of assets     $ 8,300      
Environmental Clean-Up and Remediation | GSWC            
Contingencies            
Amount spent in clean-up and remediation activities       5,900    
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       $ 1,300    
City of Claremont [Member]            
Contingencies            
Litigation Settlement, Expense   2,000        
Legal Fees   1,800        
Litigation Settlement Interest   $ 200        
City of Claremont [Member] | GSWC            
Contingencies            
Litigation Settlement, Expense         $ 5,900  
Number of customers served through water systems | customer       11,000    
Maximum | City of Claremont [Member]            
Contingencies            
Litigation Settlement, Expense           $ 7,600
Ojai Water System [Member]            
Contingencies            
Number of customers served through water systems | connection 2,900