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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 ($)
Dec. 31, 2017
USD ($)
customer
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Contingencies            
Net utility plant   $ 1,204,992   $ 1,204,992 $ 1,150,926 $ 1,060,794
Gain (Loss) on Sale of Properties $ 8,300          
Proceeds from Sale of Other Assets 34,300          
Total Assets   1,416,734   1,416,734 1,470,493  
Other Credits   (67,465)   (67,465) (69,722)  
Advances for construction   (123,602)   (123,602) (120,518)  
GSWC            
Contingencies            
Net utility plant   1,197,940   1,197,940 1,145,311  
Gain (Loss) on Sale of Properties     $ 8,300      
Total Assets   1,326,823   1,326,823 1,384,178  
Other Credits   (67,465)   (67,465) (69,722)  
Advances for construction   (123,602)   (123,602) (120,518)  
Environmental Clean-Up and Remediation | GSWC            
Contingencies            
Amount spent in clean-up and remediation activities       5,300    
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities   1,500   1,500    
Accrued liability for the estimated additional cost to complete the clean-up at the site   1,300   $ 1,300    
City of Claremont [Member]            
Contingencies            
Litigation Settlement, Expense   2,000        
Legal Fees   1,800        
Litigation Settlement Interest   $ 200        
Registration Payment Arrangement, Period       12 years    
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            
Net utility plant $ 22,256          
Number of customers served through water systems | connection 2,900          
Accounts and Notes Receivable, Net $ 721          
Regulatory Assets 3,944          
Total Assets 26,921          
Other Credits (366)          
Advances for construction (532)          
Liabilities $ (898)