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Revenue from Contract with Customer - Disaggregation of Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation of Revenue [Line Items]        
Regulated Operating Revenue, Water $ 76,733 $ 80,734 $ 141,145 $ 147,138
Revenues 106,901   201,629  
Golden State Water Company [Member]        
Disaggregation of Revenue [Line Items]        
Regulated Operating Revenue, Water 76,733 $ 80,734 141,145 $ 147,138
Golden State Water Company [Member] | Water Service Utility Operations [Member]        
Disaggregation of Revenue [Line Items]        
Regulated Operating Revenue, Water (5,301)   (2,703)  
Revenues 76,733   141,145  
Golden State Water Company [Member] | Electric Service Utility Operations [Member]        
Disaggregation of Revenue [Line Items]        
Regulated Operating Revenue, Electric, Non-Nuclear 17   251  
Revenues 7,841   17,673  
American States Utility Services [Member] | Contracted Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 22,327   42,811  
American States Utility Services [Member] | Contracted Services [Member] | Water [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 14,233   27,233  
American States Utility Services [Member] | Contracted Services [Member] | Wastewater [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 8,094   15,578  
Billed Revenues [Member] | Golden State Water Company [Member] | Water Service Utility Operations [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 71,432   138,442  
Billed Revenues [Member] | Golden State Water Company [Member] | Water Service Utility Operations [Member] | Tariff-based Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 70,251   136,026  
Billed Revenues [Member] | Golden State Water Company [Member] | Water Service Utility Operations [Member] | Surcharges (Cost-recovery Activities) [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 728   1,521  
Billed Revenues [Member] | Golden State Water Company [Member] | Water Service Utility Operations [Member] | Other Products and Services [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 453   895  
Billed Revenues [Member] | Golden State Water Company [Member] | Electric Service Utility Operations [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 7,858   17,924  
Billed Revenues [Member] | Golden State Water Company [Member] | Electric Service Utility Operations [Member] | Tariff-based Revenues [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 7,795   17,814  
Billed Revenues [Member] | Golden State Water Company [Member] | Electric Service Utility Operations [Member] | Surcharges (Cost-recovery Activities) [Member]        
Disaggregation of Revenue [Line Items]        
Revenues $ 63   $ 110