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Dividend Limitations (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dividend limitations        
Common shareholder’s equity $ 558,223,000 $ 529,945,000 $ 494,297,000 $ 465,945,000
Reinvested earnings in the business 304,534,000 279,821,000    
AWR        
Dividend limitations        
Common shareholder’s equity 558,223,000 529,945,000    
Subsidiaries [Member]        
Dividend limitations        
Dividends paid 79,000,000 36,500,000 33,800,000  
GSWC        
Dividend limitations        
Fixed amount in computing maximum ability to pay dividends $ 21,000,000.0      
Percentage of consolidated net income plus the aggregate net cash proceeds received from capital stock offerings or other instruments convertible into capital stock 100.00%      
Amount available to pay dividends under the most restrictive of the Note Agreements $ 427,400,000      
Dividends paid 68,850,000 27,680,000 25,450,000  
Common shareholder’s equity $ 503,575,000 474,374,000 446,770,000 423,730,000
Ratio of Indebtedness to Net Capital 0.4298      
Reinvested earnings in the business $ 211,163,000 232,193,000    
GSWC | Maximum        
Dividend limitations        
Ratio of Indebtedness to Net Capital 0.6667      
Earnings Reinvested in the Business        
Dividend limitations        
Common shareholder’s equity $ 304,534,000 279,821,000 247,065,000 220,923,000
Earnings Reinvested in the Business | GSWC        
Dividend limitations        
Common shareholder’s equity 211,163,000 $ 232,193,000 $ 206,288,000 $ 184,935,000
Earnings Reinvested in the Business | American States Utility Services [Member]        
Dividend limitations        
Reinvested earnings in the business $ 67,300,000