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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details 4) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 27, 2015
Short-term borrowing activities (excluding letters of credit)        
Balance outstanding at the end of the period $ 28,000,000 $ 0    
Syndicated revolving credit facility        
Note payable to banks        
Increase in additional aggregate bank commitments $ 50,000,000.0      
Variable rate basis Euro rate      
Syndicated revolving credit facility | Minimum        
Short-term borrowing activities (excluding letters of credit)        
Interest coverage ratio 325.00%      
Syndicated revolving credit facility | Maximum        
Short-term borrowing activities (excluding letters of credit)        
Total funded debt ratio 65.00%      
GSWC        
Short-term borrowing activities (excluding letters of credit)        
Dividends paid $ 62,000,000 52,000,000 $ 29,400,000  
AWR        
Note payable to banks        
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 1,500,000      
Maximum borrowing capacity 100,000,000.0      
Short-term borrowing activities (excluding letters of credit)        
Balance outstanding at the end of the period 28,000,000 $ 0    
Dividends paid     $ 29,400,000  
AWR | Syndicated revolving credit facility        
Note payable to banks        
Increase in additional aggregate bank commitments $ 50,000,000.0      
Short-term borrowing activities (excluding letters of credit)        
Interest coverage ratio 768.00%      
Total funded debt ratio 44.00%      
AWR | Syndicated revolving credit facility | Minimum        
Short-term borrowing activities (excluding letters of credit)        
Interest coverage ratio 325.00%      
AWR | Syndicated revolving credit facility | Maximum        
Short-term borrowing activities (excluding letters of credit)        
Total funded debt ratio 65.00%      
AWR | Syndicated revolving credit facility | Letters of credit        
Note payable to banks        
Maximum borrowing capacity $ 25,000,000      
Letter of credit, amount $ 10,400,000      
Letter of credit fee (as a percent) 0.65%      
Notes Payable, Other Payables [Member] | GSWC        
Short-term borrowing activities (excluding letters of credit)        
Debt Instrument, Face Amount       $ 40,000,000
Debt Instrument, Maximum Borrowing Capacity       40,000,000
Notes Payable, Other Payables [Member] | American States Utility Services [Member]        
Short-term borrowing activities (excluding letters of credit)        
Debt Instrument, Face Amount       10,000,000
Debt Instrument, Maximum Borrowing Capacity       $ 10,000,000
Notes Receivable | Notes Payable, Other Payables [Member] | AWR        
Short-term borrowing activities (excluding letters of credit)        
Notes Receivable, Related Parties, Current $ 0