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Bank Debt (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Short-term borrowing activities (excluding letters of credit)    
Balance outstanding at the end of the period $ 59,000,000 $ 90,000,000
Short-term borrowing (excluding letters of credit)    
Short-term borrowing activities (excluding letters of credit)    
Balance outstanding at the end of the period $ 59,000,000 $ 90,000,000
Interest Rate at the end of the period (as a percent) 2.28% 1.46%
Average amount outstanding $ 65,242,000 $ 59,261,000
Weighted Average Annual Interest Rate (as a percent) 1.69% 1.20%
Maximum Amount Outstanding $ 102,500,000 $ 96,000,000
Syndicated revolving credit facility    
Bank debt    
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%  
Syndicated revolving credit facility | Letter of Credit Irrevocable Franchise Agreement with City of Rancho Cordova [Member]    
Bank debt    
Letter of credit, amount $ 15,000,000  
AWR    
Bank debt    
Maximum borrowing capacity 150,000,000  
Short-term borrowing activities (excluding letters of credit)    
Balance outstanding at the end of the period $ 59,000,000 $ 90,000,000
AWR | Syndicated revolving credit facility    
Short-term borrowing activities (excluding letters of credit)    
Interest coverage ratio 754.00%  
Total funded debt ratio 42.00%  
AWR | Syndicated revolving credit facility | Minimum    
Short-term borrowing activities (excluding letters of credit)    
Interest coverage ratio 325.00%  
Total funded debt ratio 65.00%  
AWR | Syndicated revolving credit facility | Maximum    
Short-term borrowing activities (excluding letters of credit)    
Total funded debt ratio 100.00%  
AWR | Syndicated revolving credit facility | Letters of credit    
Bank debt    
Maximum borrowing capacity $ 25,000,000  
Letter of credit, amount $ 6,300,000  
Letter of credit fee (as a percent) 0.65%  
AWR | Syndicated revolving credit facility | Letter of Credit Business Automobile Insurance Policy Security [Member]    
Bank debt    
Letter of credit, amount $ 340,000  
AWR | Syndicated revolving credit facility | Letter of Credit - Purchase of power    
Bank debt    
Letter of credit, amount 585,000,000  
AWR | Syndicated revolving credit facility | Letter of Credit - American Recovery and Reinvestment Act    
Bank debt    
Letter of credit, amount $ 5,400,000