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Bank Debt (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Jun. 30, 2020
Feb. 11, 2020
Mar. 31, 2019
Bank debt            
Maximum borrowing capacity $ 225,000,000.0          
Short-term borrowing activities (excluding letters of credit)            
Balance outstanding at the end of the period 205,000,000.0          
Notes payable to banks 5,000,000 $ 0        
Long-term Debt [Member]            
Short-term borrowing activities (excluding letters of credit)            
Balance outstanding at the end of the period $ 205,000,000.0          
Short-term borrowing (excluding letters of credit)            
Short-term borrowing activities (excluding letters of credit)            
Notes payable to banks   $ 95,500,000        
Interest Rate at the end of the period (as a percent) 2.44% 3.19%        
Average amount outstanding $ 167,392,000 $ 69,559,000        
Weighted Average Annual Interest Rate (as a percent) 2.88% 2.66%        
Maximum Amount Outstanding $ 205,500,000 $ 95,500,000        
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 3.25          
Syndicated revolving credit facility | Maximum            
Short-term borrowing activities (excluding letters of credit)            
Total funded debt ratio 0.65          
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 225,000,000.0          
Short-term borrowing activities (excluding letters of credit)            
Notes payable to banks $ 5,000,000 $ 0        
AWR | Syndicated revolving credit facility            
Short-term borrowing activities (excluding letters of credit)            
Interest coverage ratio 6.89          
Total funded debt ratio 0.45          
AWR | Syndicated revolving credit facility | Minimum            
Short-term borrowing activities (excluding letters of credit)            
Interest coverage ratio 3.25          
Total funded debt ratio 0.65          
AWR | Syndicated revolving credit facility | Maximum            
Short-term borrowing activities (excluding letters of credit)            
Total funded debt ratio 1.00          
AWR | Syndicated revolving credit facility | Letters of credit            
Bank debt            
Maximum borrowing capacity $ 25,000,000.0          
Letter of credit, amount $ 940,000          
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          
Syndicated revolving credit facility | AWR            
Bank debt            
Maximum borrowing capacity           $ 200,000,000.0
Syndicated revolving credit facility | AWR | Minimum            
Bank debt            
Line of Credit Facility, Current Borrowing Capacity           $ 150,000,000.0
Subsequent Event [Member] | AWR            
Bank debt            
Maximum borrowing capacity     $ 200,000,000.0 $ 200,000,000.0 $ 260,000,000.0