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Bank Debt (Details)
 6 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 01, 2020
USD ($)
Bank debt        
Maximum borrowing capacity $ 260,000,000.0 $ 260,000,000.0    
Line of Credit Facility, Current Borrowing Capacity 200,000,000.0 200,000,000.0    
Short-term borrowing activities (excluding letters of credit)        
Notes Payable to Bank $ 134,200,000 $ 134,200,000    
Bear Valley Electric Service, Inc.        
Bank debt        
Maximum borrowing capacity       $ 35,000,000.0
Debt instrument, term 3 years 3 years    
Incremental expansion of borrowing capacity $ 15,000,000.0 $ 15,000,000.0   $ 35,000,000.0
Notes Payable 20,200,000 20,200,000    
Long-term Debt [Member]        
Bank debt        
Notes Payable, Current 134,200,000 134,200,000 $ 205,000,000  
Short-term borrowing activities (excluding letters of credit)        
Notes Payable, Current $ 134,200,000 134,200,000 $ 205,000,000  
Short-term borrowing (excluding letters of credit)        
Bank debt        
Interest Rate at the end of the period (as a percent)     2.44%  
Average Amount Outstanding   $ 162,995,000 $ 167,392,000  
Weighted Average Annual Interest Rate (as a percent) 1.47% 1.47% 2.88%  
Maximum Amount Outstanding   $ 249,200,000 $ 205,500,000  
Short-term borrowing activities (excluding letters of credit)        
Weighted Average Annual Interest Rate (as a percent) 1.47% 1.47% 2.88%  
Average Amount Outstanding   $ 162,995,000 $ 167,392,000  
Maximum Amount Outstanding   249,200,000 $ 205,500,000  
Interest Rate at the end of the period (as a percent)     2.44%  
Average amount outstanding   $ 162,995,000 $ 167,392,000  
Short-term borrowing (excluding letters of credit) | Minimum        
Bank debt        
Interest Rate at the end of the period (as a percent) 1.19% 1.19%    
Short-term borrowing activities (excluding letters of credit)        
Interest Rate at the end of the period (as a percent) 1.19% 1.19%    
Short-term borrowing (excluding letters of credit) | Maximum        
Bank debt        
Interest Rate at the end of the period (as a percent) 1.90% 1.90%    
Short-term borrowing activities (excluding letters of credit)        
Interest Rate at the end of the period (as a percent) 1.90% 1.90%    
Syndicated revolving credit facility        
Bank debt        
Variable rate basis   Euro rate    
Syndicated revolving credit facility | Bear Valley Electric Service, Inc.        
Bank debt        
Interest coverage ratio   35.6    
Total funded debt ratio   0.24    
Short-term borrowing activities (excluding letters of credit)        
Interest coverage ratio   35.6    
Total funded debt ratio   0.24    
Syndicated revolving credit facility | Minimum        
Bank debt        
Interest coverage ratio   3.25    
Short-term borrowing activities (excluding letters of credit)        
Interest coverage ratio   3.25    
Syndicated revolving credit facility | Maximum        
Bank debt        
Total funded debt ratio   0.65    
Short-term borrowing activities (excluding letters of credit)        
Total funded debt ratio   0.65    
AWR        
Bank debt        
Line of Credit Facility, Current Borrowing Capacity $ 200,000,000.0 $ 200,000,000.0    
AWR | Long-term Debt [Member]        
Bank debt        
Notes Payable, Current 114,000,000 114,000,000 205,000,000  
Short-term borrowing activities (excluding letters of credit)        
Notes Payable, Current $ 114,000,000 $ 114,000,000 $ 205,000,000  
AWR | Short-term borrowing (excluding letters of credit)        
Bank debt        
Interest Rate at the end of the period (as a percent) 1.19% 1.19% 2.44%  
Average Amount Outstanding   $ 160,495,000 $ 167,392,000  
Weighted Average Annual Interest Rate (as a percent) 1.47% 1.47% 2.88%  
Maximum Amount Outstanding   $ 249,000,000 $ 205,500,000  
Short-term borrowing activities (excluding letters of credit)        
Weighted Average Annual Interest Rate (as a percent) 1.47% 1.47% 2.88%  
Average Amount Outstanding   $ 160,495,000 $ 167,392,000  
Maximum Amount Outstanding   $ 249,000,000 $ 205,500,000  
Interest Rate at the end of the period (as a percent) 1.19% 1.19% 2.44%  
Average amount outstanding   $ 160,495,000 $ 167,392,000  
AWR | Syndicated revolving credit facility        
Bank debt        
Interest coverage ratio   7.74    
Total funded debt ratio   0.47    
Short-term borrowing activities (excluding letters of credit)        
Interest coverage ratio   7.74    
Total funded debt ratio   0.47    
AWR | Syndicated revolving credit facility | Bear Valley Electric Service, Inc.        
Bank debt        
Total funded debt ratio   0.65    
Short-term borrowing activities (excluding letters of credit)        
Total funded debt ratio   0.65    
AWR | Syndicated revolving credit facility | Minimum        
Bank debt        
Interest coverage ratio   3.25    
Total funded debt ratio   0.65    
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        
Bank debt        
Total funded debt ratio   1.00    
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 $ 25,000,000.0    
Letter of credit, amount $ 455,000 $ 455,000    
Letter of credit fee (as a percent)   0.65%