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Bank Debt (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Short-term borrowing activities (excluding letters of credit)      
Balance outstanding at the end of the period     $ 60,900,000
Total funded debt ratio 65.00%    
Short-term borrowing (excluding letters of credit)
      
Short-term borrowing activities (excluding letters of credit)      
Balance outstanding at the end of the period 0 0 2,000,000
Interest Rate at the end of the period (as a percent) 0.82% 1.41% 1.51%
Average amount outstanding 0 885,000 25,713,000
Weighted Average Annual Interest Rate (as a percent) 1.02% 1.49% 1.46%
Maximum Amount Outstanding 0 6,000,000 64,900,000
Revolving Credit Facility | Irrevocable Letter of Credit - Edison Settlement agreement
      
Bank debt      
Letter of credit, amount 3,600,000    
Syndicated revolving credit facility
      
Bank debt      
Increase in additional aggregate bank commitments 50,000,000.0    
Variable rate basis Euro rate    
Interest rate spread based on A+ stable credit rating (as a percent) 1.20%    
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% 65.00% 65.00%
Syndicated revolving credit facility | Letters of credit
      
Bank debt      
Maximum borrowing capacity 25,000,000.0    
Letter of credit, amount 18,100,000    
Syndicated revolving credit facility | Letter of Credit - Three Valleys Municipal Water District
      
Bank debt      
Letter of credit, amount 6,300,000    
Letter of credit fee (as a percent) 1.20%    
Syndicated revolving credit facility | Letter of Credit - GSWC business automobile insurance policy
      
Bank debt      
Letter of credit, amount 440,000,000    
Letter of credit fee (as a percent) 1.20%    
Syndicated revolving credit facility | Letter of Credit - Purchase of power
      
Bank debt      
Letter of credit, amount 585,000,000    
Letter of credit fee (as a percent) 1.20%    
Syndicated revolving credit facility | Letter of Credit - American Recovery and Reinvestment Act
      
Bank debt      
Letter of credit, amount 7,200,000    
Letter of credit fee (as a percent) 1.20%    
Percentage of funds received for reimbursement of costs 80.00%    
Letters of credit | 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 100,000,000.0    
AWR | Syndicated revolving credit facility
      
Bank debt      
Increase in additional aggregate bank commitments 50,000,000.0    
Interest rate spread based on A+ stable credit rating (as a percent) 1.20%    
Short-term borrowing activities (excluding letters of credit)      
Interest coverage ratio 42.00%    
Total funded debt ratio 718.00%    
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
      
Bank debt      
Maximum borrowing capacity 25,000,000.0    
Letter of credit, amount 18,100,000.0    
AWR | Syndicated revolving credit facility | Letter of Credit - Three Valleys Municipal Water District
      
Bank debt      
Letter of credit, amount 6,300,000.0    
Letter of credit fee (as a percent) 1.20%    
AWR | Syndicated revolving credit facility | Letter of Credit - GSWC business automobile insurance policy
      
Bank debt      
Letter of credit, amount 440,000,000    
Letter of credit fee (as a percent) 1.20%    
AWR | Syndicated revolving credit facility | Letter of Credit - Purchase of power
      
Bank debt      
Letter of credit, amount 585,000    
Letter of credit fee (as a percent) 1.20%    
AWR | Syndicated revolving credit facility | Letter of Credit - American Recovery and Reinvestment Act
      
Bank debt      
Letter of credit, amount 7,200,000    
Letter of credit fee (as a percent) 1.20%    
Percentage of funds received for reimbursement of costs 80.00%    
AWR | Syndicated revolving credit facility | Irrevocable Letter of Credit - Edison Settlement agreement
      
Bank debt      
Letter of credit, amount $ 3,600,000