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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details 4) (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
Syndicated revolving credit facility
      
Note payable to banks      
Increase in additional aggregate bank commitments 50,000,000.0    
Variable rate basis Euro rate    
Short-term borrowing activities (excluding letters of credit)      
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
      
Note payable to banks      
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
      
Note payable to banks      
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
      
Note payable to banks      
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
      
Note payable to banks      
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
      
Note payable to banks      
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]
      
Note payable to banks      
Letter of credit, amount 15,000,000    
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)      
Dividends paid   16,900,000 20,000,000
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 42.00%    
Total funded debt ratio 718.00%    
Interest rate spread based on A+ stable credit rating (as a percent) 1.20%    
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 25,000,000.0    
Letter of credit, amount 18,100,000.0    
AWR | Syndicated revolving credit facility | Letter of Credit - Three Valleys Municipal Water District
      
Note payable to banks      
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
      
Note payable to banks      
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
      
Note payable to banks      
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
      
Note payable to banks      
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
      
Note payable to banks      
Letter of credit, amount $ 3,600,000