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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 |  |

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