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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details 4) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 27, 2015
Short-term borrowing activities (excluding letters of credit) |  |  |  |
Balance outstanding at the end of the period | $ 28,000,000 | $ 0 |  |
Syndicated revolving credit facility |  |  |  |
Note payable to banks |  |  |  |
Increase in additional aggregate bank commitments | $ 50,000,000.0 |  |  |
Variable rate basis | Euro rate |  |  |
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% |  |  |
GSWC |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |
Dividends paid | $ 62,000,000 | 52,000,000 | $ 29,400,000 |
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) |  |  |  |
Balance outstanding at the end of the period | 28,000,000 | $ 0 |  |
Dividends paid |  |  | $ 29,400,000 |
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 | 768.00% |  |  |
Total funded debt ratio | 44.00% |  |  |
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 |  |  |  |
Note payable to banks |  |  |  |
Maximum borrowing capacity | $ 25,000,000 |  |  |
Letter of credit, amount | $ 10,400,000 |  |  |
Letter of credit fee (as a percent) | 0.65% |  |  |
Notes Payable, Other Payables [Member] | GSWC |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 40,000,000
Debt Instrument, Maximum Borrowing Capacity |  |  |  | 40,000,000
Notes Payable, Other Payables [Member] | American States Utility Services [Member] |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |
Debt Instrument, Face Amount |  |  |  | 10,000,000
Debt Instrument, Maximum Borrowing Capacity |  |  |  | $ 10,000,000
Notes Receivable | Notes Payable, Other Payables [Member] | AWR |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |
Notes Receivable, Related Parties, Current | $ 0 |  |  |

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