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v3.6.0.2

Long-Term Debt (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 16, 2014 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 | Dec. 23, 2014 USD ($)
GSWC |  |  |  |
Long-term debt |  |  |  |
Ratio of Indebtedness to Net Capital |  | 0.4680 |  |
Ratio of Indebtedness to EBITDA |  | 2.9 |  |
Redemption price of debt instrument, as a percentage of principal amount | 100.00% |  |  |
GSWC | Maximum [Member] |  |  |  |
Long-term debt |  |  |  |
Ratio of Indebtedness to Net Capital |  | 0.6667 |  |
Ratio of Indebtedness to EBITDA |  | 8 |  |
Private Placement Notes [Member] | GSWC |  |  |  |
Long-term debt |  |  |  |
Interest coverage ratio |  | 400.00% |  |
Private Placement Notes [Member] | GSWC | Minimum |  |  |  |
Long-term debt |  |  |  |
Interest coverage ratio |  | 200.00% |  |
Private placement notes |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  | 9.56% | 9.56% |
Private placement notes | GSWC |  |  |  |
Long-term debt |  |  |  |
Debt Instrument, Face Amount |  | $ 28,000,000 |  |
Interest rate (as a percent) |  | 9.56% | 9.56% |
Debt Instrument Redemption Premium above Treasury Yield |  | 5500.00% |  |
Private placement notes | GSWC | Maximum [Member] |  |  |  |
Long-term debt |  |  |  |
Redemption premium after 2021 (as a percent) |  | 3.00% |  |
Private placement notes | American States Utility Services [Member] |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  | 9.56% |  |
Debt issues other than 9.56% Notes and Senior Notes issued to Co-Bank | GSWC | Maximum [Member] |  |  |  |
Long-term debt |  |  |  |
Debt Instrument Redemption Premium as Percentage of Par Value |  | 0.00% |  |
Senior Notes issued to Co-Bank | GSWC |  |  |  |
Long-term debt |  |  |  |
Additional spread on premium (as a percent) |  | 0.50% |  |
American Recovery and Reinvestment Act Obligation due 2033 | GSWC |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  | 2.50% |  |
Notes Payable 3.45 Percent Due 2029 [Member] |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  | 3.45% | 3.45% |
Notes Payable 3.45 Percent Due 2029 [Member] | GSWC |  |  |  |
Long-term debt |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 15,000,000
Interest rate (as a percent) |  | 3.45% | 3.45% |
Notes Payable 6.87 Percent Due 2023 [Member] | GSWC |  |  |  |
Long-term debt |  |  |  |
Principal amount of notes redeemed | $ 5,000,000 |  |  |
Interest rate (as a percent) |  | 6.87% |  |
Notes Payable 7 Percent Due 2023 [Member] | GSWC |  |  |  |
Long-term debt |  |  |  |
Principal amount of notes redeemed | $ 10,000,000 |  |  |
Interest rate (as a percent) |  | 7.00% |  |

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