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v3.19.3.a.u2

Long-Term Debt (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2014 | Dec. 31, 2013
GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ratio of Indebtedness to Net Capital | 0.4445 |  |  |  |
Ratio of Indebtedness to EBITDA | 3.1 |  |  |  |
GSWC | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ratio of Indebtedness to Net Capital | 0.6667 |  |  |  |
Ratio of Indebtedness to EBITDA | 8 |  |  |  |
Private Placement Notes [Member] | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest coverage ratio | 4 |  |  |  |
Private Placement Notes [Member] | GSWC | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest coverage ratio | 2 |  |  |  |
9.56% notes due 2031 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 9.56% |  | 9.56% |  |
9.56% notes due 2031 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 28,000,000 |  |  |  |
Interest rate (as a percent) | 9.56% |  | 9.56% |  |
Debt Instrument Redemption Premium above Treasury Yield | 0.055% |  |  |  |
9.56% notes due 2031 | GSWC | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption premium after 2021 (as a percent) | 3.00% |  |  |  |
9.56% notes due 2031 | American States Utility Services [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 9.56% |  |  |  |
5.87% notes due 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 5.87% |  | 5.87% |  |
5.87% notes due 2028 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 5.87% |  | 5.87% |  |
5.87% notes due 2028 | American States Utility Services [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 5.87% |  |  |  |
6.70% notes due 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 6.70% |  | 6.70% |  |
6.70% notes due 2019 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Annual Principal Payment |  | $ 40,000,000 |  |  |
Interest rate (as a percent) | 6.70% | 6.70% | 6.70% |  |
Senior Notes issued to Co-Bank | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Additional spread on premium (as a percent) | 0.50% |  |  |  |
American Recovery and Reinvestment Act Obligation due 2033 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 2.50%
3.45% notes due 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) | 3.45% |  | 3.45% |  |
3.45% notes due 2029 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount | $ 15,000,000.0 |  |  | $ 15,000,000.0 |
Interest rate (as a percent) | 3.45% |  | 3.45% | 3.45% |

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