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Long-Term Debt (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 24, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Jul. 08, 2020 | Dec. 31, 2013
GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 0.4288 |  |  |
Ratio of Indebtedness to EBITDA |  | 3.2 |  |  |
GSWC | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ratio of Indebtedness to Net Capital |  | 0.6667 |  |  |
Ratio of Indebtedness to EBITDA |  | 8 |  |  |
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 Price, Percentage | 3.00% |  |  |  |
Redemption Price Of Debt Instrument | $ 840,000 |  |  |  |
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] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 40,000,000 |  |  |
Interest rate (as a percent) |  | 5.87% | 5.87% |  |
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 |  |  |
Interest rate (as a percent) |  | 3.45% | 3.45% |  |
Private Placement Notes [Member] | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 160,000,000 |
Debt Instrument Redemption Premium above Treasury Yield |  | 50.00% |  |  |
2.17% notes due 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) |  | 2.17% | 2.17% |  |
2.17% notes due 2030 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 85,000,000 |
Interest rate (as a percent) |  | 2.17% | 2.17% | 2.17% |
2.90% notes due 2040 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate (as a percent) |  | 2.90% | 2.90% |  |
2.90% notes due 2040 | GSWC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 75,000,000 |
Interest rate (as a percent) |  | 2.90% | 2.90% | 2.90% |

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