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Regulatory Matters 6 (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 renewable_energy | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2019 USD ($)
Regulatory matters: |  |  |  |
Regulatory asset authorized under settlement |  | $ 2,700,000 |  |
Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |
Regulatory matters: |  |  |  |
Weighted Cost of Capital Percent |  | 8.34% |  |
Settlement Agreement Proposed Authorized Return on Equity Percentage |  | 9.43% |  |
GSWC |  |  |  |
Regulatory matters: |  |  |  |
Net regulatory assets |  | $ (2,450,000) | $ (28,340,000) |
GSWC | Renewables Portfolio Standard [Member] |  |  |  |
Regulatory matters: |  |  |  |
Derivative, Term of Contract | 10 years |  |  |
Number of renewable energy credits that would be purchased | renewable_energy | 578,000 |  |  |
Provision for Other Losses |  | $ 0 |  |
GSWC | Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |
Regulatory matters: |  |  |  |
Return on Equity Percentage |  | 8.90% |  |
Weighted Cost of Capital Percent |  | 7.91% |  |
GSWC | Other Regulatory Assets (Liabilities) [Member] |  |  |  |
Regulatory matters: |  |  |  |
Net regulatory assets |  |  |  | $ 1,100,000
Electric general rate case [Member] [Member] | Revenues retroactive due to GRC delay [Member] |  |  |  |
Regulatory matters: |  |  |  |
Regulatory adjustment |  |  | 2,300,000 |
Electric Service Utility Operations [Member] | Electric general rate case [Member] [Member] |  |  |  |
Regulatory matters: |  |  |  |
Return on Equity Percentage |  | 9.60% |  |
Settlement Agreement Proposed Authorized Return on Equity Percentage |  | 9.95% |  |
Various refunds to customers |  |  |  |
Regulatory matters: |  |  |  |
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC |  | $ 982,000 |  |
Various refunds to customers | GSWC |  |  |  |
Regulatory matters: |  |  |  |
Net regulatory assets |  | $ (8,478,000) | $ (7,517,000) |
Water Service Utility Operations [Member] |  |  |  |
Regulatory matters: |  |  |  |
Number of parties |  | 3 |  |
Electric Service Utility Operations [Member] |  |  |  |
Regulatory matters: |  |  |  |
Number of parties |  | 2 |  |

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