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Regulatory Matters (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2005 | Jul. 31, 2005 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Regulatory matters: |  |  |  |  |
Regulatory Assets |  |  | $ 2,700,000 |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | 43,100,000 |  |
Various refunds to customers |  |  |  |  |
Regulatory matters: |  |  |  |  |
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC |  |  | 982,000 |  |
Water Revenue Adjustment Mechanism [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory adjustment |  |  | 16,300,000 |  |
Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | 43,400,000 |  |
GSWC |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | (2,450,000) | $ (28,340,000) |
GSWC | Revenue Subject to Refund for TCJA [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 0 | (8,293,000) |
GSWC | Various refunds to customers |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | (8,478,000) | (7,517,000) |
GSWC | Revenue Subject to Refund for TCJA [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 impact |  |  |  | 7,100,000 |
GSWC | WRAM, net of MCBA |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 22,535,000 | 17,763,000 |
GSWC | Water Revenue Adjustment Mechanism [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 11,000,000.0 |  |
Water |  |  | 0 |  |
GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 8,292,000 | 9,516,000 |
Regulatory Asset Recovery Periods |  | 20 years |  |  |
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Assets |  |  | 43,400,000 |  |
Total |  |  | 40,693,000 | 33,124,000 |
GSWC | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 3,171,000 | 311,000 |
GSWC | Flow-through taxes, net |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | (12,439,000) | (15,273,000) |
GSWC | Deferred Income Tax Charge [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | (79,886,000) | (81,465,000) |
GSWC | Other regulatory assets, net |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 18,842,000 | 18,440,000 |
GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | $ 4,820,000 | 5,054,000 |
GSWC | Other Regulatory Assets (Liabilities) [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  |  |  | $ 1,100,000
Electric general rate case [Member] [Member] | Revenues retroactive due to GRC delay [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory adjustment |  |  |  | $ 2,300,000 |
Minimum | GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |  |
Maximum | GSWC | WRAM, net of MCBA |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |  |
Maximum | GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods | 20 years |  |  |  |
Maximum | GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 36 months |  |
Under Collection in Two Way Pension Balancing Account [Member] | GSWC | Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory adjustment |  |  | $ (2,700,000) |  |

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