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Regulatory Matters (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2005 | Jul. 31, 2005 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Regulatory matters: |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | $ 56,300,000 |  |
Various refunds to customers |  |  |  |  |
Regulatory matters: |  |  |  |  |
Decrease in revenues requirement to reflect the newly adopted Cost of Capital for GSWC |  |  | 961,000 |  |
Water Revenue Adjustment Mechanism [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory adjustment |  |  | 9,400,000 |  |
Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Not Accruing Carrying Costs |  |  | $ 36,200,000 |  |
General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  |  |  | $ 9,500,000
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: |  |  |  |  |
Total |  |  | $ (28,340,000) | $ 2,042,000 |
GSWC | Revenue Subject to Refund for TCJA [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | (8,293,000) | 0 |
GSWC | Various refunds to customers |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | (7,517,000) | (6,070,000) |
GSWC | Renewables Portfolio Standard [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Provision for Other Losses |  |  | 0 |  |
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 |  |  | 17,763,000 | 29,556,000 |
GSWC | Water Revenue Adjustment Mechanism [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 3,800,000 |  |
Water |  |  | 0 |  |
GSWC | Costs deferred for future recovery on Aerojet case |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 9,516,000 | 10,656,000 |
Regulatory Asset Recovery Periods |  | 20 years |  |  |
GSWC | Pension Costs and Other Postretirement Benefit Costs |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Assets |  |  | 36,200,000 |  |
Total |  |  | 33,124,000 | 33,019,000 |
GSWC | Gain (Loss) on Derivative Instruments [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 311,000 | 2,941,000 |
GSWC | Flow-through taxes, net |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | (15,300,000) | (17,700,000) |
GSWC | Deferred Income Tax Charge [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | (81,465,000) | (83,231,000) |
GSWC | Low income rate assistance balancing accounts |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 2,784,000 | 5,972,000 |
GSWC | Other regulatory assets, net |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | 15,656,000 | 16,393,000 |
GSWC | General Rate Case Memorandum Accounts [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Total |  |  | $ 5,054,000 | $ 10,522,000 |
GSWC | Cost of Capital, Proceeding for Water Regions [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Return on Equity Percentage |  |  | 8.90% |  |
Weighted Cost of Capital Percent |  |  | 7.91% |  |
Electric Service Utility Operations [Member] | 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 |  |  | $ 1,200,000 |  |
Electric Service Utility Operations [Member] | Pending General Rate Case [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Return on Equity Percentage |  |  | 9.60% |  |
Settlement Agreement Proposed Authorized Return on Equity Percentage |  |  | 9.95% |  |
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 |  |  | $ (3,034,000) |  |
Regulatory Assets |  |  | $ 3,000,000 |  |

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- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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