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Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Regulatory matters: |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party |  | $ 2,600,000 |  |  |
Estimated Litigation Liability, Noncurrent |  | 3,500,000 | $ 3,500,000 |  |
Water Revenue Adjustment Mechanism [Member] | GOLDEN STATE WATER COMPANY |  |  |  |  |
Regulatory matters: |  |  |  |  |
Deferred Revenue |  | $ 450,000 | $ 450,000 | $ 910,000 | $ 1,400,000
Minimum | General Rate Case Memorandum Accounts [Member] | GOLDEN STATE WATER COMPANY |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |  |
Maximum [Member] | General Rate Case Memorandum Accounts [Member] | GOLDEN STATE WATER COMPANY |  |  |  |  |
Regulatory matters: |  |  |  |  |
Regulatory Asset Recovery Periods |  |  | 36 months |  |
City of Claremont [Member] | GOLDEN STATE WATER COMPANY |  |  |  |  |
Regulatory matters: |  |  |  |  |
Litigation Settlement, Expense |  |  | $ 5,900,000 |  |
City of Claremont [Member] | Maximum [Member] |  |  |  |  |
Regulatory matters: |  |  |  |  |
Litigation Settlement, Expense |  |  |  | $ 7,600,000 |
Subsequent Event |  |  |  |  |
Regulatory matters: |  |  |  |  |
Litigation Settlement, Expense | $ 895,000 |  |  |  |

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