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Contingencies and Gain on Sale of Assets (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 08, 2017 USD ($) connection | Oct. 31, 2017 USD ($) customer | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets |  |  |  |  | $ 34,324,000 | $ 0 |
Amount spent in clean-up and remediation activities [Abstract] |  |  |  |  | 1,500,000 |  |
Utility plant |  |  |  | $ 1,181,616,000 | 1,181,616,000 | 1,128,588,000 | $ 1,150,926,000
Accounts receivable |  |  |  | 29,392,000 | 29,392,000 |  | 19,993,000
Total Assets |  |  |  | 1,486,486,000 | 1,486,486,000 | 1,440,386,000 | 1,470,493,000
Advances for construction |  |  |  | (67,438,000) | (67,438,000) |  | (69,722,000)
Contributions in aid of construction - net |  |  |  | 123,569,000 | 123,569,000 |  | 120,518,000
GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Environmental Remediation Expense |  |  |  |  | 5,200,000 |  |
Proceeds from sale of assets |  |  |  |  | 34,324,000 | $ 0 |
Utility plant |  |  |  | 1,175,343,000 | 1,175,343,000 |  | 1,145,311,000
Accounts receivable |  |  |  | 29,392,000 | 29,392,000 |  | 19,993,000
Regulatory assets |  |  |  | 130,906,000 | 130,906,000 |  | 146,281,000
Total Assets |  |  |  | 1,405,198,000 | 1,405,198,000 |  | 1,384,178,000
Advances for construction |  |  |  | (67,438,000) | (67,438,000) |  | (69,722,000)
Contributions in aid of construction - net |  |  |  | 123,569,000 | 123,569,000 |  | 120,518,000
Environmental Clean-Up and Remediation | GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrued liability for the estimated additional cost to complete the clean-up at the site |  |  |  | 1,400,000 | 1,400,000 |  |
City of Claremont [Member] | GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  | $ 5,900,000 |  |
Ojai Water System |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency number of customers served | connection | 2,900 |  |  |  |  |  |
Utility plant | $ 22,256,000 |  |  |  |  |  |
Accounts receivable | 721,000 |  |  |  |  |  |
Regulatory assets | 3,944,000 |  |  |  |  |  |
Total Assets | 26,921,000 |  |  |  |  |  |
Advances for construction | (366,000) |  |  |  |  |  |
Contributions in aid of construction - net | 532,000 |  |  |  |  |  |
Liabilities | (898,000) |  |  |  |  |  |
Ojai Water System | GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Proceeds from sale of assets | $ 34,300,000 |  |  |  |  |  |
Gain (loss) on sale of properties |  |  |  | $ 8,300,000 |  |  |
Maximum | City of Claremont [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  |  |  | $ 7,600,000
Subsequent Event |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation Settlement, Expense |  | $ 895,000 |  |  |  |  |
Subsequent Event | City of Claremont [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Registration Payment Arrangement, Period |  | 12 years |  |  |  |  |
Subsequent Event | City of Claremont [Member] | Condemnation of Properties | GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency number of customers served | customer |  | 11,000 |  |  |  |  |
Scenario, Forecast [Member] | Subsequent Event | City of Claremont [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  | $ 2,000,000 |  |  |  |

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