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Summary of Significant Accounting Policies: (Details) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 12, 2016 | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) customer registrant | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Oct. 27, 2015 USD ($)
Basis of Presentation: |  |  |  |  |  |  |
Number of registrants filing combined report | registrant |  |  |  | 2 |  |  |
Related Party Transactions |  |  |  |  |  |  |
Notes payable to bank |  | $ 77,000,000 |  | $ 77,000,000 |  | $ 28,000,000 |
Sales and Use Taxes: |  |  |  |  |  |  |
Non-income tax assessments accounted on a gross basis |  | 4,317,000 | $ 4,326,000 | 12,863,000 | $ 12,662,000 |  |
Debt issuance costs |  | 4,400,000 | 4,700,000 | 4,400,000 | 4,700,000 | $ 4,600,000 |
AWR | Promissory Note | Notes Receivable [Member] |  |  |  |  |  |  |
Sales and Use Taxes: |  |  |  |  |  |  |
Notes receivable |  | 0 |  | 0 |  |  |
AWR | Syndicated Revolving Credit Facility [Member] |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Maximum borrowing capacity on line of credit |  | 100,000,000 |  | 100,000,000 |  |  |
GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Payments to affiliate for corporate office administrative and general costs |  | 984,000 | 659,000 | 3,000,000 | 2,000,000 |  |
Sales and Use Taxes: |  |  |  |  |  |  |
Franchise fees billed to customers and recorded as operating revenue |  | 1,100,000 |  | 3,000,000 |  |  |
Non-income tax assessments accounted on a gross basis |  | 4,018,000 | 3,842,000 | $ 11,828,000 | 11,508,000 |  |
GOLDEN STATE WATER COMPANY | Promissory Note |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 40,000,000
Debt instrument, maximum borrowing capacity |  |  |  |  |  |  | 40,000,000
GOLDEN STATE WATER COMPANY | Purchase, production, distribution and sale of water |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |
Number of customers served | customer |  |  |  | 261,000 |  |  |
GOLDEN STATE WATER COMPANY | Electricity distribution |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |
Number of customers served | customer |  |  |  | 24,000 |  |  |
ASUS |  |  |  |  |  |  |
Sales and Use Taxes: |  |  |  |  |  |  |
Non-income tax assessments accounted on a gross basis |  | $ 62,000 | $ 265,000 | $ 209,000 | $ 351,000 |  |
ASUS | Promissory Note |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | 10,000,000
Debt instrument, maximum borrowing capacity |  |  |  |  |  |  | $ 10,000,000
ASUS | Contracts |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases | 50 years |  |  | 50 years |  |  |
Sales and Use Taxes: |  |  |  |  |  |  |
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases | 50 years |  |  | 50 years |  |  |
Sales | GOLDEN STATE WATER COMPANY | Purchase, production, distribution and sale of water |  |  |  |  |  |  |
Nature of Operations: |  |  |  |  |  |  |
Percentage of total revenue |  | 90.00% | 90.00% | 90.00% | 90.00% |  |
Related Party Transaction [Domain] |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Line of Credit Facility Elective Maximum Additional Borrowing Capacity |  | $ 50,000,000 |  | $ 50,000,000 |  |  |
Related Party Transaction [Domain] | GOLDEN STATE WATER COMPANY |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |
Line of Credit Facility Elective Maximum Additional Borrowing Capacity |  | $ 150,000,000 |  | $ 150,000,000 |  |  |
Minimum [Member] | ASUS | Contracts |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 8 months |  |  |  |  |  |
Maximum [Member] | ASUS | Contracts |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 10 months |  |  |  |  |  |

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