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Summary of Significant Accounting Policies: (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 registrant | Sep. 30, 2013 | May 31, 2013 AWR Promissory Note | Sep. 30, 2014 AWR Syndicated Credit Facility | Sep. 30, 2014 GSWC | Sep. 30, 2013 GSWC | Sep. 30, 2014 GSWC | Sep. 30, 2013 GSWC | Sep. 30, 2014 GSWC Purchase, production, distribution and sale of water customer | Sep. 30, 2014 GSWC Electricity distribution customer | Sep. 30, 2014 ASUS | Sep. 30, 2013 ASUS | Sep. 30, 2014 ASUS | Sep. 30, 2013 ASUS | Sep. 30, 2014 ASUS Contracts | May 23, 2013 Fourth Amendment to Revolving Credit Agreement AWR Syndicated Credit Facility | Jul. 15, 2014 6.87% Medium-Term Notes Series A GSWC | Jul. 15, 2014 7.00% Medium-Term Notes Series A GSWC | Jul. 15, 2014 Medium-term Notes [Member] GSWC | Sep. 30, 2014 Sales GSWC Purchase, production, distribution and sale of water
Nature of Operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers served |  |  |  |  |  |  |  |  |  |  | 257,000 | 24,000 |  |  |  |  |  |  |  |  |  |
Percentage of total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00%
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 years |  |  |  |  |
Basis of Presentation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of registrants filing combined report |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 10,000,000 |  |
Debt instrument, maximum borrowing capacity |  |  |  |  | 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on line of credit |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  | 100,000,000.0 |  |  |  |
Long term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.87% | 7.00% |  |
Debt instrument, face amount |  |  |  |  | 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 10,000,000 |  |
Repurchase amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Notes Payable to Banks: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity on line of credit |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  | 100,000,000.0 |  |  |  |
Maximum borrowing capacity on line of credit, potential election to increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000.0 |  |  |  |
Sales and Use Taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Franchise fees billed to customers and recorded as operating revenue |  |  |  |  |  |  | 1,074,000 | 1,000,000 | 2,900,000 | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 years |  |  |  |  |
Non-income tax assessments accounted on a gross basis | 4,359,000 | 4,108,000 | 12,649,000 | 12,004,000 |  |  | 3,879,000 | 3,572,000 | 11,305,000 | 10,663,000 |  |  | 248,000 | 305,000 | 554,000 | 636,000 |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  | $ 2,000,000 | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |

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