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v2.4.1.9

Summary of Significant Accounting Policies: (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 registrant | Mar. 31, 2014 | May 31, 2013
Basis of Presentation: |  |  |
Number of registrants filing combined report | 2 awr_NumberOfRegistrantsFilingCombinedReport |  |
Related Party Transactions |  |  |
Amounts outstanding under note | $ 0 us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent |  |
Sales and Use Taxes: |  |  |
Non-income tax assessments accounted on a gross basis | 4,276,000 us-gaap_TaxesExcludingIncomeAndExciseTaxes | 4,325,000 us-gaap_TaxesExcludingIncomeAndExciseTaxes |
Debt Issuance Cost | 5,100,000 us-gaap_UnamortizedDebtIssuanceExpense |  |
AWR | Promissory Note |  |  |
Related Party Transactions |  |  |
Debt instrument, face amount |  |  | 20,000,000.0 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Debt instrument, maximum borrowing capacity |  |  | 20,000,000.0 awr_DebtInstrumentMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
AWR | Syndicated Credit Facility |  |  |
Related Party Transactions |  |  |
Maximum borrowing capacity on line of credit | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_SyndicatedRevolvingCreditFacilityMember |  |
GOLDEN STATE WATER COMPANY |  |  |
Related Party Transactions |  |  |
Payments to affiliate for corporate office administrative and general costs | 707,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 696,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |
Sales and Use Taxes: |  |  |
Franchise fees billed to customers and recorded as operating revenue | 871,000 us-gaap_CostOfReimbursableExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 845,000 us-gaap_CostOfReimbursableExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |
Non-income tax assessments accounted on a gross basis | 3,918,000 us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | 3,896,000 us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |
GOLDEN STATE WATER COMPANY | Purchase, production, distribution and sale of water |  |  |
Nature of Operations: |  |  |
Number of customers served | 258,000 awr_NumberOfCustomers / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  |
GOLDEN STATE WATER COMPANY | Electricity distribution |  |  |
Nature of Operations: |  |  |
Number of customers served | 24,000 awr_NumberOfCustomers / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  |
ASUS |  |  |
Sales and Use Taxes: |  |  |
Non-income tax assessments accounted on a gross basis | $ 32,000 us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember | $ 149,000 us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember |
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 |  |
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 |  |
Sales | GOLDEN STATE WATER COMPANY | Purchase, production, distribution and sale of water |  |  |
Nature of Operations: |  |  |
Percentage of total revenue | 90.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  |

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