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Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - GOLDEN STATE WATER COMPANY - Audit | 1 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2014
Regulatory matters: |  |
Separate independent audits | 3 |
Number of Years of Separate Independent Audits of Procurement Practices Agreed under Settlement Agreement | 10 years |
Period of Separate Independent Audits of Procurement Practices Covered by Report |  | 20 years

X
- Definition Represents the number of separate independent audits of procurement practices agreed as a part of the settlement agreement. + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Years of Separate Independent Audits of Procurement Practices Agreed under Settlement Agreement + References No definition available. + Details
Name: | awr_NumberofYearsofSeparateIndependentAuditsofProcurementPracticesAgreedunderSettlementAgreement
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of Separate Independent Audits of Procurement Practices Covered by Report + References No definition available. + Details
Name: | awr_PeriodofSeparateIndependentAuditsofProcurementPracticesCoveredbyReport
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | awr_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |