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Regulatory Matters (Details 7) (GSWC, CPUC Subpoena) | 1 Months Ended
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Dec. 31, 2014 | Dec. 31, 2011 Audit
GSWC | CPUC Subpoena |  |
Regulatory matters: |  |
Number of separate independent audits of procurement practices agreed as a part of the settlement agreement |  | 3 awr_NumberOfSeparateIndependentAuditsOfProcurementPracticesAgreedUnderSettlementAgreement / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryLiabilityAxis = awr_SubpoenaMember
Period of separate independent audits of procurement practices agreed as a part of 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
Name: | awr_NumberOfSeparateIndependentAuditsOfProcurementPracticesAgreedUnderSettlementAgreement
Namespace Prefix: | awr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

X
- Details
Name: | awr_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration