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Regulatory Matters (Details 4) (GSWC, USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Jul. 31, 2005 | Dec. 31, 2014 | Oct. 31, 2005
Costs deferred for future recovery on Aerojet case |  |  |
Regulatory matters: |  |  |
Increase in Revenue Requirement, Recoverable through Surcharges | $ 21.3 awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostsDeferredForFutureRecoveryOnAerojetCaseMember |  |
Recovery period | 20 years |  |
Reimbursement to recover costs |  | 17.5 us-gaap_ReimbursementRevenue / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostsDeferredForFutureRecoveryOnAerojetCaseMember |
Costs deferred for future recovery on Aerojet case | Maximum |  |  |
Regulatory matters: |  |  |
Recovery period |  |  | 20 years
Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member] |  |  |
Regulatory matters: |  |  |
Amount billed to customers as surcharges |  | $ 14.3 awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember |

X
- Definition Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs. + References No definition available. + Details
Name: | awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents amount billed to customers as surcharges. + References No definition available. + Details
Name: | awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the recovery periods of the surcharge billed to the customers. + References No definition available. + Details
Name: | awr_RegulatoryAssetRecoveryPeriods
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

X
- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60722-111653 + Details
Name: | us-gaap_ReimbursementRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration