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Regulatory Matters (Details 9) (GSWC, USD $) In Thousands, unless otherwise specified | 1 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 renewable_energy | Dec. 31, 2014 | Dec. 31, 2013
Regulatory matters: |  |  |
Net regulatory assets |  | $ 125,704 us-gaap_NetRegulatoryAssets | $ 122,681 us-gaap_NetRegulatoryAssets
Renewables Portfolio Standard |  |  |
Regulatory matters: |  |  |
Agreement period to purchase renewable energy credits | 10 years |  |
Number of renewable energy credits that would be purchased | 582,000 awr_PurchasedRenewableEnergyCreditsNumber / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_RenewablesPortfolioStandardMember |  |

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- Definition Represents the period of agreement with a third party to purchase renewable energy credits. + References No definition available. + Details
Name: | awr_PeriodOfAgreementForPurchaseOfRenewableEnergyCredits
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of renewable energy credits that would be purchased over a contractual period of time. + References No definition available. + Details
Name: | awr_PurchasedRenewableEnergyCreditsNumber
Namespace Prefix: | awr_
Data Type: | xbrli:integerItemType
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 The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_NetRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant