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Regulatory Matters: (Details 5) (GSWC, USD $) |  |  | 1 Months Ended | 6 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Mar. 31, 2013 BVES General Rate Case | Aug. 31, 2012 BVES General Rate Case | Mar. 31, 2012 BVES General Rate Case | Jun. 30, 2013 BVES General Rate Case | Dec. 31, 2012 Renewables Portfolio Standard | Dec. 31, 2012 Renewables Portfolio Standard RECs | Jun. 30, 2013 Renewables Portfolio Standard
Regulatory matters: |  |  |  |  |  |  |  |  |
Amount of retroactive ratemaking proposal included in DRA's recommendation to increase accumulated depreciation |  |  |  | $ 2,000,000 |  |  |  |  |
Net regulatory assets | 184,893,000 | 176,015,000 |  |  |  | 2,000,000 |  |  |
Portion of deferred rate case costs required to be written off, if DRA prevails |  |  |  |  |  | 50.00% |  |  |
Provision for loss |  |  |  |  |  |  |  |  | 0
Number of renewable energy credits that would be purchased |  |  |  |  |  |  |  | 582,000 |
Agreement period to purchase renewable energy credits |  |  |  |  |  |  | 10 years |  |
Amount billed to customers as surcharges |  |  | $ 835,000 |  | $ 1,200,000 |  |  |  |
Recovery periods |  |  |  |  |  | 12 months |  |  |
Percentage of deferred rate case cost to be borne by shareholders |  |  |  |  |  | 50.00% |  |  |

X
- Definition Represents the amount of retroactive ratemaking proposal included in DRA's recommendation to increase accumulated depreciation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the portion of deferred rate case cost borne by shareholders. + References No definition available. + Details
Name: | awr_PercentageOfDeferredRateCaseCostBorneByShareholders
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the portion of deferred rate case costs required to be written off, if DRA prevails. + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- 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
- 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 amount of provision for loss that has been recorded in the financial statements. + References No definition available. + Details
Name: | awr_RegulatoryAssetProvisionForLoss
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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

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- 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
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