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Commitments (Details 3) (GSWC, USD $) | 12 Months Ended | 36 Months Ended | 59 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 MW | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 | Nov. 30, 2013
Water Purchase Commitments [Member] |  |  |  |  |
Purchase commitments |  |  |  |  |
Optional renewal term | 10 years |  |  |  |
Total commitment under agreement | $ 5,626,000 |  |  |  |
Bear Valley Electric |  |  |  |  |
Purchase commitments |  |  |  |  |
Average load at customer service area (in MWs) | 11 |  |  |  |
Average winter load (in MWs) | 20 |  |  |  |
Winter peak load (in MWs) | 45 |  |  |  |
Maximum capacity fo natural gas-fuled generation facility (in megawatts) | 8.4 |  |  |  |
Bear Valley Electric | Shell |  |  |  |  |
Purchase commitments |  |  |  |  |
Megawatts of electric energy provided under contract | 13 |  |  |  |
Fixed price of electric energy per MWh |  |  |  | 66.40 | 67.15
Purchase of power under the shell contract | $ 7,100,000 | $ 7,800,000 | $ 9,000,000 |  |
Bear Valley Electric | EDF |  |  |  |  |
Purchase commitments |  |  |  |  |
Megawatts of electric energy provided under contract | 12 |  |  |  |

X
- Definition Represents the average load at customer service area. + References No definition available. + Details
Name: | awr_AverageLoadAtCustomerServiceAreaNumberOfMegawatts
Namespace Prefix: | awr_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the average winter load. + References No definition available. + Details
Name: | awr_AverageWinterLoadNumberOfMegawatts
Namespace Prefix: | awr_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the fixed price of electric energy per megawatt-hour. + References No definition available. + Details
Name: | awr_FixedPriceOfElectricEnergyPerMegawatthour
Namespace Prefix: | awr_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the megawatts of electric energy provided under purchased power contract. + References No definition available. + Details
Name: | awr_MegawattsofElectricEnergyProvidedunderPurchasedPowerContract
Namespace Prefix: | awr_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum capacity provided by a natural gas-fueled generation facility. + References No definition available. + Details
Name: | awr_NaturalGasFueledGenerationFacilityMaximumCapacity
Namespace Prefix: | awr_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the agreement renewal term under exercise option. + References No definition available. + Details
Name: | awr_PurchaseObligationRenewalCommitmentTerm
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of electric power purchased during the period under the shell contract. + References No definition available. + Details
Name: | awr_PurchaseOfElectricPowerUnderShellContract
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the winter peak load when the snowmaking machines at the ski resorts are operating. + References No definition available. + Details
Name: | awr_WinterPeakLoadNumberOfMegawatts
Namespace Prefix: | awr_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant