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Derivative Instruments: (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2012 MW | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Derivative instruments |  |  |  |  |
Regulatory asset not accruing carrying costs |  | $ 74,300,000 |  | $ 74,300,000 |
Purchase power contract |  |  |  |  |
Derivative instruments |  |  |  |  |
Number of broker quotes received in order to determine the fair value of derivative instrument |  |  |  | 1 |
GSWC | Purchase power contract |  |  |  |  |
Derivative instruments |  |  |  |  |
Impact on earnings |  |  |  | 0 |
Number of megawatts of base load energy that the entity will be able to purchase under the new agreement | 12 |  |  |  |
Changes in the fair value of the derivative |  |  |  |  |
Balance, at beginning of the period | (7,611,000) | (1,540,000) | (7,506,000) | (3,060,000) | (7,611,000)
Unrealized gain on purchased power contracts |  | 393,000 | 2,330,000 | 1,913,000 | 2,435,000
Balance, at end of the period |  | (1,147,000) | (5,176,000) | (1,147,000) | (5,176,000)
Memorandum account to track unrealized gains and losses on purchase power contracts |  |  |  |  |
Derivative instruments |  |  |  |  |
Regulatory asset not accruing carrying costs |  | $ 1,100,000 |  | $ 1,100,000 |

X
- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Unrealized Gain (Loss) on Contracts + References No definition available. + Details
Name: | awr_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityUnrealizedGainLossonContracts
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of impact on earnings as result of adjustment in derivative instruments. + References No definition available. + Details
Name: | awr_ImpactOnEarningsResultingFromDerivativeAdjustment
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of megawatts of base load energy that the entity will be able to purchase at a fixed price under the new agreement. + References No definition available. + Details
Name: | awr_NewAgreementNumberofMegawattsofBaseLoadEnergythatEntitywillbeabletoPurchase
Namespace Prefix: | awr_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of broker quotes received in order to determine the fair value of the derivative instrument. + References No definition available. + Details
Name: | awr_NumberOfBrokerQuotesReceivedToDetermineFairValueOfDerivativeInstrument
Namespace Prefix: | awr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. + References No definition available. + Details
Name: | awr_RegulatoryAssetNotAccruingCarryingCosts
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant