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Regulatory Matters (Details 10) (GSWC, Cost of Capital Proceeding for Water Regions) | 12 Months Ended |
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Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2012 | Sep. 30, 2012 | Jul. 31, 2012
GSWC | Cost of Capital Proceeding for Water Regions |  |  |  |  |
Regulatory matters: |  |  |  |  |
Authorized return on equity percentage | 9.43%awr_SettlementAgreementAuthorizedReturnOnEquityPercentage / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostOfCapitalProceedingForWaterRegionsMember |  |  |  | 9.99%awr_SettlementAgreementAuthorizedReturnOnEquityPercentage / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostOfCapitalProceedingForWaterRegionsMember
Period of cost of capital proceedings considered for adjustment of R O E and rate of return on rate base | 3 years |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  | 56.00%us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostOfCapitalProceedingForWaterRegionsMember |  |
Change in average of the Moody's Aa utility bond rate (as a percent) |  | 0.30%awr_PercentageofIncreaseinMoodysRatefromBenchmark / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostOfCapitalProceedingForWaterRegionsMember |  |  |
Decrease in Moody's rate from benchmark (as a percent) |  |  |  | 1.12%awr_PercentageOfDecreaseInMoodysRateFromBenchmark / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostOfCapitalProceedingForWaterRegionsMember |
Proposed authorized ROE under the settlement agreement (as a percent) |  |  |  |  | 9.43%awr_SettlementAgreementProposedAuthorizedReturnOnEquityPercentage / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_CostOfCapitalProceedingForWaterRegionsMember

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- Definition Represents the percentage of decrease in Moody's rate from the benchmark. + References No definition available. + Details
Name: | awr_PercentageOfDecreaseInMoodysRateFromBenchmark
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Increase in Moodys Rate from Benchmark + References No definition available. + Details
Name: | awr_PercentageofIncreaseinMoodysRatefromBenchmark
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of cost of capital proceedings considered for adjusting ROE and rate of return on rate base. + References No definition available. + Details
Name: | awr_PeriodOfCostOfCapitalProceedingsConsideredForAdjustmentOfROEAndRateOfReturnOnRateBase
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 Represents the authorized Return on Equity under the settlement agreement. + References No definition available. + Details
Name: | awr_SettlementAgreementAuthorizedReturnOnEquityPercentage
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the percentage of proposed authorized ROE under the settlement agreement. + References No definition available. + Details
Name: | awr_SettlementAgreementProposedAuthorizedReturnOnEquityPercentage
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration