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Regulatory Matters (Details 10) (GSWC, Cost of Capital Proceeding for Water Regions) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2012 | Oct. 02, 2012 | Jul. 31, 2012
Regulatory matters: |  |  |  |
Authorized return on equity percentage |  |  | 9.43% | 9.99%
Period of cost of capital proceedings considered for adjustment of R O E and rate of return on rate base | 3 years |  |  |
Difference adjustment in ROE (as a percent) | 50.00% |  |  |
Decrease in Moody's rate from benchmark (as a percent) |  | 1.12% |  |
Decrease in ROE (as a percent) | 0.56% |  |  |
Proposed authorized ROE under the settlement agreement (as a percent) |  |  |  | 9.43%
Minimum |  |  |  |
Regulatory matters: |  |  |  |
Change in average of the Moody's Aa utility bond rate (as a percent) | 1.00% |  |  |

X
- Definition Represents the positive or negative change in the average of the Moody's Aa utility bond rate. + References No definition available. + Details
Name: | awr_ChangeInAverageMoodysRateAboveBenchmark
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of difference adjusted in ROE, when there is a change in average Moody's rate from the benchmark. + References No definition available. + Details
Name: | awr_DifferencePercentageAdjustmentInROEWhenAverageMoodysRateChangesFromBenchmark
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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 Represents the percentage of decrease in ROE. + References No definition available. + Details
Name: | awr_PercentageOfDecreaseInROE
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