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Utility Plant and Intangible Assets (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Intangible assets |  |  |  |  |
Property, Plant and Equipment, Gross | $ 1,455,416,000 us-gaap_PropertyPlantAndEquipmentGross |  | $ 1,395,959,000 us-gaap_PropertyPlantAndEquipmentGross |  |
Total amortized intangible assets | 35,468,000 us-gaap_FiniteLivedIntangibleAssetsGross |  | 35,405,000 us-gaap_FiniteLivedIntangibleAssetsGross |  |
Less - accumulated amortization | (24,456,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (22,530,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |
Intangible assets, net of amortization | 11,012,000 us-gaap_FiniteLivedIntangibleAssetsNet |  | 12,875,000 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Unamortized intangible assets | 427,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | [1] | 427,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | [1] |
Amortization of intangible assets | 1,900,000 us-gaap_AmortizationOfIntangibleAssets |  | 1,900,000 us-gaap_AmortizationOfIntangibleAssets |  | 2,400,000 us-gaap_AmortizationOfIntangibleAssets
Estimated future consolidated amortization expenses related to intangible assets |  |  |  |  |
2014 | 2,441,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |
2015 | 1,605,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |
2016 | 1,491,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |
2017 | 1,491,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |
2018 | 1,320,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |
Total | 8,348,000 awr_FiniteLivedIntangibleAssetsEstimatedFutureAmortizationExpense |  |  |  |
Conservation |  |  |  |  |
Intangible assets |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 26 years |  |  |  |
Total amortized intangible assets | 9,496,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_ConservationMember |  | 9,496,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_ConservationMember |  |
Water and water service rights |  |  |  |  |
Intangible assets |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 30 years |  |  |  |
Total amortized intangible assets | 8,695,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_WaterAndWaterServiceRightsMember | [2] | 8,695,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_WaterAndWaterServiceRightsMember | [2] |
Water planning studies |  |  |  |  |
Intangible assets |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 13 years |  |  |  |
Total amortized intangible assets | 17,277,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_WaterPlanningStudiesMember |  | 17,214,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_WaterPlanningStudiesMember |  |
GSWC |  |  |  |  |
Intangible assets |  |  |  |  |
Property, Plant and Equipment, Gross | 1,444,710,000 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 1,386,869,000 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
Total amortized intangible assets | 34,897,000 us-gaap_FiniteLivedIntangibleAssetsGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 34,834,000 us-gaap_FiniteLivedIntangibleAssetsGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
Less - accumulated amortization | (24,373,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | (22,459,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
Intangible assets, net of amortization | 10,524,000 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 12,375,000 us-gaap_FiniteLivedIntangibleAssetsNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
Unamortized intangible assets | 409,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | [1] | 409,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | [1] |
GSWC | Conservation |  |  |  |  |
Intangible assets |  |  |  |  |
Total amortized intangible assets | 9,496,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_ConservationMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 9,496,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_ConservationMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
GSWC | Water and water service rights |  |  |  |  |
Intangible assets |  |  |  |  |
Total amortized intangible assets | 8,124,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_WaterAndWaterServiceRightsMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | [2] | 8,124,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_WaterAndWaterServiceRightsMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember | [2] |
GSWC | Water planning studies |  |  |  |  |
Intangible assets |  |  |  |  |
Total amortized intangible assets | 17,277,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_WaterPlanningStudiesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 17,214,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = awr_WaterPlanningStudiesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
Intangible Assets [Member] | American States Utility Services [Member] |  |  |  |  |
Intangible assets |  |  |  |  |
Property, Plant and Equipment, Gross | $ 600,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_AmericanStatesUtilityServicesMember |  |  |  |
[1] | The intangible assets not subject to amortization primarily consist of organization and consent fees.
[2] | Includes intangible assets of $571,000 for contracted services included in "Other Property and Investments" on the consolidated balance sheets as of December 31, 2014 and 2013.

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