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Utility Plant and Intangible Assets (Details 2) (USD $)

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Intangible assets

Property, Plant and Equipment, Gross

$ 1,455,416,000us-gaap_PropertyPlantAndEquipmentGross

$ 1,395,959,000us-gaap_PropertyPlantAndEquipmentGross

Total amortized intangible assets

35,468,000us-gaap_FiniteLivedIntangibleAssetsGross

35,405,000us-gaap_FiniteLivedIntangibleAssetsGross

Less - accumulated amortization

(24,456,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization

(22,530,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization

Intangible assets, net of amortization

11,012,000us-gaap_FiniteLivedIntangibleAssetsNet

12,875,000us-gaap_FiniteLivedIntangibleAssetsNet

Unamortized intangible assets

427,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill

^[1]

427,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill

^[1]

Amortization of intangible assets

1,900,000us-gaap_AmortizationOfIntangibleAssets

1,900,000us-gaap_AmortizationOfIntangibleAssets

2,400,000us-gaap_AmortizationOfIntangibleAssets

Estimated future consolidated amortization expenses related to intangible assets

2014

2,441,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

2015

1,605,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

2016

1,491,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

2017

1,491,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

2018

1,320,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

Total

8,348,000awr_FiniteLivedIntangibleAssetsEstimatedFutureAmortizationExpense

Conservation

Intangible assets

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

26 years

Total amortized intangible assets

9,496,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_ConservationMember

9,496,000us-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

8,695,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_WaterAndWaterServiceRightsMember

^[2]

8,695,000us-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

17,277,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_WaterPlanningStudiesMember

17,214,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_WaterPlanningStudiesMember

GSWC

Intangible assets

Property, Plant and Equipment, Gross

1,444,710,000us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

1,386,869,000us-gaap_PropertyPlantAndEquipmentGross
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

Total amortized intangible assets

34,897,000us-gaap_FiniteLivedIntangibleAssetsGross
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

34,834,000us-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

10,524,000us-gaap_FiniteLivedIntangibleAssetsNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

12,375,000us-gaap_FiniteLivedIntangibleAssetsNet
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

Unamortized intangible assets

409,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

^[1]

409,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

^[1]

GSWC | Conservation

Intangible assets

Total amortized intangible assets

9,496,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_ConservationMember
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

9,496,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_ConservationMember
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

GSWC | Water and water service rights

Intangible assets

Total amortized intangible assets

8,124,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_WaterAndWaterServiceRightsMember
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

^[2]

8,124,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_WaterAndWaterServiceRightsMember
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

^[2]

GSWC | Water planning studies

Intangible assets

Total amortized intangible assets

17,277,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= awr_WaterPlanningStudiesMember
/ dei_LegalEntityAxis
= awr_GoldenStateWaterCompanyMember

17,214,000us-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

$ 600,000us-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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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

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