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Utility Plant and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	$ 1,455,416us-gaap_PropertyPlantAndEquipmentGross		$ 1,395,959us-gaap_PropertyPlantAndEquipmentGross
Less - accumulated depreciation	(500,239)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation		(471,665)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Construction work in progress	48,343us-gaap_ConstructionInProgressGross		57,183us-gaap_ConstructionInProgressGross
Net utility plant	1,003,520us-gaap_PropertyPlantAndEquipmentNet		981,477us-gaap_PropertyPlantAndEquipmentNet		917,791us-gaap_PropertyPlantAndEquipmentNet
Water
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	1,373,780us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		1,316,599us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Water | Land
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	15,423us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_LandMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		15,423us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_LandMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Water | Intangible Assets [Member]
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	34,081us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		34,019us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Water | Source of water supply
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	80,614us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_SourceOfWaterSupplyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		75,651us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_SourceOfWaterSupplyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Water | Pumping
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	155,802us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterPumpingEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		147,390us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterPumpingEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Water | Water treatment
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	71,519us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterTreatmentEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		70,947us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterTreatmentEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Water | Transmission and distribution
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	894,789us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		856,823us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Water | General
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	121,552us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		116,346us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Electric
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	81,636us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		79,360us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
Electric | Intangible Assets [Member]
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	1,200us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		1,200us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
Electric | Transmission and distribution
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	60,035us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_ElectricTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		58,400us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_ElectricTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
Electric | Generation
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	12,547us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_ElectricGenerationEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		12,547us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_ElectricGenerationEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
Electric | General
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	9,054us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_ElectricPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember	[1]	8,413us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_ElectricPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember	[1]
GSWC
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	1,444,710us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember		1,386,869us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Less - accumulated depreciation	(494,000)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember		(466,329)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Construction work in progress	48,170us-gaap_ConstructionInProgressGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember		56,754us-gaap_ConstructionInProgressGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Net utility plant	998,880us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember		977,294us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | Water
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	1,363,074us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		1,307,509us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
Net utility plant	953,678us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		936,386us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		871,756us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Water | Land
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	15,423us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_LandMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		15,423us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_LandMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Water | Intangible Assets [Member]
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	34,063us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		34,001us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Water | Source of water supply
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	80,614us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_SourceOfWaterSupplyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		75,651us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_SourceOfWaterSupplyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Water | Pumping
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	155,802us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterPumpingEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		147,390us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterPumpingEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Water | Water treatment
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	71,519us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterTreatmentEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		70,947us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterTreatmentEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Water | Transmission and distribution
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	894,789us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		856,823us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Water | General
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	110,864us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember		107,274us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Electric
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	81,636us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		79,360us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
Net utility plant	45,202us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		40,908us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		41,381us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
GSWC | Electric | Transmission and distribution
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	60,035us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_ElectricTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		58,400us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_ElectricTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
GSWC | Electric | Generation
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	12,547us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_ElectricGenerationEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember		12,547us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_ElectricGenerationEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
GSWC | Electric | General
Utility plant utilized in continuing operations by major asset class
Total utility plant, at cost	$ 9,054us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_ElectricPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember	[1]	$ 8,413us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_ElectricPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember	[1]
[1] Includes intangible assets of $1.2 million for the years ended December 31, 2014 and 2013 for studies performed in association with the electricity segment of the Registrant’s operations.

X

- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

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-Publisher SEC

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-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

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-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility.

+ References

No definition available.

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