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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
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Utility plant utilized in continuing operations by major asset class |  |  |  |  |
Total utility plant, at cost | $ 1,455,416 us-gaap_PropertyPlantAndEquipmentGross |  | $ 1,395,959 us-gaap_PropertyPlantAndEquipmentGross |  |
Less - accumulated depreciation | (500,239)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation |  | (471,665)us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation |  |
Construction work in progress | 48,343 us-gaap_ConstructionInProgressGross |  | 57,183 us-gaap_ConstructionInProgressGross |  |
Net utility plant | 1,003,520 us-gaap_PropertyPlantAndEquipmentNet |  | 981,477 us-gaap_PropertyPlantAndEquipmentNet |  | 917,791 us-gaap_PropertyPlantAndEquipmentNet
Water |  |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |  |
Total utility plant, at cost | 1,373,780 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 1,316,599 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  |
Water | Land |  |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |  |
Total utility plant, at cost | 15,423 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_LandMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 15,423 us-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 | 34,081 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 34,019 us-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 | 80,614 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_SourceOfWaterSupplyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 75,651 us-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 | 155,802 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterPumpingEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 147,390 us-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 | 71,519 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterTreatmentEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 70,947 us-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 | 894,789 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 856,823 us-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 | 121,552 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_WaterPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 116,346 us-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 | 81,636 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 79,360 us-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 | 1,200 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 1,200 us-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 | 60,035 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_ElectricTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 58,400 us-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 | 12,547 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = us-gaap_ElectricGenerationEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 12,547 us-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 | 9,054 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PublicUtilityAxis = awr_ElectricPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember | [1] | 8,413 us-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 | 1,444,710 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 1,386,869 us-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 | 48,170 us-gaap_ConstructionInProgressGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 56,754 us-gaap_ConstructionInProgressGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
Net utility plant | 998,880 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 977,294 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |
GSWC | Water |  |  |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |  |  |
Total utility plant, at cost | 1,363,074 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 1,307,509 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  |
Net utility plant | 953,678 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 936,386 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 871,756 us-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 | 15,423 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_LandMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 15,423 us-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 | 34,063 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_IntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 34,001 us-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 | 80,614 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_SourceOfWaterSupplyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 75,651 us-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 | 155,802 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterPumpingEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 147,390 us-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 | 71,519 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterTreatmentEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 70,947 us-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 | 894,789 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 856,823 us-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 | 110,864 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_WaterPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember |  | 107,274 us-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 | 81,636 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 79,360 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  |
Net utility plant | 45,202 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 40,908 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 41,381 us-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 | 60,035 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_ElectricTransmissionAndDistributionMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 58,400 us-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 | 12,547 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = us-gaap_ElectricGenerationEquipmentMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember |  | 12,547 us-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 | $ 9,054 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_PublicUtilityAxis = awr_ElectricPlantGeneralMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember | [1] | $ 8,413 us-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.

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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