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v2.4.1.9

Contingencies: (Details) (GSWC, USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 customer | Nov. 04, 2014
Environmental Clean-Up and Remediation |  |
Contingencies |  |
Amount spent in clean-up and remediation activities | 4.6 us-gaap_EnvironmentalRemediationExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities | 1.5 awr_EnvironmentalLossContingenciesPaidByThirdParty / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |
Accrued liability for the estimated additional cost to complete the clean-up at the site | 1.4 us-gaap_AccrualForEnvironmentalLossContingencies / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_EnvironmentalIssueMember |
City of Claremont | Condemnation of Properties |  |
Contingencies |  |
Condemnation |  | 135 awr_Potentialamountofcitybondstobeissued / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityOfClaremontMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember
Number of customers served through water systems | 11,000 awr_LossContingencyNumberOfCustomersServed / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityOfClaremontMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember |
Ojai FLOW | Condemnation of Properties |  |
Contingencies |  |
Number of customers served through water systems | 3,000 awr_LossContingencyNumberOfCustomersServed / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_OjaiFLOWMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember |
City of Apple Valley | Condemnation of Properties |  |
Contingencies |  |
Number of customers served through water systems | 2,900 awr_LossContingencyNumberOfCustomersServed / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityofAppleValleyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember |
City of Artesia | Condemnation of Properties |  |
Contingencies |  |
Number of customers served through water systems | 3,300 awr_LossContingencyNumberOfCustomersServed / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityofArtesiaMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember |
Independent Transmission and Distribution System | City of Claremont | Condemnation of Properties |  |
Contingencies |  |
Public Utilities, Property, Plant and Equipment, Net | 47.4 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_LitigationCaseAxis = awr_CityOfClaremontMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = awr_CondemnationOfPropertiesMember / us-gaap_PublicUtilityAxis = us-gaap_IndependentTransmissionAndDistributionSystemMember |

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