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Regulatory Matters (Details 5) (GSWC, USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 water_region | Nov. 30, 2014 | Dec. 31, 2013
Regulatory matters: |  |  |
Total | $ 125,704,000 us-gaap_NetRegulatoryAssets |  | $ 122,681,000 us-gaap_NetRegulatoryAssets
Pension Costs and Other Postretirement Benefit Costs [Member] |  |  |
Regulatory matters: |  |  |
Regulatory asset | 40,700,000 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_PensionCostsAndOtherPostretirementBenefitCostsMember |  |
Number of water regions for which two-way balancing account was established | 3 awr_NumberOfWaterRegionsWithBalancingAccount / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_PensionCostsAndOtherPostretirementBenefitCostsMember |  |
Total | 43,426,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_PensionCostsAndOtherPostretirementBenefitCostsMember |  | 20,241,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_PensionCostsAndOtherPostretirementBenefitCostsMember
Pension Costs and Other Postretirement Benefit Costs [Member] | Two-way pension balancing account |  |  |
Regulatory matters: |  |  |
Regulatory asset | 2,700,000 us-gaap_RegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / awr_PensionAndOtherPostRetirementObligationsAxis = awr_UnderCollectionInTwoWayPensionBalancingAccountMember / us-gaap_RegulatoryAssetAxis = awr_PensionCostsAndOtherPostretirementBenefitCostsMember |  |
Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member] |  |  |
Regulatory matters: |  |  |
Commercial paper, term | 90 days |  |
Total | (9,400,000)us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember |  | 16,345,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
Base revenue requirement adjustment mechanism |  |  |
Regulatory matters: |  |  |
Period of surcharge approved | 12 months |  |
Increase in Revenue Requirement, Recoverable through Surcharges |  | 2,300,000 awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember |
Total | 7,761,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember |  | 8,725,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember
Low income rate assistance balancing accounts |  |  |
Regulatory matters: |  |  |
Commercial paper, term | 90 days |  |
Increase in Revenue Requirement, Recoverable through Surcharges | 700,000 awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_LowIncomeRateAssistanceBalancingAccountsMember |  | 1,200,000 awr_IncreaseInRevenueRequirementRecoverableThroughSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_LowIncomeRateAssistanceBalancingAccountsMember
Discount percentage for qualified low-income water customers | 15.00%awr_DiscountPercentageForQualifiedLowIncomeWaterCustomers / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_LowIncomeRateAssistanceBalancingAccountsMember |  |
Discount percentage for qualified low-income electric customers | 20.00%awr_DiscountPercentageForQualifiedLowIncomeElectricCustomers / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_LowIncomeRateAssistanceBalancingAccountsMember |  |
Total | $ 9,109,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_LowIncomeRateAssistanceBalancingAccountsMember |  | $ 9,979,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_LowIncomeRateAssistanceBalancingAccountsMember

X
- Definition Represents the discount percentage for qualified low-income electric customers. + References No definition available. + Details
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- Definition Represents the discount percentage for qualified low-income water customers. + References No definition available. + Details
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Balance Type: | na
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- Definition Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs. + References No definition available. + Details
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- Definition Represents the number of water regions for which two-way balancing account was established. + References No definition available. + Details
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- Definition Represents the period of surcharge approved by CPUC for amounts collected through December 2013 to be applied to 2011. + References No definition available. + Details
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- Details
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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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