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Regulatory Matters (Details 2) (USD $) | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Apr. 30, 2012 | Nov. 30, 2014 | Dec. 31, 2013
WRAM |  |  |  |
Regulatory matters: |  |  |  |
Over collection | $ 7,400,000 us-gaap_IncreaseDecreaseInOtherRegulatoryAssets / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismMember |  |  |
GSWC |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection | 125,704,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |  | 122,681,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | WRAM, net of MCBA |  |  |  |
Regulatory matters: |  |  |  |
Commercial paper, term | 90 days |  |  |
Amount billed to customers as surcharges | 14,300,000 awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember |  |  |
Under (over) collection | (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
Under-collection balances as a percentage of adopted annual revenues |  | 15.00%awr_UnderCollectionBalancesAsPercentageOfAdoptedAnnualRevenues / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember |  |
Annual surcharges as a percentage of the last authorized revenue requirement |  | 10.00%awr_AnnualSurchargesAsPercentageOfLastAuthorizedRevenueRequirement / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember |  |
GSWC | WRAM, net of MCBA | Minimum |  |  |  |
Regulatory matters: |  |  |  |
Recovery period for under-collection balances greater than 15% of adopted annual revenues |  | 19 months |  |
GSWC | WRAM, net of MCBA | Maximum |  |  |  |
Regulatory matters: |  |  |  |
Alternative revenue program | 24 months |  |  |
Recovery period for under-collection balances that are up to 15% of adopted annual revenues |  | 36 months |  |
Recovery period for under-collection balances greater than 15% of adopted annual revenues | 18 months |  |  |
GSWC | WRAM |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection | 10,500,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismMember |  |  |
GSWC | Modified Cost Balancing Account |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection | 1,100,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_ModifiedCostBalancingAccountMember |  |  |
GSWC | Base revenue requirement adjustment mechanism |  |  |  |
Regulatory matters: |  |  |  |
Under (over) collection | 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
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 |
GSWC | Base revenue requirement adjustment mechanism | Maximum |  |  |  |
Regulatory matters: |  |  |  |
Alternative revenue program |  |  | 24 months |

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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 amount billed to customers as surcharges. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + 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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