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Regulatory Matters: Alternative-Revenue Programs (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
WRAM, net of MCBA |  |  |
Regulatory matters: |  |  |
Increase (decrease) in other regulatory assets | $ 8,000,000 us-gaap_IncreaseDecreaseInOtherRegulatoryAssets / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember | $ 3,600,000 us-gaap_IncreaseDecreaseInOtherRegulatoryAssets / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember |
GOLDEN STATE WATER COMPANY |  |  |
Regulatory matters: |  |  |
Under (over) collection | 131,921,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  | 125,704,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA |  |  |
Regulatory matters: |  |  |
Commercial paper, term | 90 days |  |
Amount billed to customers as surcharges | 600,000 awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember | 1,800,000 awr_RegulatoryAssetAmountBilledToCustomersAsSurcharges / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember |
Under (over) collection | 17,948,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember |  | 9,369,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismNetOfModifiedCostBalancingAccountMember
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA | Minimum |  |  |
Regulatory matters: |  |  |
Regulatory asset recovery periods | 18 months |  |
GOLDEN STATE WATER COMPANY | WRAM, net of MCBA | Maximum |  |  |
Regulatory matters: |  |  |
Regulatory asset recovery periods | 24 months |  |
GOLDEN STATE WATER COMPANY | WRAM |  |  |
Regulatory matters: |  |  |
Under (over) collection | 13,700,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_WaterRevenueAdjustmentMechanismMember |  |
GOLDEN STATE WATER COMPANY | Modified Cost Balancing Account |  |  |
Regulatory matters: |  |  |
Under (over) collection | 4,200,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_ModifiedCostBalancingAccountMember |  |
GOLDEN STATE WATER COMPANY | Base revenue requirement adjustment mechanism |  |  |
Regulatory matters: |  |  |
Under (over) collection | 6,452,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember |  | 7,761,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember
Customer surcharges expected to be collected | $ 3,100,000 awr_RegulatoryAssetCustomerSurchargesExpectedtobeCollected / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_BaseRevenueRequirementAdjustmentMechanismMember |  |

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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=56944662&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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