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Summary of Significant Accounting Policies (Details) (USD $)	0 Months Ended	12 Months Ended
	May 20, 2013	Dec. 31, 2014 registrant	Dec. 31, 2013	Dec. 31, 2012
Summary of significant accounting policies
Related Party Transaction, Amounts of Transaction		$ 2,700,000us-gaap_RelatedPartyTransactionAmountsOfTransaction	$ 2,600,000us-gaap_RelatedPartyTransactionAmountsOfTransaction	$ 2,400,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
Basis of Presentation:
Number of registrants filing combined report		2awr_NumberOfRegistrantsFilingCombinedReport
Stock split ratio	2us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Impairment of Long-Lived Assets
Impairment of long-lived assets		0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse		416,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Goodwill
Goodwill arose from acquisition of subcontractor's business		1,100,000awr_GoodwillAcquiredInPriorPeriod
Sales and Use Taxes:
Non-income tax assessments accounted on a gross basis		16,722,000us-gaap_TaxesExcludingIncomeAndExciseTaxes	15,865,000us-gaap_TaxesExcludingIncomeAndExciseTaxes	15,381,000us-gaap_TaxesExcludingIncomeAndExciseTaxes
Military Utility Privatization Subsidiaries
Summary of significant accounting policies
Period of Fixed Price Contracts to Maintain Water Systems at Various Military Bases		50 years
GSWC
Related Party Transactions
Balance outstanding		0us-gaap_NotesReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	500,000us-gaap_NotesReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Property and Depreciation
Aggregate composite rate for depreciation (as a percent)		3.20%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	3.40%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	3.70%us-gaap_PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Depreciation on transportation equipment		678,000awr_PublicUtilitiesPropertyPlantAndEquipmentDepreciationOnTransportationEquipment / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	877,000awr_PublicUtilitiesPropertyPlantAndEquipmentDepreciationOnTransportationEquipment / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	1,800,000awr_PublicUtilitiesPropertyPlantAndEquipmentDepreciationOnTransportationEquipment / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Estimated useful lives of utility plant, as authorized by the CPUC
Generation		40 years
Interest
Amount recorded in AFUDC		24,000us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	270,000us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	299,000us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Weighted cost of capital (as a percent)		8.64%awr_WeightedCostOfCapitalPercent / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Alternative-Revenue Programs
Number of months within which expected additional revenue collection is recorded		24 months
Advances for Construction and Contributions in aid of Constructions
Period for refund of advances for construction		40 years
Fair Value of Financial Instruments
Long-term debt-GSWC		417,057,000us-gaap_LongTermDebtFairValue / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Sales and Use Taxes:
Franchise fees billed to customers and recorded as operating revenue		3,700,000us-gaap_CostOfReimbursableExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	3,600,000us-gaap_CostOfReimbursableExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	3,400,000us-gaap_CostOfReimbursableExpense / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Non-income tax assessments accounted on a gross basis		15,221,000us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	14,072,000us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	13,835,000us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | Carrying Amount
Fair Value of Financial Instruments
Long-term debt-GSWC		326,090,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	332,377,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | Fair Value
Fair Value of Financial Instruments
Long-term debt-GSWC			412,590,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | Fair Value | Level 2
Fair Value of Financial Instruments
Long-term debt-GSWC		417,057,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | Minimum
Estimated useful lives of utility plant, as authorized by the CPUC
Source of water supply		30 years
Pumping		25 years
Water treatment		20 years
Transmission and distribution		25 years
Other plant		7 years
GSWC | Maximum
Estimated useful lives of utility plant, as authorized by the CPUC
Source of water supply		50 years
Pumping		40 years
Water treatment		35 years
Transmission and distribution		55 years
Other plant		40 years
GSWC | Purchase, production, distribution and sale of water
Nature of Operations:
Number of customers served		258,000awr_NumberOfCustomers / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember
GSWC | Electric
Nature of Operations:
Number of customers served		24,000awr_NumberOfCustomers / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_ElectricServiceUtilityOperationsMember
American States Utility Services [Member]
Sales and Use Taxes:
Non-income tax assessments accounted on a gross basis		490,000us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember	864,000us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember	717,000us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = awr_AmericanStatesUtilityServicesMember
American States Utility Services [Member] | Military Utility Privatization Subsidiaries
Nature of Operations:
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases		50 years
AWR
Related Party Transactions
Maximum borrowing capacity on line of credit		100,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
AWR | Syndicated Credit Facility
Related Party Transactions
Maximum borrowing capacity on line of credit		100,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = awr_SyndicatedRevolvingCreditFacilityMember
AWR | Promissory note
Related Party Transactions
Maximum borrowing capacity on debt instrument		20,000,000.0awr_DebtInstrumentMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Notes Receivable | AWR | Promissory note
Related Party Transactions
Balance outstanding		$ 0us-gaap_NotesReceivableRelatedPartiesCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_NotesReceivableMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Sales [Member] | GSWC | Purchase, production, distribution and sale of water
Nature of Operations:
Percentage of total revenues		90.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_StatementBusinessSegmentsAxis = awr_WaterServiceUtilityOperationsMember

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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