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Military Privatization (Details) - Contracted services: | 12 Months Ended
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Dec. 31, 2022
Military Privatization |
Period of fixed price contracts to maintain water systems at various military bases | 50 years
Number of Operating Segments | 8

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- Definition Number of bases served with EPAs approved + References No definition available. + Details
Name: | awr_NumberofbasesservedwithEPAsapproved
Namespace Prefix: | awr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases. + References No definition available. + Details
Name: | awr_PeriodOfFixedPriceContractsToMaintainWaterSystemsAtVariousMilitaryBases
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=awr_ContractedServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |