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v3.20.4

Regulatory Matters 6 (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) unit | Dec. 31, 2019 USD ($)
Regulatory matters: |  |
Net regulatory assets | $ 16,539 | $ (2,450)
Bear Valley Electric Service, Inc. |  |
Regulatory matters: |  |
Number of renewable energy credits that would be purchased | unit | 578,000 |
Bear Valley Electric Service, Inc. | Renewables Portfolio Standard [Member] |  |
Regulatory matters: |  |
Derivative, Term of Contract | ten |
GSWC |  |
Regulatory matters: |  |
Net regulatory assets | $ 12,373 | (2,450)
Various refunds to customers | GSWC |  |
Regulatory matters: |  |
Net regulatory assets | $ (4,577) | $ (8,478)

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- Definition Represents the period of agreement with a third party to purchase renewable energy credits. + References No definition available. + Details
Name: | awr_PeriodofAgreementforPurchaseofRenewableEnergyCredits
Namespace Prefix: | awr_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of renewable energy credits that would be purchased over a contractual period of time. + References No definition available. + Details
Name: | awr_PurchasedRenewableEnergyCreditsNumber
Namespace Prefix: | awr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | awr_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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://fasb.org/us-gaap/role/ref/legacyRef -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
Name: | us-gaap_NetRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=awr_BearValleyElectricServiceIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_RenewablesPortfolioStandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_RevenueSubjectToRefundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |