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Regulatory Matters: (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | $ (28,200) |
Regulatory assets | (19,867) | $ (16,539)
Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | (63,200) |
Deferred Income Tax Charge |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | (77,400) |
Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | (7,200) |
Derivative unrealized (gain) loss |  |
Regulatory matters: |  |
Regulatory asset not accruing carrying costs | (7,900) |
Bear Valley Electric Service, Inc. |  |
Regulatory matters: |  |
Regulatory asset-Wildfire mitigation Plans (WMP) | 2,200 |
Regulatory asset CEMA - Storm | 455 |
Bear Valley Electric Service, Inc. | Other Regulatory Assets Net [Member] |  |
Regulatory matters: |  |
Regulatory assets | (4,101) | (2,629)
Bear Valley Electric Service, Inc. | Derivative unrealized (gain) loss |  |
Regulatory matters: |  |
Regulatory assets | 7,875 | (1,537)
Golden State Water Company |  |
Regulatory matters: |  |
Regulatory assets | (23,641) | (12,373)
Golden State Water Company | Revenue Subject to Refund [Member] |  |
Regulatory matters: |  |
Regulatory assets | 3,929 | 4,577
Golden State Water Company | Costs deferred for future recovery on Aerojet case |  |
Regulatory matters: |  |
Regulatory assets | (5,557) | (6,751)
Golden State Water Company | Pension and other post-retirement obligations |  |
Regulatory matters: |  |
Regulatory assets | (63,149) | (65,576)
Golden State Water Company | Catastrophic Event Memo Account (CEMA) [Member] |  |
Regulatory matters: |  |
Regulatory assets | (7,912) | (4,119)
Golden State Water Company | Deferred Income Tax Charge |  |
Regulatory matters: |  |
Regulatory assets | 73,409 | 74,185
Golden State Water Company | Flow-through taxes, net |  |
Regulatory matters: |  |
Regulatory assets | 6,620 | 9,722
Golden State Water Company | Other Regulatory Assets Net [Member] |  |
Regulatory matters: |  |
Regulatory assets | (11,372) | (10,670)
Golden State Water Company | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account |  |
Regulatory matters: |  |
Regulatory assets | (19,609) | $ (13,741)
Golden State Water Company | Water Revenue Adjustment Mechanism [Member] |  |
Regulatory matters: |  |
Regulatory assets | (3,400) |
Golden State Water Company and Bear Valley Electric Service Inc. |  |
Regulatory matters: |  |
Regulatory asset-CEMA | $ 8,500 |

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- Definition Regulatory asset-Catastrophic Event Memo Account (CEMA) + References No definition available. + Details
Name: | awr_RegulatoryAssetCEMA
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Regulatory asset CEMA - Storm + References No definition available. + Details
Name: | awr_RegulatoryAssetCEMAStorm
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the regulatory asset not accruing carrying costs as of the balance sheet date. + References No definition available. + Details
Name: | awr_RegulatoryAssetNotAccruingCarryingCosts
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Regulatory asset-Wildfire mitigation Plans ( WMP) + References No definition available. + Details
Name: | awr_RegulatoryAssetWildfireMitigationPlansWMP
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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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_OtherRegulatoryAssetsNetMember
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: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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