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Business Segments - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 USD ($) segment item | Mar. 31, 2022 USD ($) | Dec. 31, 2022 USD ($)
GSWC |  |  |
Details of reportable segment |  |  |
Number of reportable segments | item | 1 |  |
Golden State Water Company and Bear Valley Electric Service Inc. |  |  |
Details of reportable segment |  |  |
Public Utilities Property Plant and Equipment Depreciation on Transportation Equipment | $ | $ 368 | $ 94 | $ 212
Parent Company |  |  |
Details of reportable segment |  |  |
Number of reportable segments | segment | 3 |  |

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of transportation equipment over the assets' useful lives. + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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Period Type: | duration

X
- 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
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |