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Business Segments - Schedule of Reconciling Property Plant and Equipment to Consolidated Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total utility plant | $ 2,099,625 | $ 1,892,280
Other assets | 400,584 | 353,842
Total Assets | 2,500,209 | 2,246,122
AWR |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total Assets | 1,045,732 | 922,901
GSWC |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total utility plant | 1,911,369 | 1,735,534
Total Assets | 2,131,981 | 1,916,155
Reportable Legal Entities |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total utility plant | 2,099,625 | 1,892,280
Other assets | 396,939 | 349,725
Total Assets | 2,496,564 | 2,242,005
Reportable Legal Entities | Water | GSWC |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total utility plant | 1,911,369 | 1,735,534
Other assets | 220,612 | 180,621
Total Assets | 2,131,981 | 1,916,155
Reportable Legal Entities | Electric | BVES |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total utility plant | 170,349 | 140,279
Other assets | 50,048 | 35,241
Total Assets | 220,397 | 175,520
Reportable Legal Entities | Contracted services: | American States Utility Services |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total utility plant | 17,907 | 16,467
Other assets | 126,279 | 133,863
Total Assets | 144,186 | 150,330
Intersegment Eliminations |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total utility plant | 0 | 0
Other assets | (1,042,087) | (918,784)
Total Assets | (1,042,087) | (918,784)
Intersegment Eliminations | AWR |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total utility plant | 0 | 0
Other assets | 1,045,732 | 922,901
Total Assets | $ 1,045,732 | $ 922,901

X
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