v3.26.1
Business Segments - Schedule of PPE and Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Details of reportable segment    
Total net property, plant and equipment (4) $ 2,329,693 $ 2,296,319
Other assets 404,447 418,773
Total Assets 2,734,140 2,715,092
Reportable Legal Entities    
Details of reportable segment    
Total net property, plant and equipment (4) 2,329,693 2,296,319
Other assets 402,401 420,543
Total Assets 2,732,094 2,716,862
Intersegment Eliminations    
Details of reportable segment    
Total net property, plant and equipment (4) 0 0
Other assets (1,178,523) (1,178,530)
Total Assets (1,178,523) (1,178,530)
AWR | Intersegment Eliminations    
Details of reportable segment    
Total net property, plant and equipment (4) 0 0
Other assets 1,180,569 1,176,760
Total Assets 1,180,569 1,176,760
GOLDEN STATE WATER COMPANY    
Details of reportable segment    
Total net property, plant and equipment (4) 2,114,302 2,083,684
Total Assets 2,334,310 2,315,862
GOLDEN STATE WATER COMPANY | Reportable Legal Entities | Water:    
Details of reportable segment    
Total net property, plant and equipment (4) 2,114,302 2,083,684
Other assets 220,008 232,178
Total Assets 2,334,310 2,315,862
BVES | Reportable Legal Entities | Electric:    
Details of reportable segment    
Total net property, plant and equipment (4) 194,252 192,416
Other assets 58,765 61,928
Total Assets 253,017 254,344
ASUS | Reportable Legal Entities | Contracted services:    
Details of reportable segment    
Total net property, plant and equipment (4) 21,139 20,219
Other assets 123,628 126,437
Total Assets $ 144,767 $ 146,656