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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Regulatory matters:    
Total AWR $ (15,492) $ (22,796)
GSWC    
Regulatory matters:    
Total AWR (15,139) (24,082)
GSWC | Various refunds to customers    
Regulatory matters:    
Total AWR (3,782) (2,680)
GSWC | Water Revenue Adjustment Mechanism and Modified Cost Balancing Account    
Regulatory matters:    
Total AWR 19,530 13,326
GSWC | Costs deferred for future recovery on Aerojet case    
Regulatory matters:    
Total AWR 4,994 5,210
GSWC | Pension and other post-retirement obligations    
Regulatory matters:    
Total AWR 24,975 25,212
GSWC | COVID-19 memorandum accounts    
Regulatory matters:    
Total AWR 4,471 1,663
GSWC | Excess deferred income taxes    
Regulatory matters:    
Total AWR (72,765) (73,000)
GSWC | Flow-through taxes, net    
Regulatory matters:    
Total AWR (5,075) (5,552)
GSWC | Other regulatory assets    
Regulatory matters:    
Total AWR 12,513 11,739
BVESI | Various refunds to customers    
Regulatory matters:    
Total AWR (9,016) (8,189)
BVESI | Other regulatory assets    
Regulatory matters:    
Total AWR 15,683 13,916
BVESI | Derivative unrealized (gain) loss    
Regulatory matters:    
Total AWR $ (7,020) $ (4,441)