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Military Privatization (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Receivables from the U.S. government:        
Less: allowance for doubtful accounts $ (3,569) $ (5,316) $ (916) $ (951)
Pretax income        
Increase in pretax operating income $ 140,977 130,499 127,073  
Contracted services:        
Military Privatization        
Period of fixed price contracts to maintain water systems at various military bases 50 years      
Number of Operating Segments 8      
American States Utility Services | Contracted services:        
Pretax income        
Increase in pretax operating income $ 22,675 $ 22,309 $ 21,990