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Military Privatization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Military Privatization        
Billings in excess of costs and estimated earnings on contracts $ 3,764 $ 11,736    
Receivables from the U.S. government:        
Less: allowance for doubtful accounts (944) (892) $ (1,187) $ (1,228)
Pretax income        
Increase in pretax operating income $ 118,489 119,045 119,072  
Military Utility Privatization Subsidiaries        
Military Privatization        
Period of fixed price contracts to maintain water systems at various military bases 50 years      
Initial contract period 2 years      
Price redetermination interval 3 years      
Revenues recognized net of billings to date        
Revenues (costs and estimated earnings) recognized on uncompleted contracts $ 111,397 94,654    
Less: Billings to date (61,662) (56,114)    
Total 49,735 38,540    
Amount included in accompanying balance sheets        
Costs and estimated earnings in excess of billings on uncompleted contracts 53,499 50,276    
Billings in excess of costs and estimated earnings on uncompleted contracts (3,764) (11,736)    
Total 49,735 38,540    
Receivables from the U.S. government:        
Billed receivables from the U.S. government 5,861 6,709    
Unbilled Contract Receivables, Current 1,309 3,689    
Less: allowance for doubtful accounts 0 0    
Pretax income        
Government Contract Receivable 7,170 10,398    
American States Utility Services [Member] | Military Utility Privatization Subsidiaries        
Pretax income        
Increase in pretax operating income 18,091 19,351 $ 16,737  
Reportable Legal Entities [Member] | American States Utility Services [Member] | Military Utility Privatization Subsidiaries        
Military Privatization        
Revenue Recognition, Retrospective Rate-Setting Systems, Amount $ 3,000 $ 1,700