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Military Privatization (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Receivables from the U.S. government:        
Less: allowance for doubtful accounts $ (1,187) $ (1,228) $ (1,048) $ (1,051)
Pretax income        
Increase in pretax operating income 119,072 111,094 95,104 [1]  
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 78,741 62,902    
Less: Billings to date (32,262) (37,335)    
Total 46,479 25,567    
Amount included in accompanying balance sheets        
Costs and estimated earnings in excess of billings on uncompleted contracts 53,331 38,139    
Billings in excess of costs and estimated earnings on uncompleted contracts (6,852) (12,572)    
Total 46,479 25,567    
Receivables from the U.S. government:        
Billed receivables from the U.S. government 7,106 12,913    
Unbilled receivables from the U.S. government 3,104 4,535    
Less: allowance for doubtful accounts 0 (8)    
Total 10,210 17,440    
Pretax income        
Increase in pretax operating income $ 24,608 $ 11,855    
[1] (2) Operating income (loss) includes CCWC’s allocated corporate overhead costs that are now primarily at GSWC.