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Stockholders' Equity (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 2,982 $ 3,440 $ 5,232 $ 5,830
Tax benefit 1,187 1,359 2,082 2,302
Stock-based compensation expense, net of income tax 1,795 2,081 3,150 3,528
Instruction and educational support [Member]
        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense 844 891 1,941 1,562
Marketing [Member]
        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense            
Admissions advisory [Member]
        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense            
General and administration [Member]
        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 2,138 $ 2,549 $ 3,291 $ 4,268