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Stockholders' Equity (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 3,527 $ 3,470 $ 9,358 $ 9,798
Tax benefit 1,393 1,371 3,696 3,870
Stock-based compensation expense, net of income tax 2,134 2,099 5,662 5,928
Instruction and educational support [Member]
        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense 976 904 2,538 2,728
Marketing [Member]
        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense    16    51
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 $ 2,551 $ 2,550 $ 6,820 $ 7,019