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Stockholders' Equity (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense $ 3,440 $ 3,435 $ 5,830 $ 6,328
Tax benefit 1,359 1,357 2,302 2,500
Stock-based compensation expense, net of income tax 2,081 2,078 3,528 3,828
Instruction and educational support [Member]
        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense 891 972 1,562 1,823
Marketing [Member]
        
Schedule of stock-based compensation expense        
Stock-based compensation expense included in operating expense    16    35
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 $ 2,549 $ 2,447 $ 4,268 $ 4,470