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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of operating expenses, reported and reclassified on consolidated statements of income      
Instruction and educational support $ 300,098 $ 292,003 $ 269,557
Marketing 71,864 74,293 70,270
Admissions advisory 26,374 26,531 25,277
General and administration 50,056 55,464 55,857
As Reported [Member]
      
Schedule of operating expenses, reported and reclassified on consolidated statements of income      
Instruction and educational support     205,212
Marketing     114,164
Admissions advisory       
General and administration     101,585
Operating expenses     420,961
As Reclassified [Member]
      
Schedule of operating expenses, reported and reclassified on consolidated statements of income      
Instruction and educational support     269,557
Marketing     70,270
Admissions advisory     25,277
General and administration     55,857
Operating expenses     $ 420,961