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Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Income [Abstract]      
Revenues $ 627,434 $ 636,732 $ 511,961
Costs and expenses:      
Instruction and educational support 292,003 269,557 218,551
Marketing 74,293 70,270 54,967
Admissions advisory 26,531 25,277 23,017
General and administration 55,464 55,857 43,072
Income from operations 179,143 215,771 172,354
Investment income 152 1,228 1,408
Interest expense 3,773    
Income before income taxes 175,522 216,999 173,762
Provision for income taxes 69,478 85,739 68,684
Net income $ 106,044 $ 131,260 $ 105,078
Earnings per share:      
Basic $ 8.91 $ 9.78 $ 7.67
Diluted $ 8.88 $ 9.70 $ 7.60
Weighted average shares outstanding:      
Basic 11,906 13,426 13,703
Diluted 11,943 13,535 13,825