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Summary of Significant Accounting Policies - Schedule of Operating Expenses as Previously Reported and as Reclassified (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
As Reported [Member]
Sep. 30, 2012
As Reported [Member]
Jun. 30, 2012
As Reported [Member]
Mar. 31, 2012
As Reported [Member]
Dec. 31, 2012
As Reclassified [Member]
Sep. 30, 2012
As Reclassified [Member]
Jun. 30, 2012
As Reclassified [Member]
Mar. 31, 2012
As Reclassified [Member]
Costs and expenses:                    
Instructional costs and services $ 59,997 $ 50,824 $ 58,819 $ 57,354 $ 53,406 $ 50,824 $ 58,819 $ 57,354 $ 53,406 $ 50,824
Admissions advisory and related 22,993 19,991             23,215 22,342 20,369 19,991
Advertising 15,929 13,639             13,008 12,909 11,467 13,639
Marketing and promotional 1,435 929             1,313 1,199 919 929
Selling and promotional     37,536 36,450 32,755 34,559            
General and administrative 8,051 7,544 11,696 8,561 7,701 7,544 11,696 8,561 7,701 7,544
Total costs and expenses $ 108,405 $ 92,927 $ 108,051 $ 102,365 $ 93,862 $ 92,927 $ 108,051 $ 102,365 $ 93,862 $ 92,927