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Financial Statement Presentation - Schedule of Operating Expenses as Previously Reported and as Reclassified (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Costs and expenses:                      
Instructional costs and services $ 67,971 $ 64,704 $ 61,747 $ 59,997 $ 58,819 $ 57,354 $ 53,406 $ 50,824 $ 254,419 $ 220,403 $ 194,801
Admissions advisory and related 26,160 24,578 23,346 22,993 23,215 22,342 20,369 19,991 97,077 85,917 70,758
Advertising 15,038 15,498 14,520 15,929 13,008 12,909 11,467 13,639 60,985 51,023 45,587
Marketing and promotional                 5,644 4,360 3,610
Selling and promotional 1,527 1,299 1,383 1,435 1,313 1,199 919 929        
General and administrative 10,870 9,035 8,978 8,051 11,696 8,561 7,701 7,544 36,934 35,502 29,043
Lease termination costs                      782
Total costs and expenses 121,566 115,114 109,974 108,405 108,051 102,365 93,862 92,927 455,059 397,205 344,581
As Reported [Member]
                      
Costs and expenses:                      
Instructional costs and services                   220,403 194,801
Admissions advisory and related                        
Advertising                        
Marketing and promotional                        
Selling and promotional                   141,300 119,955
General and administrative                   35,502 29,043
Lease termination costs                      782
Total costs and expenses                   $ 397,205 $ 344,581