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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
CTU [Member]
Dec. 31, 2012
CTU [Member]
Dec. 31, 2012
AIU [Member]
Dec. 31, 2011
AIU [Member]
Dec. 31, 2010
AIU [Member]
Jun. 30, 2012
Health Education [Member]
Dec. 31, 2012
Health Education [Member]
Dec. 31, 2011
Health Education [Member]
Dec. 31, 2011
Culinary Arts [Member]
Jun. 30, 2012
Design & Technology [Member]
Dec. 31, 2012
Design & Technology [Member]
Dec. 31, 2011
Design & Technology [Member]
Dec. 31, 2012
International [Member]
Dec. 31, 2011
International [Member]
Dec. 31, 2012
Transitional Schools [Member]
Dec. 31, 2012
Transitional Schools [Member]
Dec. 31, 2011
Transitional Schools [Member]
Goodwill [Line Items]                                      
Goodwill, beginning balance $ 212,626 [1] $ 374,587 [1] $ 46,148 [1] $ 45,938 $ 41,418 $ 41,418 [1] $ 41,418 [1] $ 41,871 [1] $ 41,871 [1] $ 106,497 [1] $ 73,748 [1] $ 40,752 [1] $ 40,752 [1] $ 31,899 [1] $ 41,920 [1] $ 44,037 [1]   $ 727 [1] $ 30,840 [1]
Goodwill impairment (83,350) (168,697) (210)         (41,900) (41,871) (64,626) (73,748) (41,500) (40,752)       (700) (727) (30,113)
Business acquisition 2,896 8,853                       8,853 2,896        
Effect of foreign currency exchange rate changes 853 (2,117)                         853 (2,117)      
Goodwill ending balance $ 133,025 $ 212,626 [1] $ 45,938 [1] $ 45,938 $ 41,418 $ 41,418 [1] $ 41,418 [1]     $ 41,871 [1]       $ 40,752 [1] $ 45,669 $ 41,920 [1]     $ 727 [1]
[1] Goodwill balances were reclassified upon the reorganization of our reporting segments during the fourth quarter of 2012.