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Segment Reporting - Summary Financial Information by Reporting Segment (Parenthetical) (Detail) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
CTU [Member]
Dec. 31, 2011
CTU [Member]
Jun. 30, 2012
Health Education [Member]
Jun. 30, 2012
Health Education [Member]
Dec. 31, 2012
Health Education [Member]
Dec. 31, 2011
Health Education [Member]
Dec. 31, 2012
Culinary Arts [Member]
Dec. 31, 2011
Culinary Arts [Member]
Dec. 31, 2010
Culinary Arts [Member]
Dec. 31, 2012
Design & Technology [Member]
Jun. 30, 2012
Design & Technology [Member]
Dec. 31, 2012
Design & Technology [Member]
Dec. 31, 2011
Design & Technology [Member]
Dec. 31, 2012
Corporate and Other [Member]
Dec. 31, 2011
Corporate and Other [Member]
Dec. 31, 2012
Transitional Schools [Member]
Dec. 31, 2012
Transitional Schools [Member]
Dec. 31, 2011
Transitional Schools [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]                                                    
Goodwill and assets impairment charges   $ 85,600,000   $ 188,800,000 $ 2,700,000   $ 96,500,000           $ 45,400,000 $ 65,700,000   $ 94,100,000                 $ 31,000,000 $ 31,000,000
Indefinite lived intangible assets impairment charges 12,100,000                   1,000,000       8,100,000   67,800,000                  
Goodwill impairment             83,350,000 168,697,000   210,000   41,900,000 41,871,000 64,626,000   73,748,000     41,500,000 40,752,000       700,000 727,000 30,113,000
Insurance recovery related to the settlement of claims under certain insurance policies     19,000,000     7,000,000                               19,000,000 7,000,000      
Administrative expense for an estimate for potential reimbursements of government funds                   5,000,000                                
Settlement of administrative expense                 3,600,000                 4,800,000                
Legal expense related to the settlements of legal matters                                 $ 40,800,000       $ 6,000,000