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Discontinued Operations - Summary Results of Operations for Discontinued Operations (Parenthetical) (Detail) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2011
Discontinued Operations And Disposal Groups [Abstract]      
Income tax expense $ 39,900,000 $ 87,900,000  
Gain on sale of business   (123,204,000) (27,085,000)
Income tax expense related to sale of schools     300,000
Goodwill allocated     $ 20,200,000