Discontinued Operations - Summary Results of Operations for Discontinued Operations (Parenthetical) (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |
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Sep. 30, 2013
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Dec. 31, 2013
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Dec. 31, 2011
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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 |