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Discontinued Operations - Summary Results of Operations for Discontinued Operations (Parenthetical) (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]        
Benefit from income taxes $ 0 [1],[2] $ 30,450,000 [1],[2] $ 0 [1],[2] $ 20,477,000 [1],[2]
Income tax expense recorded in discontinued operations   $ 39,900,000    
[1] Due to the valuation allowance against our net deferred taxes, there is no income tax benefit reported for the quarter and year to date ended September 30, 2014.
[2] Third quarter of 2013 included $39.9 million of income tax expense recorded as a result of the decision to commit to a plan of sale for the International Schools segment.