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Other Expense (Income), Net - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Component Of Other Expense Income Nonoperating [Line Items]        
Impairment charge $ 21,200,000 $ 6,200,000 $ 0 $ 21,200,000
Carrying value of the investment   $ 0