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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]        
Gains and losses due to change in fair value attributable to changes in spot exchange rates $ (13,413) $ (21,663) $ (46,325) $ (23,393)
Net Investment Hedges | Foreign Currency Contracts        
Derivative [Line Items]        
Gains and losses due to change in fair value attributable to changes in spot exchange rates $ 100   $ 5,200