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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 |

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