Derivative Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative [Line Items]
Gains and losses due to change in fair value attributable to changes in spot exchange rates	$ (50,271)	$ (1,166)
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	$ 7,300

Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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