Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative [Line Items]
Gains and losses due to change in fair value attributable to changes in spot exchange rates	$ 14,876	$ (564)	$ (32,912)	$ (1,730)
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	$ (2,100)		$ 5,200