Derivatives and Hedging Activities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Foreign currency exchange gain	$ (186,763,000)	$ (204,065,000)	$ (18,203,000)
Net losses reclassified from accumulated other comprehensive income (loss) to operating expenses	6,256,000
Gains reclassified from accumulated other comprehensive income (loss) to revenue	27,973,000	4,332,000
Designated as hedging instruments [Member]
Derivative [Line Items]
Foreign currency exchange gain	4,484,000
Not designated as hedging instruments [Member] | Embedded derivatives [Member]
Derivative [Line Items]
Net gain (loss) on embedded derivatives		3,807,000	4,836,000
Not designated as hedging instruments [Member] | Economic hedges of embedded derivatives [Member]
Derivative [Line Items]
Net gain (loss) on embedded derivatives	(2,287,000)	(2,602,000)	$ (4,497,000)
Not designated as hedging instruments [Member] | Foreign currency forward and option contracts [Member]
Derivative [Line Items]
Gains (losses) from foreign currency forward contracts	$ (24,319,000)	$ 12,657,000