Effect of Derivative Instruments (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net gain recognized in Other Comprehensive Income (OCI)		$ 13,000	$ 13,600	$ 15,900
Forward Foreign Currency Exchange Contracts | Derivatives Designated As Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Net gain recognized in Other Comprehensive Income (OCI)	[1]	9,677	17,300	18,078
Net gain reclassified from accumulated OCI into earnings	[2]	6,529	19,604	643
Net gain (loss) recognized in net loss	[3]	5,070	(727)	(294)
Forward Foreign Currency Exchange Contracts | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in net loss	[4]	$ (8,687)	$ 4,493	$ 8,010

[1] Net change in the fair value of the effective portion classified as OCI.

[2] Effective portion classified as Net Product Revenues and SG&A expense.

[3] Ineffective portion and amount excluded from effectiveness testing classified as SG&A expense

[4] Classified as SG&A expense.