Change in Fair Value of Forward Contracts (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss from the change in the fair value of forward contracts included in other (expense) income, net	$ (319)		$ (319)	$ (532)
Foreign currency transaction losses from the remeasurement of foreign currency assets and liabilities	$ (412)	$ (2,845)	$ (4,342)	$ (2,527)