Fair Value Measurements - Gains and Losses on Derivative Instruments in Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivatives Designated as Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives (Effective Portion)	$ (3,800)	$ (4,130)	$ 4,946	$ (1,689)
Amount of Gain (Loss) Reclassified from Cumulative Other Comprehensive Loss into Income (Effective Portion)	2,664	401	6,990	1,300
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	(289)	(245)	(81)	(173)
Not Designated as Hedging Instruments [Member] | Other Income [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 1,052	$ 88	$ 1,284	$ (44)