Fair Value Measurements - Gains and Losses on Derivative Instruments in Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivatives Designated as Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain recognized in Other comprehensive income on derivatives (Effective Portion)	$ (2,471)	$ 11,127	$ 9,020
Amount of gain reclassified from Accumulated other comprehensive loss into Income (Effective Portion)	100	(13,446)	3,699
Amount of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)	0	(136)	(188)
Foreign Exchange Contracts | Not designated as hedging instruments: | Other non-operating income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (156)	$ 174	$ 121