Derivatives and Hedge Accounting - Summary of Effect of Foreign Currency Exchange Contracts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized in consolidated statements of income	$ (3,752)	$ (4,787)	$ (2,839)
Derivatives in cash flow hedging relationships | Derivative designated as hedging instruments | Foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain/(loss) recognized in AOCI	8,773	(13,919)	19,802
Reclassification out of Accumulated Other Comprehensive Income | Fair value hedge | Derivative designated as hedging instruments | Foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(loss) recognized in consolidated statements of income	$ 3,306	$ (3,224)	$ 5,056