Derivatives and Hedge Accounting - Summary of Effect of Foreign Currency Exchange Contracts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
(Loss)/gain recognized in consolidated statements of income	$ (4,787)	$ (2,839)	[1]	$ (5,597)	[1]
Derivatives in cash flow hedging relationships | Derivative designated as hedging instruments | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
(Loss)/gain recognized in AOCI	13,919	(19,802)		(5,129)
Reclassification out of Accumulated Other Comprehensive Income | Derivatives in cash flow hedging relationships | Derivative designated as hedging instruments | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
(Loss)/gain recognized in consolidated statements of income	0	0		(2,669)
Reclassification out of Accumulated Other Comprehensive Income | Fair value hedge | Derivative designated as hedging instruments | Foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
(Loss)/gain recognized in consolidated statements of income	$ 3,224	$ (5,056)		$ (4,790)

[1] Adjusted pursuant to adoption of ASU No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-retirement Benefit Cost. Refer to Note 21 and Note 27 to the consolidated financial statements.