Financial Derivatives - Effect of Company's Derivative Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Revenues	$ 448,885	$ 416,833	$ 906,771	$ 827,999
Gains (losses) recognized from derivatives	(42)	(164)	(7)	(410)
Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Foreign Currency Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in AOCI:	(504)	1,179	(296)	868
Revenues [Member] | Derivatives Designated as Hedging Instruments under ASC 815 [Member] | Cash Flow Hedges [Member] | Foreign Currency Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from AOCI:	(676)	1,438	(1,433)	2,364
Other Income (Expense), Net [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Currency Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized from derivatives	$ (42)	$ (164)	$ (7)	$ (410)