Derivative Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Detail) - Forward Currency Contracts [Member] - Derivatives Not Designated as Hedge Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Derivatives Fair Value [Line Items]
Gain (loss) recognized in statement of operations	$ 225	$ (236)	$ 226
Forward Currency Contracts [Member] | Foreign Currency Transaction Gains (Losses) [Member]
Derivatives Fair Value [Line Items]
Gain (loss) recognized in statement of operations	$ 225	$ (236)	$ 226