Derivative Instruments and Hedging Strategies - Summary of Derivatives Designated as Hedging Instruments Outstanding (Detail) - Derivatives Designated As Hedging Instruments - Foreign exchange contracts - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Sell
Derivative [Line Items]
Notional amount	$ 729,998	$ 820,546
Purchase
Derivative [Line Items]
Notional amount	$ 163,116	$ 212,348