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Derivative Instruments and Hedging Activities - Open Foreign Currency Contracts (Detail) - Cash Flow Hedging - Foreign exchange contracts, net - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Notional Amounts (in U.S. dollars) | $ 134,354 | $ 74,355
Net Unrealized Gain (Loss) | (76) | 3,128
Australian Dollar |  |
Derivative [Line Items] |  |
Notional Amounts (in U.S. dollars) | 15,971 | 0
Net Unrealized Gain (Loss) | (86) | 0
Canadian Dollar |  |
Derivative [Line Items] |  |
Notional Amounts (in U.S. dollars) | 101,397 | 55,133
Net Unrealized Gain (Loss) | (1,069) | 2,564
Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts (in U.S. dollars) | 16,986 | 19,222
Net Unrealized Gain (Loss) | $ 1,079 | $ 564

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