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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, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |
Notional Amounts (in U.S. dollars) | $ 74,355 | $ 128,541
Net Unrealized Gain (Loss) | 3,128 | (426)
Australian Dollar |  |
Derivative [Line Items] |  |
Notional Amounts (in U.S. dollars) | 0 | 24,250
Net Unrealized Gain (Loss) | 0 | (134)
Canadian Dollar |  |
Derivative [Line Items] |  |
Notional Amounts (in U.S. dollars) | 55,133 | 94,292
Net Unrealized Gain (Loss) | 2,564 | (159)
Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts (in U.S. dollars) | 19,222 | 9,999
Net Unrealized Gain (Loss) | $ 564 | $ (133)

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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