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Derivative Instruments and Hedging Activities - Schedule of Changes in Fair Values of Derivative Instruments Recorded in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Foreign Exchange Contracts [Member] | Other Income (Expense), Net [Member] |  |  |
Derivatives Not Designated as Hedging Instruments: |  |  |
Derivative instrument, gain or loss | $ (334) | $ 13 | $ (819)

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