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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | $ 144,002 | $ 159,394
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 3,170 | 1,317
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 39,022 | 43,770
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 302 | (478)
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 54,077 | 59,149
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 1,424 | 570
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 20,146 | 23,515
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 916 | 688
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 10,921 | 11,827
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 125 | 323
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 19,836 | 21,133
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | $ 403 | $ 214

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