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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | $ 142,789 | $ 159,394
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 3,924 | 1,317
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 43,339 | 43,770
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | (83) | (478)
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 42,082 | 59,149
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 2,191 | 570
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 31,689 | 23,515
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 1,326 | 688
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 7,320 | 11,827
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 382 | 323
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 18,359 | 21,133
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | $ 108 | $ 214

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