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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | $ 161,278 | $ 159,394
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 1,897 | 1,317
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 46,933 | 43,770
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | (508) | (478)
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 52,484 | 59,149
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 1,523 | 570
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 31,603 | 23,515
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 306 | 688
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 10,208 | 11,827
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 276 | 323
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 20,050 | 21,133
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | $ 300 | $ 214

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