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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | $ 120,208 | $ 89,989
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 2,442 | 1,223
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 30,522 | 26,848
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 763 | (136)
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 50,049 | 34,777
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 1,342 | 915
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 18,040 | 10,987
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 156 | 19
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 6,067 | 4,587
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | 117 | 61
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 15,530 | 12,790
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net | $ 64 | $ 364

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