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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | $ 58,457 | $ 28,650
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net | 1,878 | 1,966
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 18,089 | 8,035
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net | (198) | 1,107
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 26,614 | 12,512
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net | 1,660 | 372
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 3,782 | 2,060
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net | (44) | 185
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 2,527 | 1,308
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net | 15 | 70
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member] |  |
Derivative [Line Items] |  |
Currency Hedged (Buy/Sell), Gross Notional Value, Net | 7,445 | 4,735
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net | $ 445 | $ 232

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