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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net $ 36,893 $ 21,018
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (7) 264
U.S. Dollar/Japanese Yen [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 14,995 7,191
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net 345 920
U.S. Dollar/South Korean Won [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 15,037 9,254
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (258) (521)
U.S. Dollar/Euro [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 4,344 2,806
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (51) (85)
U.S. Dollar/U.K. Pound Sterling [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 2,517 1,767
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net $ (43) $ (50)