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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net $ 48,667 $ 21,018
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (1,117) 264
U.S. Dollar/Japanese Yen [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 16,170 7,191
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (194) 920
U.S. Dollar/South Korean Won [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 17,742 9,254
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (758) (521)
U.S. Dollar/Euro [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 4,188 2,806
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (11) (85)
U.S. Dollar/U.K. Pound Sterling [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 2,340 1,767
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (67) (50)
U.S. Dollar/Taiwan Dollar [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 8,227  
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net $ (87)