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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net $ 36,529 $ 41,448
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (3) (349)
U.S. Dollar/Japanese Yen [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 11,763 13,992
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net 746 961
U.S. Dollar/South Korean Won [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 18,081 19,374
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (636) (1,180)
U.S. Dollar/Euro [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 4,241 4,217
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net (76) (57)
U.S. Dollar/U.K. Pound Sterling [Member]
    
Derivative [Line Items]    
Currency Hedged (Buy/Sell), Gross Notional Value, Net 2,444 3,865
Currency Hedged (Buy/Sell), Fair Value, Asset/(Liability), Net $ (37) $ (73)