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Derivatives - Summary of Fair Value Amounts of Company's Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Forward exchange contracts, Assets $ 1,598 $ 961
Forward exchange contracts, Liabilities (219) (1,310)
Total net derivative asset (liability) designated as hedging instruments 1,379 (349)
Derivatives Designated as Hedging Instruments [Member]
   
Derivatives, Fair Value [Line Items]    
Forward exchange contracts, Assets 1,598 961
Forward exchange contracts, Liabilities (219) (1,310)
Total net derivative asset (liability) designated as hedging instruments $ 1,379 $ (349)