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Financial Instruments - Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments (Detail) (Foreign Exchange-Forward Contracts (Current) [Member], Not Designated as Hedging Instruments [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Prepaid Expenses and Other Current Assets [Member]
Dec. 31, 2012
Accrued and Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset      
Liability 160 64
U.S. Dollar Notional $ 6,604 $ 2,710