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Financial Assets and Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Detail) - Fair Value, Measurements, Recurring - Foreign currency forward contracts - Non-hedging derivative
$ in Thousands
Dec. 31, 2014
USD ($)
Prepaid expenses and other current assets  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative assets $ 1,647
Accounts payable and accrued expenses  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative liabilities 6
Level 1 | Prepaid expenses and other current assets  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative assets 0
Level 1 | Accounts payable and accrued expenses  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative liabilities 0
Level 2 | Prepaid expenses and other current assets  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative assets 1,647
Level 2 | Accounts payable and accrued expenses  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative liabilities 6
Level 3 | Prepaid expenses and other current assets  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative assets 0
Level 3 | Accounts payable and accrued expenses  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative liabilities $ 0