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Fair Value of Outstanding Derivative Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]    
Derivative assets $ 9  
Derivative liabilities   $ 64
Foreign exchange forward contracts | Derivatives designated as cash flow hedging instruments    
Derivative [Line Items]    
Derivative assets $ 9  
Derivative liabilities   12
Foreign exchange option contracts | Derivatives designated as cash flow hedging instruments    
Derivative [Line Items]    
Derivative liabilities   $ 52