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Fair Values of Derivative Financial Instruments Included in Consolidated Balance Sheets (Detail) - Fair Value, Observable inputs, Level 2 - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Designated as Hedging Instrument | Interest Rate Contract | Prepaid expenses    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Assets   $ 11
Designated as Hedging Instrument | Interest Rate Contract | Accrued expenses    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Assets $ 66  
Designated as Hedging Instrument | Interest Rate Contract | Deferred rent & other long-term liabilities    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Assets 286  
Not Designated as Hedging Instrument | Foreign exchange contract | Accrued expenses    
Derivatives, Fair Value [Line Items]    
Fair Value of Derivative Assets $ 196 $ 1,951