Fair Values of Derivative Financial Instruments Included in Consolidated Balance Sheets (Detail) - Fair Value, Observable inputs, Level 2 - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Designated as Hedging Instrument | Interest Rate Contract | Deferred rent & other long-term liabilities
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Liabilities	$ 3	$ 25
Designated as Hedging Instrument | Interest Rate Contract | Accrued expenses
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Liabilities	4	10
Not Designated as Hedging Instrument | Foreign exchange contract | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	$ 924	$ 261