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Impact from Foreign Exchange Derivative Instruments Designated as Cash Flow Hedges (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recorded in accumulated other comprehensive loss	$ 316	$ (1,280)	$ 1,043	$ (1,399)
(Gain) loss reclassified from accumulated other comprehensive loss into earnings	(1,253)	88	(78)	(1,092)
Foreign Currency Forward Contracts | Cash Flow Hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recorded in accumulated other comprehensive loss	316	(1,280)	1,043	(1,399)
(Gain) loss reclassified from accumulated other comprehensive loss into earnings	$ (1,253)	$ 88	$ (78)	$ (1,092)

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Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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