Derivative Instruments and Hedging Activities Carrying Values of Derivative Instruments (Detail) - Designated as Hedging Instrument - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Net Carrying Value		$ (2,767)	$ 463
Foreign Exchange Contract
Derivative [Line Items]
Derivative Net Carrying Value	[1]	1,976	3,128
Interest rate contract
Derivative [Line Items]
Derivative Net Carrying Value	[1]	(4,743)
Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Fair Value— Assets		1,976	3,128
Prepaid Expenses and Other Current Assets | Foreign Exchange Contract
Derivative [Line Items]
Fair Value— Assets	[1]	1,976	3,128
Prepaid Expenses and Other Current Assets | Interest rate contract
Derivative [Line Items]
Fair Value— Assets	[1]	(4,743)	(2,665)
Other Current Liabilities
Derivative [Line Items]
Fair Value— (Liabilities)		$ (4,743)	(2,665)
Other Current Liabilities | Foreign Exchange Contract
Derivative [Line Items]
Fair Value— (Liabilities)	[1]		$ 0

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