Derivative Instruments and Hedging Activities Carrying Values of Derivative Instruments (Detail) - Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative Net Carrying Value	$ (22,000)	$ (8,100)
Foreign Exchange Contract
Derivative [Line Items]
Derivative Net Carrying Value	(2,000)	(100)
Interest rate contract
Derivative [Line Items]
Derivative Net Carrying Value	(20,000)	(8,000)
Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Fair Value— Assets	400	1,100
Prepaid Expenses and Other Current Assets | Foreign Exchange Contract
Derivative [Line Items]
Fair Value— Assets	400	1,100
Prepaid Expenses and Other Current Assets | Interest rate contract
Derivative [Line Items]
Fair Value— Assets	0	(8,000)
Fair Value— (Liabilities)	(20,000)
Other Current Liabilities
Derivative [Line Items]
Fair Value— (Liabilities)	(22,400)	(9,200)
Other Current Liabilities | Foreign Exchange Contract
Derivative [Line Items]
Fair Value— (Liabilities)	$ (2,400)	$ (1,200)