Summary of Effects of Interest Rate Swap Agreements and Foreign Currency Foreign Exchange Contracts on Result of Operations (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments Gain Loss [Line Items]
Gain/(Loss) recognized in AOCI			$ (1,924)	$ (3,925)	$ (345)
Designated As Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain/(Loss) recognized in AOCI	[1]	$ 0	(1,924)	(3,925)	(345)
Designated As Hedging Instrument | Net Investment Hedge | Foreign Currency Foreign Exchange Contracts
Derivative Instruments Gain Loss [Line Items]
Gain/(Loss) recognized in AOCI	[2]	$ 33,927	$ 3,790	$ 79,584	$ 26,088

[1] The amount of gain reclassified out of AOCI into Interest expense, net was $0 and $2.0 million during the three-month periods ended September 30, 2019 and 2018, respectively, and $3.4 million and $4.2 million during the nine-month periods ended September 30, 2019 and 2018, respectively.

[2] The amount reclassified out of AOCI into Other (income) expense, net includes the net effect of a $1.1 million gain offset by a $1.1 million loss recorded on repatriation of cash related to our net investment in the U.K. for the three-month period ended September 30, 2019, and a $5.7 million gain offset by a $5.7 million loss recorded on repatriation of cash related to our net investment in the U.K. during the nine-month period ended September 30, 2019.  There were no amounts reclassified out of AOCI for the three and nine-month periods ended September 30, 2018.