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		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments Gain Loss [Line Items]
Gain/(Loss) recognized in AOCI		$ (1,008)	$ (545)	$ (3,925)	$ 1,579
Designated As Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain/(Loss) recognized in AOCI	[1]	(1,008)	(545)	(3,925)	1,579
Designated As Hedging Instrument | Net Investment Hedge | Foreign Currency Foreign Exchange Contracts
Derivative Instruments Gain Loss [Line Items]
Gain/(Loss) recognized in AOCI	[2]	$ 40,436	$ 68,151	$ 45,657	$ 22,298

[1] The amount of gain reclassified out of AOCI into Interest expense, net was $456,000 and $1.5 million during the three-month periods ended June 30, 2019 and 2018, respectively, and $3.4 million and $2.2 million during the six-month periods ended June 30, 2019 and 2018, respectively.

[2] The amount reclassified out of AOCI into Other (income) expense, net includes the net effect of a $815,000 gain offset by a $815,000 loss recorded on repatriation of cash related to our net investment in the U.K. for the three-month period ended June 30, 2019, and $4.6 million gain offset by a $4.6 million loss recorded on repatriation of cash related to our net investment in the U.K. during the six-month period ended June 30, 2019.  There were no amounts reclassified out of AOCI for the three and six-month periods ended June 30, 2018.