Financial Instruments - Additional Information (Detail)		3 Months Ended		9 Months Ended
	Sep. 17, 2018 USD ($)	Sep. 30, 2018 USD ($) contract	Sep. 30, 2017 USD ($) swap	Sep. 30, 2018 USD ($) contract	Sep. 30, 2017 USD ($) swap
Derivative [Line Items]
Derivative losses included in AOCI		$ 6,900,000
Net investment hedge ineffectiveness				$ 0
Cash flow hedge ineffectiveness		0		$ 0
Foreign currency contract
Derivative [Line Items]
Term of derivative				12 months
Interest rate swaps
Derivative [Line Items]
Number of instruments terminated (swap) | swap			2		2
Foreign currency contract and two interest rate swap agreements
Derivative [Line Items]
Notional amount		1,900,000,000		$ 1,900,000,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (3,900,000)
Not Designated as Hedging Instrument [Member] | Foreign currency contracts
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		$ 34,741,000	$ 4,024,000	$ 21,853,000	$ (9,157,000)
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign currency contract
Derivative [Line Items]
Number of derivatives matured (contract) | contract		4		4
Deal Contingent Swaps | Other income (expense), net | Not Designated as Hedging Instrument [Member] | Foreign currency contracts
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		$ 1,175,000	0	$ 12,154,000	0
Deal Contingent Swaps | Interest expense | Not Designated as Hedging Instrument [Member] | Interest rate swaps
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net		$ 25,289,000	$ 0	$ 352,000	$ 0