Derivatives and Hedging Activities - Additional Information (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Net gain (loss) to be reclassified during next 12 months	$ 30,300,000	$ 21,400,000
Designated as hedging instruments [Member] | Cross-currency interest rate swap [Member]
Derivative [Line Items]
Derivative, notional amount	750,000,000.0
Not designated as hedging instruments [Member] | Foreign currency forward contract [Member]
Derivative [Line Items]
Derivative, notional amount	1,686,400,000	1,500,400,000
Net Investment Hedging [Member] | Designated as hedging instruments [Member]
Derivative [Line Items]
Derivative, notional amount	4,113,000,000	4,139,800,000
Cash flow hedges [Member] | Foreign currency forward contract [Member]
Derivative [Line Items]
Derivative, notional amount	$ 874,400,000	$ 760,900,000