Derivative Instruments And Hedging Activities - Summary of Notional Amounts of Outstanding Cross Currency Swap (Detail) - Currency Swap [Member] - Net Investment Hedging [Member] € in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019 EUR (€)	Dec. 31, 2018 EUR (€)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
1.51% [Member]
Derivative Notional Amount [Abstract]
Nature of Swap	Pay Fixed/Receive Fixed
3-month EURIBOR [Member]
Derivative Notional Amount [Abstract]
Nature of Swap	Pay Floating/Receive Floating	Pay Floating/Receive Floating
4.13% [Member]
Derivative Notional Amount [Abstract]
Nature of Swap	Pay Fixed/Receive Fixed
3-month U.S. LIBOR [Member]
Derivative Notional Amount [Abstract]
Nature of Swap	Pay Floating/Receive Floating	Pay Floating/Receive Floating
Currency Paid [Member]
Derivative Notional Amount [Abstract]
Notional amount | €	€ 2,010.4	€ 710.2
Currency Paid [Member] | 1.51% [Member]
Derivative Notional Amount [Abstract]
Notional amount | €	€ 1,079.1
Weighted Average Fixed Interest Rate	1.43%		1.43%
Currency Paid [Member] | 3-month EURIBOR [Member]
Derivative Notional Amount [Abstract]
Notional amount | €	€ 931.3	€ 710.2
Weighted Average Floating Interest Rate	Based on 3-month EURIBOR	Based on 3-month EURIBOR
Currency Received [Member]
Derivative Notional Amount [Abstract]
Notional amount | $			$ 2,300.0	$ 830.0
Currency Received [Member] | 4.13% [Member]
Derivative Notional Amount [Abstract]
Notional amount | $			$ 1,220.0
Weighted Average Fixed Interest Rate	3.96%		3.96%
Currency Received [Member] | 3-month U.S. LIBOR [Member]
Derivative Notional Amount [Abstract]
Notional amount | $			$ 1,080.0	$ 830.0
Weighted Average Floating Interest Rate	Based on 3-month USD LIBOR	Based on 3-month USD LIBOR