Derivative Instruments And Hedging Activities - Additional Information (Detail) - Derivatives Designated as Accounting Hedges [Member] - Cross-Currency Swap [Member] € in Millions	Mar. 31, 2019 EUR (€)
Net Investment Hedging [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount	€ 500.0
2021 [Member]
Derivative [Line Items]
Notional amount	422.5
2022 [Member]
Derivative [Line Items]
Notional amount	287.7
2023 [Member]
Derivative [Line Items]
Notional amount	441.9
2024 [Member]
Derivative [Line Items]
Notional amount	€ 442.6