Derivative Instruments And Hedging Activities - Additional Information (Detail) € in Millions, $ in Millions	Jun. 30, 2017 EUR (€)	Jun. 30, 2017 USD ($)
Derivatives Designated as Investment Hedges [Member] | Currency Swap [Member] | Cross-Currency Paid [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount	€ 100.0
Derivative, swaption interest rate	1.75%	1.75%
Derivatives Designated as Investment Hedges [Member] | Currency Swap [Member] | Cross-Currency Received [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount | $		$ 110.5
Derivative, swaption interest rate	3.945%	3.945%
Derivatives Designated as Investment Hedges [Member] | Net Investment Hedging [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount	€ 400.0
Bureau van Dijk (BvD) [Member] | Foreign Exchange Option [Member] | Call Option [Member]
Derivative [Line Items]
Notional amount	2,700.0
Bureau van Dijk (BvD) [Member] | Foreign Exchange Option [Member] | Put Option [Member]
Derivative [Line Items]
Notional amount	€ 2,700.0