Derivative Instruments And Hedging Activities - Additional Information (Detail) € in Millions, $ in Millions	Mar. 31, 2016 EUR (€)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)
Interest Rate Swap [Member] | 2010 Senior Notes [Member]
Derivative [Line Items]
Notional amount						$ 250.0	$ 250.0
Interest Rate Swap [Member] | 2014 Senior Notes (5-Year) [Member]
Derivative [Line Items]
Notional amount					$ 200.0	$ 250.0
Interest Rate Cap [Member] | 2014 Senior Notes (30-Year) [Member]
Derivative [Line Items]
Notional amount				$ 150.0
Derivatives Not Designated as Investment Hedges [Member] | Currency Swap [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount				$ 100.0
Derivatives Designated as Investment Hedges [Member] | Currency Swap [Member] | 2015 Senior Notes [Member] | Cross-Currency Paid [Member]
Derivative [Line Items]
Notional amount		$ 110.5
Derivative, swaption interest rate	3.945%	3.945%
Derivatives Designated as Investment Hedges [Member] | Currency Swap [Member] | 2015 Senior Notes [Member] | Cross-Currency Received [Member]
Derivative [Line Items]
Notional amount | €	€ 100.0
Derivative, swaption interest rate	1.75%	1.75%
Net Investment Hedging [Member] | Derivatives Designated as Investment Hedges [Member] | 2015 Senior Notes [Member]
Derivative [Line Items]
Notional amount | €			€ 400.0