Summary of Notional Amounts of Outstanding Foreign Exchange Forwards, Cash Flow Hedging (Detail) (Cash Flow Hedging [Member], Forward Contracts [Member]) In Millions, unless otherwise specified	Jun. 30, 2014 Foreign Currency Forward Contracts to Purchase US Dollars with Euros [Member] USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts to Purchase US Dollars with Euros [Member] USD ($)	Jun. 30, 2014 Foreign Currency Forward Contracts To Sell US Dollars For Euros [Member] USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts To Sell US Dollars For Euros [Member] USD ($)	Jun. 30, 2014 Foreign Currency Forward Contracts to Purchase US Dollars With GBP [Member] USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts to Purchase US Dollars With GBP [Member] USD ($)	Jun. 30, 2014 Foreign Currency Forward Contracts To Purchase US Dollars With Other Foreign Currencies [Member] USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts To Purchase US Dollars With Other Foreign Currencies [Member] USD ($)	Jun. 30, 2014 Foreign Currency Forward Contracts to Sell US Dollars for Other Foreign Currencies [Member] USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts to Sell US Dollars for Other Foreign Currencies [Member] USD ($)	Jun. 30, 2014 Foreign Currency Forward Contracts To Purchase Euros With Other Foreign Currencies [Member] EUR (€)	Dec. 31, 2013 Foreign Currency Forward Contracts To Purchase Euros With Other Foreign Currencies [Member] EUR (€)	Jun. 30, 2014 Foreign Currency Forward Contracts To Purchase Euros With GBP [Member] EUR (€)	Dec. 31, 2013 Foreign Currency Forward Contracts To Purchase Euros With GBP [Member] EUR (€)	Jun. 30, 2014 Foreign Currency Forward Contracts to Sell Euros for GBP [Member] EUR (€)	Dec. 31, 2013 Foreign Currency Forward Contracts to Sell Euros for GBP [Member] EUR (€)
Derivative [Line Items]
Derivative Notional Amount	$ 71.1	$ 14.2	$ 54.7	$ 53.2	$ 0.7	$ 0	$ 1.9	$ 0	$ 20.1	$ 0	€ 53.8	€ 13.1	€ 24.1	€ 22.1	€ 67.3	€ 0