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Derivative Instruments and Hedging Activities - Additional Information (Detail)	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2013 Forward contracts [Member] USD ($)	Jun. 30, 2012 Forward contracts [Member] USD ($)	Jun. 30, 2013 Forward contracts [Member] USD ($)	Jun. 30, 2012 Forward contracts [Member] USD ($)	Jun. 30, 2012 Forward contracts [Member] EUR (€)
Derivative [Line Items]
Foreign currency forward contracts settlement dates				Within 6 months
Impact of the forward contracts	$ (142,700,000)	$ 1,000,000	$ 142,700,000	$ 700,000	$ 142,700,000
Derivative amount contract for acquisition						4,250,000,000
Foreign currency option premium payable			$ 158,300,000		$ 158,300,000

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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