Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplementary Information [Line Items]
Stock-based compensation costs	$ 34.9	$ 37.2
Interest income	1.4	1.5
Venezuela devaluation-related charges		29.0
Venezuela
Supplementary Information [Line Items]
Foreign currency exchange for remeasuring Venezuela financial statements	6.30
Net monetary assets	130
Venezuela | SICAD
Supplementary Information [Line Items]
Foreign currency exchange rate	10.70
Venezuela | SICAD-II
Supplementary Information [Line Items]
Foreign currency exchange rate	50.85
SG&A
Supplementary Information [Line Items]
Stock-based compensation costs	$ 34.9	$ 37.2