Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended			1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Mar. 18, 2013 Stock Split	Sep. 30, 2013 Venezuela Operations
Supplementary Information [Line Items]
Stock split additional shares issuable						One additional share of common stock for every two shares of common stock.
Stock split conversion ratio						1.5
Common stock, par value	$ 0.01		$ 0.01		$ 0.01	$ 0.01
Stock-based compensation costs	$ 5.4	$ 5.6	$ 49.9	$ 30.2
Interest income	1.3	1.7	4.2	4.8
Official exchange rate of foreign currency (per U.S. dollar) for remeasuring company's consolidated financial statements							6.30
Venezuela devaluation-related charges			$ 29.0