Amounts Recognized for Share-Based Compensation (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total cost of share-based compensation plans	$ 52,000,000	$ 55,400,000	$ 58,100,000
Amounts capitalized in inventory and fixed assets	(1,500,000)	(1,500,000)	(1,500,000)
Amounts charged against income for amounts previously capitalized in inventory and fixed assets	1,600,000	1,600,000	1,600,000
Amounts charged against income	52,100,000	55,500,000	58,200,000
Amount of related income tax benefit recognized in income	$ 18,800,000	$ 18,700,000	$ 21,400,000