Share-Based Employee Compensation Plans and Other Compensation and Benefit Plans (Profit Sharing and Savings Plan Narrative) (Detail) (Profit Sharing And Savings Plan [Member], USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Profit Sharing And Savings Plan [Member]
Other employee benefit plan descriptions	The Company sponsors a contributory profit sharing and savings plan that covers substantially all employees who are at least 21 years of age and have at least six months of service. The Company makes matching contributions equal to 100% of the first 2% of each employee's wages that are contributed and 25% of the next 4% of each employee's wages that are contributed.
Compensation expense for benefit plans	$ 0	$ 0	$ 6.8
Income tax benefit from compensation expense for benefit plans	$ 0	$ 0	$ 2.7
Issuance of common stock under employee benefit plans, shares	0.0	0.0	200,000.0
Average grant-date fair value of shares issued during the period in compensation and benefit plans other than stock options	$ 0.00	$ 0.00	$ 35.37