Note 7 - Equity-Based Compensation (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years	7 years	7 years
Price Per Share For Intrinsic Value Calculation Stock Options (in Dollars per share)	$ 22.19	$ 15.34	$ 26.51
Restricted Stock [Member]
Allocated Share-based Compensation Expense	$ 4.0	$ 3.7	$ 4.3
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	6.0
Deferred Stock Units [Member]
Allocated Share-based Compensation Expense	0.7	0.7	0.7
Stock Options [Member]
Allocated Share-based Compensation Expense	2.1	2.0	1.7
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 2.3
The 2009 Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	0.9
The 2011 Non-Employee Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)	0.2