Note 7 - Equity-Based Compensation (Detail) - Stock Options Additional Disclosure (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amount collected from stock option exercises	$ 0.9	$ 2.1	$ 2.3
Total intrinsic value of stock option exercises	0.2	1.1	1.2
Tax benefit of stock option exercises recorded in additional paid-in-capital	0.1	0.1	0.1
Aggregate intrinsic value of outstanding stock options	3.4	1.0	8.6
Aggregate intrinsic value of exercisable stock options	$ 2.3	$ 0.8	$ 4.5