Note 7 - Equity-Based Compensation (Detail) - Stock Options Additional Disclosure (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Amount collected from stock option exercises	$ 2.1	$ 2.3		$ 1.1
Total intrinsic value of stock option exercises	1.1	1.2		0.4
Tax benefit of stock option exercises recorded in additional paid-in-capital	0.1	0.1	[1]	0.1	[1]
Aggregate intrinsic value of outstanding stock options	1.0	8.6		6.9
Aggregate intrinsic value of exercisable stock options	$ 0.8	$ 4.5		$ 2.0

[1] Less than