Note 1 - Nature of Operations and Basis of Presentation (Detail) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2010	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Number of Businesses Acquired		2	9	14	11	3
Number of Service Centers		54
Number of States in which Entity Operates		50
Stock Issued During Period, Shares, New Issues (in Shares)	9.3