Note 2 - Significant Accounting Policies (Detail) - Goodwill (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Acquisition of Peck Road Ford [Member]	Dec. 31, 2012 West Texas Peterbilt Acquisition [Member]	Dec. 31, 2012 Acquisition of MVI Group [Member]
Balance January 1, 2012	$ 198,257	$ 182,612	$ 182,612
Balance December 31, 2012	198,257	182,612	182,612
Goodwill, acquired during period				$ 36	$ (1,730)	$ 17,339