Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventories Net
New vehicles	$ 1,497,648	$ 1,429,250
Used vehicles	582,695	484,269
Commercial vehicles	121,575
Parts, accessories and other	91,472	86,687
Total inventories	$ 2,293,390	$ 2,000,206