Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Inventories Net
New vehicles	$ 1,421,074	$ 1,029,294
Used vehicles	484,760	428,589
Parts, accessories and other	85,333	77,503
Total inventories	$ 1,991,167	$ 1,535,386