Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Inventories Net
New vehicles	$ 1,299,364	$ 1,051,120
Used vehicles	479,460	441,655
Parts, accessories and other	85,949	79,793
Total inventories	$ 1,864,773	$ 1,572,568