Inventories (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Inventories Net
Total inventories	$ 1,456,409	$ 1,453,546
New vehicle
Inventories Net
Total inventories	954,077	1,011,299
Used vehicle
Inventories Net
Total inventories	426,751	367,350
Parts accessories and other [Member]
Inventories Net
Total inventories	$ 75,581	$ 74,897