Leased Vehicles Leased Vehicles Summary (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Leased Vehicles Summary [Line Items]
Leased Vehicles Accounted For Operating Leases Net Of Manufacturing Incentives	$ 1,526,609	$ 468,540	$ 886,956	$ 51,515
Leased Vehicles Purchased	299,287	188,706	1,077,446	688,137
Leased Vehicles Returned (End of Term)	(17,178)	(8,928)	(43,449)	(22,575)
Leased Vehicles Returned (Default)	(1,605)	(196)	(3,783)	(578)
Manufacturing Incentives	(42,496)	(19,303)	(149,337)	(87,680)
Foreign Currency Translation On Leases	20,952	(15,451)	17,736	(15,451)
Leased Vehicles Accounted For Operating Leases Net Of Manufacturing Incentives	$ 1,785,569	$ 613,368	$ 1,785,569	$ 613,368