Leased Vehicles Leased Vehicles Summary (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2010 Predecessor [Member]	Jun. 30, 2010 Predecessor [Member]	Dec. 31, 2010 Successor [Member]	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Successor [Member]
Leased Vehicles Summary [Line Items]
Leased Vehicles Accounted For Operating Leases Net Of Manufacturing Incentives		$ 1,975,624	$ 886,956	$ 190,300	$ 239,646	$ 54,730	$ 886,956	$ 51,515
Leased Vehicles Purchased						11,371	1,342,818	1,000,200
Leased Vehicles Returned (End of Term)				(75,986)	(45,040)	(14,041)	(76,052)	(28,723)
Leased Vehicles Returned (Default)				(850)	(4,306)	(545)	(7,492)	(1,139)
Manufacturing Incentives							(180,462)	(126,520)
Foreign Currency Translation On Leases							9,856	(8,377)
Leased Vehicles Accounted For Operating Leases Net Of Manufacturing Incentives		$ 1,975,624	$ 886,956	$ 113,464	$ 190,300	$ 51,515	$ 1,975,624	$ 886,956