Leased Vehicles, Net - Summary of Leased Vehicles (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property Subject To Or Available For Operating Lease [Line Items]
Leased property Expenses	$ 3,198,351	$ 2,145,616
Depreciation	(241,441)	(122,183)
Leased property Expenses, net	2,956,910	2,023,433
Leased Vehicles
Property Subject To Or Available For Operating Lease [Line Items]
Leased property Expenses	3,603,848	2,402,052
Origination Fees and Other Costs
Property Subject To Or Available For Operating Lease [Line Items]
Leased property Expenses	1,927	2,716
Manufacturer Subvention Payments
Property Subject To Or Available For Operating Lease [Line Items]
Leased property Expenses	$ (407,424)	$ (259,152)