Financial Statement Effects of the Merger (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 02, 2010	Sep. 30, 2010	Jun. 30, 2010	Jun. 30, 2009	Sep. 30, 2010 Predecessor [Member]	Jun. 30, 2010 Predecessor [Member]	Dec. 31, 2009 Predecessor [Member]	Sep. 30, 2009 Predecessor [Member]	Jun. 30, 2009 Predecessor [Member]	Oct. 02, 2010 Purchase Price Allocation Adjustments [Member]	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Successor [Member]	Dec. 31, 2010 Successor [Member]	Oct. 02, 2010 Successor [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 4,200,000																$ 3,453,917
Liabilities and Equity	16,197,071	13,042,920						10,107,410					(2,191,093)				7,916,317
Stockholders' Equity Attributable to Parent	4,379,227	3,923,038						2,450,621		2,218,392	2,150,273		(2,450,621)			3,530,108
Treasury Stock, Value								(39,966)	(38,915)			(36,363)	39,966
Stockholders' Equity before Treasury Stock								2,490,587					(2,490,587)
Retained Earnings (Accumulated Deficit)	923,286	460,160						2,150,480					(2,150,480)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3,254)	(7,617)						17,153	11,870				(17,153)	(3,254)	(7,617)	1,558
Additional Paid in Capital, Common Stock	3,459,195	3,470,495						321,576					(321,576)
Common Stock, Value, Issued								1,378					(1,378)
Liabilities	11,817,844	9,119,882						7,656,789		8,071,112	9,065,459		259,528			7,388,630	7,916,317
Accounts Payable And Accrued Expenses	217,938	160,172						275,837					76,615				352,452
Securitized Debt Obligation Liability	9,023,308	6,937,841						6,273,224					135,404				6,408,628
Convertible Senior Notes		500						419,693					42,015				461,708
Senior Notes	1,500,000	500,000						70,620					1,810				72,430
Line of Credit Facility, Amount Outstanding	354,203	1,099,391						617,415					3,684				621,099
Assets	16,197,071	13,042,920						10,107,410		10,289,504	11,215,732		1,262,824			10,918,738	11,370,234
Other Assets	128,931	141,248						143,064					(25,917)				117,147
Deferred Tax Assets, Net of Valuation Allowance	254,868	181,352						77,999					101,102				179,101
Property Subject to or Available for Operating Lease, Net	1,702,867	809,491						54,730					(1,223)				53,507
Property, Plant and Equipment, Net	52,076	47,440						36,592					10,282				46,874
Loans and Leases Receivable, Net Reported Amount	10,998,274	9,162,492						8,147,086					83,657				8,230,743
Loans and Leases Receivable, Allowance								(528,489)					528,489
Loans and Leases Receivable, Gross								8,675,575					(444,832)				8,230,743
Restricted Cash and Cash Equivalents	14,808	136,556						134,468									134,468
Restricted Cash and Investments	728,908	919,283						975,942									975,942
Cash and Cash Equivalents, at Carrying Value	1,289,494	572,297	194,554	537,529	537,529	282,273	193,287	537,529									537,529
Goodwill	$ 1,108,278	$ 1,107,982	$ 1,100,000										$ 1,094,923	$ 1,108,278	$ 1,107,982	$ 1,094,923	$ 1,094,923