Guarantor Consolidating Financial Statements Current Period Guarantor Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 2,896,870	$ 1,289,494	$ 608,791	$ 572,297
Notes, Loans and Financing Receivable, Net	11,502,472	10,998,274
Restricted Cash and Investments	778,213	728,908
Restricted Cash and Cash Equivalents	53,101	14,808
Property, Plant and Equipment, Net	50,801	52,076
Property Subject to or Available for Operating Lease, Net	2,103,961	1,702,867
Deferred Tax Assets, Net	81,559	107,075
Goodwill	1,108,011	1,108,278
Intercompany Receivable	45,733	66,360
Other Assets	133,458	128,931
Assets	18,754,179	16,197,071
Line of Credit Facility, Amount Outstanding	2,719,134	354,203
Securitized Debt Obligation Liability	9,029,694	9,023,308
Senior Notes	1,500,000	1,500,000
Accounts Payable And Accrued Expenses	235,866	217,938
Deferred Revenue	94,023	69,784
Taxes Payable	97,175	93,462
Intercompany Taxes Payable	594,806	558,622
Derivative Liabilities	3,052	527
Due to Affiliate
Liabilities	14,273,750	11,817,844
Additional Paid in Capital, Common Stock	3,460,532	3,459,195
Accumulated Other Comprehensive Income (Loss), Net of Tax	(9,332)	(3,254)
Retained Earnings (Accumulated Deficit)	1,029,229	923,286
Stockholders' Equity Attributable to Parent	4,480,429	4,379,227
Liabilities and Equity	18,754,179	16,197,071
Parent Company [Member]
Guarantor [Line Items]
Property, Plant and Equipment, Net	220	220
Deferred Tax Assets, Net	38,449	38,217
Goodwill	1,094,923	1,094,923
Intercompany Receivable	45,733	66,360
Other Assets	13,549	13,773
Due from Affiliates	2,105,490	2,063,179
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,387,674	3,274,348
Assets	6,686,038	6,551,020
Senior Notes	1,500,000	1,500,000
Accounts Payable And Accrued Expenses	19,026	22,519
Taxes Payable	91,777	90,652
Intercompany Taxes Payable	594,806	558,622
Derivative Liabilities
Liabilities	2,205,609	2,171,793
Additional Paid in Capital, Common Stock	3,460,532	3,459,195
Accumulated Other Comprehensive Income (Loss), Net of Tax	(9,332)	(3,254)
Retained Earnings (Accumulated Deficit)	1,029,229	923,286
Stockholders' Equity Attributable to Parent	4,480,429	4,379,227
Liabilities and Equity	6,686,038	6,551,020
Guarantor Subsidiaries [Member]
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	2,835,147	1,252,190	537,671	500,556
Notes, Loans and Financing Receivable, Net	409,499	1,557,840
Property, Plant and Equipment, Net	3,842	4,328
Deferred Tax Assets, Net	(105,838)	(27,731)
Other Assets	20,053	17,677
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,433,617	2,192,607
Assets	6,596,320	4,996,911
Accounts Payable And Accrued Expenses	106,918	88,692
Taxes Payable	4,332	4,229
Intercompany Taxes Payable
Derivative Liabilities	3,052	394
Due to Affiliate	3,131,750	1,669,061
Liabilities	3,246,052	1,762,376
Additional Paid in Capital, Common Stock	79,187	79,187
Accumulated Other Comprehensive Income (Loss), Net of Tax	(10,801)	(10,801)
Retained Earnings (Accumulated Deficit)	3,281,882	3,166,149
Stockholders' Equity Attributable to Parent	3,350,268	3,234,535
Liabilities and Equity	6,596,320	4,996,911
Non-Guarantor Subsidiaries [Member]
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	61,723	37,304	71,120	71,741
Notes, Loans and Financing Receivable, Net	11,092,973	9,440,434
Restricted Cash and Investments	778,213	728,908
Restricted Cash and Cash Equivalents	53,101	14,808
Property, Plant and Equipment, Net	46,739	47,528
Property Subject to or Available for Operating Lease, Net	2,103,961	1,702,867
Deferred Tax Assets, Net	148,948	96,589
Goodwill	13,088	13,355
Intercompany Receivable
Other Assets	99,856	97,481
Due from Affiliates	1,026,260
Assets	15,424,862	12,179,274
Line of Credit Facility, Amount Outstanding	2,719,134	354,203
Securitized Debt Obligation Liability	9,029,694	9,023,308
Senior Notes
Accounts Payable And Accrued Expenses	109,922	106,727
Deferred Revenue	94,023	69,784
Taxes Payable	1,066	(1,419)
Intercompany Taxes Payable
Derivative Liabilities		133
Due to Affiliate		394,118
Liabilities	11,953,839	9,946,854
Common Stock, Value, Issued	579,600	569,836
Additional Paid in Capital, Common Stock	1,212,873	122,425
Accumulated Other Comprehensive Income (Loss), Net of Tax	7,123	13,151
Retained Earnings (Accumulated Deficit)	1,671,427	1,527,008
Stockholders' Equity Attributable to Parent	3,471,023	2,232,420
Liabilities and Equity	15,424,862	12,179,274
Consolidation, Eliminations [Member]
Guarantor [Line Items]
Due from Affiliates	(3,131,750)	(2,063,179)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(6,821,291)	(5,466,955)
Assets	(9,953,041)	(7,530,134)
Due to Affiliate	(3,131,750)	(2,063,179)
Liabilities	(3,131,750)	(2,063,179)
Common Stock, Value, Issued	(579,600)	(569,836)
Additional Paid in Capital, Common Stock	(1,292,060)	(201,612)
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,678	(2,350)
Retained Earnings (Accumulated Deficit)	(4,953,309)	(4,693,157)
Stockholders' Equity Attributable to Parent	(6,821,291)	(5,466,955)
Liabilities and Equity	$ (9,953,041)	$ (7,530,134)