Guarantor Consolidating Financial Statements Guarantor Income Statements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2010
Guarantor [Line Items]
Financial Services Revenue									$ 264,347	$ 342,349	$ 1,594,174	$ 1,246,687	$ 1,431,319
Operating Leases, Income Statement, Lease Revenue									4,418	15,888	289,256	97,676	44,316
Other Income									12,406	14,387	77,105	65,625	47,182
Equity In Income Of Affiliates
Revenues	528,104	514,517	486,511	431,403	394,255	390,681	329,885	295,167	281,171	372,624	1,960,535	1,409,988	1,522,817
Operating Expenses									70,441	68,855	397,582	338,540	288,791
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease									2,106	6,539	211,407	67,088	34,639
Provision for Loan and Lease Losses									26,352	74,618	303,692	178,372	388,058
Interest Expense									36,684	89,364	283,250	204,170	457,222
Business Combination, Acquisition Related Costs									16,322	42,651	20,388
Restructuring Charges										(39)			668
Costs and Expenses									151,905	281,988	1,216,319	788,170	1,169,378
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	145,594	200,649	216,731	181,242	170,115	177,446	144,021	130,236	129,266	90,636	744,216	621,818	353,439
Income Tax Expense (Benefit)									54,633	39,336	281,090	236,291	132,893
Net Income (Loss) Attributable to Parent	90,604	123,948	136,295	112,279	103,664	108,807	95,818	77,238	74,633	51,300	463,126	385,527	220,546
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									76,191	56,583	467,489	376,352	253,515
Parent Company [Member]
Guarantor [Line Items]
Other Income									10,209	8,644	45,349	51,239	29,917
Equity In Income Of Affiliates									92,471	70,729	489,203	404,750	243,078
Revenues									102,680	79,373	534,552	455,989	272,995
Operating Expenses									20,474	18,104	15,166	18,079	17,771
Interest Expense									7,913	11,394	67,178	59,903	45,950
Business Combination, Acquisition Related Costs										6,199
Costs and Expenses									28,387	35,697	82,344	77,982	63,721
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									74,293	43,676	452,208	378,007	209,274
Income Tax Expense (Benefit)									(340)	(7,624)	(10,918)	(7,520)	(11,272)
Net Income (Loss) Attributable to Parent									74,633	51,300	463,126	385,527	220,546
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									76,191	56,583	467,489	376,352
Guarantor Subsidiaries [Member]
Guarantor [Line Items]
Financial Services Revenue									15,402	38,255	149,924	106,857	98,707
Other Income									77,407	80,242	194,451	295,472	392,738
Equity In Income Of Affiliates									88,171	115,397	598,939	488,787	369,120
Revenues									180,980	233,894	943,314	891,116	860,565
Operating Expenses									12,727	4,710	85,424	88,671	65,141
Provision for Loan and Lease Losses									11,797	56,760	231,033	157,923	166,706
Interest Expense									92,388	83,266	166,365	307,329	459,162
Business Combination, Acquisition Related Costs										36,452
Restructuring Charges										15			859
Costs and Expenses									116,912	181,203	482,822	553,923	691,868
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									64,068	52,691	460,492	337,193	168,697
Income Tax Expense (Benefit)									(30,808)	(17,673)	(41,067)	(51,156)	(68,182)
Net Income (Loss) Attributable to Parent									94,876	70,364	501,559	388,349	236,879
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									94,876	70,364	501,559	388,349
Non-Guarantor Subsidiaries [Member]
Guarantor [Line Items]
Financial Services Revenue									248,945	304,094	1,444,250	1,139,830	1,332,612
Operating Leases, Income Statement, Lease Revenue									4,418	15,888	289,256	97,676	44,316
Other Income									134,849	136,244	249,544	509,083	830,046
Equity In Income Of Affiliates
Revenues									388,212	456,226	1,983,050	1,746,589	2,206,974
Operating Expenses									37,240	46,041	296,992	231,790	205,879
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease									2,106	6,539	211,407	67,088	34,639
Provision for Loan and Lease Losses									14,555	17,858	72,659	20,449	221,352
Interest Expense									146,442	205,447	461,946	627,107	1,157,629
Business Combination, Acquisition Related Costs									16,322		20,388
Restructuring Charges										(54)			(191)
Costs and Expenses									216,665	275,831	1,063,392	946,434	1,619,308
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									171,547	180,395	919,658	800,155	587,666
Income Tax Expense (Benefit)									85,781	64,633	333,075	294,967	212,347
Net Income (Loss) Attributable to Parent									85,766	115,762	586,583	505,188	375,319
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									123,764	124,715	592,860	449,794
Consolidation, Eliminations [Member]
Guarantor [Line Items]
Other Income									(210,059)	(210,743)	(412,239)	(790,169)	(1,205,519)
Equity In Income Of Affiliates									(180,642)	(186,126)	(1,088,142)	(893,537)	(612,198)
Revenues									(390,701)	(396,869)	(1,500,381)	(1,683,706)	(1,817,717)
Interest Expense									(210,059)	(210,743)	(412,239)	(790,169)	(1,205,519)
Costs and Expenses									(210,059)	(210,743)	(412,239)	(790,169)	(1,205,519)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									(180,642)	(186,126)	(1,088,142)	(893,537)	(612,198)
Net Income (Loss) Attributable to Parent									(180,642)	(186,126)	(1,088,142)	(893,537)	(612,198)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									$ (218,640)	$ (195,079)	$ (1,094,419)	$ (838,143)