Guarantor Consolidating Financial Statements Restatement Tables - Guarantor / Non-Guarantor (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended			3 Months Ended		12 Months Ended			9 Months Ended		9 Months Ended		3 Months Ended		12 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended					3 Months Ended		12 Months Ended			9 Months Ended		9 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	Dec. 31, 2010 Non-Guarantor Subsidiaries [Member]	Sep. 30, 2010 Non-Guarantor Subsidiaries [Member]	Dec. 31, 2012 Non-Guarantor Subsidiaries [Member]	Dec. 31, 2011 Non-Guarantor Subsidiaries [Member]	Jun. 30, 2010 Non-Guarantor Subsidiaries [Member]	Sep. 30, 2011 Non-Guarantor Subsidiaries [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Non-Guarantor Subsidiaries [Member] Scenario, Previously Reported [Member]	Sep. 30, 2011 Non-Guarantor Subsidiaries [Member] Restatement Adjustment [Member]	Dec. 31, 2011 Non-Guarantor Subsidiaries [Member] Restatement Adjustment [Member]	Dec. 31, 2010 Consolidation, Eliminations [Member]	Sep. 30, 2010 Consolidation, Eliminations [Member]	Dec. 31, 2012 Consolidation, Eliminations [Member]	Dec. 31, 2011 Consolidation, Eliminations [Member]	Jun. 30, 2010 Consolidation, Eliminations [Member]	Sep. 30, 2011 Consolidation, Eliminations [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Consolidation, Eliminations [Member] Scenario, Previously Reported [Member]	Sep. 30, 2011 Consolidation, Eliminations [Member] Restatement Adjustment [Member]	Dec. 31, 2011 Consolidation, Eliminations [Member] Restatement Adjustment [Member]	Dec. 31, 2010 Parent Company [Member]	Sep. 30, 2010 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Dec. 31, 2011 Parent Company [Member]	Jun. 30, 2010 Parent Company [Member]	Dec. 31, 2011 Parent Company [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Parent Company [Member] Restatement Adjustment [Member]	Dec. 31, 2010 Guarantor Subsidiaries [Member]	Sep. 30, 2010 Guarantor Subsidiaries [Member]	Dec. 31, 2012 Guarantor Subsidiaries [Member]	Dec. 31, 2011 Guarantor Subsidiaries [Member]	Jun. 30, 2010 Guarantor Subsidiaries [Member]	Sep. 30, 2011 Guarantor Subsidiaries [Member] Scenario, Previously Reported [Member]	Dec. 31, 2011 Guarantor Subsidiaries [Member] Scenario, Previously Reported [Member]	Sep. 30, 2011 Guarantor Subsidiaries [Member] Restatement Adjustment [Member]	Dec. 31, 2011 Guarantor Subsidiaries [Member] Restatement Adjustment [Member]
Financial Services Revenue									$ 264,347	$ 342,349	$ 1,594,174	$ 1,246,687	$ 1,431,319	$ 248,945	$ 304,094	$ 1,444,250	$ 1,139,830	$ 1,332,612	$ 1,161,260		$ 1,139,830																		$ 15,402	$ 38,255	$ 149,924	$ 106,857	$ 98,707	$ 85,427		$ 106,857
Equity In Income Of Affiliates																							(180,642)	(186,126)	(1,088,142)	(893,537)	(612,198)	(906,067)		(893,537)		92,471	70,729	489,203	404,750	243,078			88,171	115,397	598,939	488,787	369,120	501,317		488,787
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	171,547	180,395	919,658	800,155	587,666	821,585		800,155		(180,642)	(186,126)	(1,088,142)	(893,537)	(612,198)	(906,067)		(893,537)		74,293	43,676	452,208	378,007	209,274			64,068	52,691	460,492	337,193	168,697	328,293		337,193
Income Tax Expense (Benefit)									54,633	39,336	281,090	236,291	132,893	85,781	64,633	333,075	294,967	212,347	303,867		294,967											(340)	(7,624)	(10,918)	(7,520)	(11,272)			(30,808)	(17,673)	(41,067)	(51,156)	(68,182)	(60,056)		(51,156)
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	85,766	115,762	586,583	505,188	375,319	517,718		505,188		(180,642)	(186,126)	(1,088,142)	(893,537)	(612,198)	(906,067)		(893,537)		74,633	51,300	463,126	385,527	220,546			94,876	70,364	501,559	388,349	236,879
Financing Receivable, Net	10,998,274				9,162,492						10,998,274	9,162,492				9,440,434	8,603,722			8,960,696		8,603,722																			1,557,840	558,770			201,796		558,770
Due from Affiliates																	2,927,537			2,656,353		2,927,537			(2,063,179)	(3,783,525)			(3,426,131)		(3,783,525)			2,063,179	855,988		769,778	855,988
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures																									(5,466,955)	(8,208,378)			(6,123,604)		(8,208,378)			3,274,348	2,785,146		2,871,356	2,785,146			2,192,607	5,423,232			3,252,248		5,423,232
Assets	16,197,071				13,042,920						16,197,071	13,042,920				12,179,274	13,639,898			13,725,688		13,639,898			(7,530,134)	(11,991,903)			(9,549,735)		(11,991,903)			6,551,020	4,808,704						4,996,911	6,586,221			4,058,263		6,586,221
Due to Affiliate																									(2,063,179)	(3,783,525)			(3,426,131)		(3,783,525)										1,669,061	3,783,525			3,426,131		3,783,525
Liabilities	11,817,844				9,119,882						11,817,844	9,119,882				9,946,854	8,164,496								(2,063,179)	(3,783,525)			(3,426,131)		(3,783,525)			2,171,793	885,666						1,762,376	3,853,245			3,495,851		3,853,245
Additional Paid in Capital, Common Stock	3,459,195				3,470,495						3,459,195	3,470,495				122,425	2,199,694			1,143,529		2,199,694			(201,612)	(2,278,881)			(1,222,716)		(2,278,881)			3,459,195	3,470,495						79,187	79,187
Retained Earnings (Accumulated Deficit)	923,286				460,160						923,286	460,160				1,527,008	2,751,797			3,918,022		2,751,797			(4,693,157)	(5,416,387)			(4,401,247)		(5,416,387)			923,286	460,160						3,166,149	2,664,590
Stockholders' Equity Attributable to Parent	4,379,227				3,923,038						4,379,227	3,923,038				2,232,420	5,475,402			5,561,192		5,475,402			(5,466,955)	(8,208,378)			(6,123,604)		(8,208,378)			4,379,227	3,923,038						3,234,535	2,732,976			562,412		2,732,976
Amortization of Debt Discount (Premium)									(27,458)		(31,648)	(67,671)		(27,416)		(31,648)	(67,488)		146,394		167,824											(42)			(183)									31,172		9,742
Change In Equity In Income Of Affiliates																							180,642	186,126	1,088,142	893,537	612,198		906,067		893,537	(92,471)	(70,729)	(489,203)	(404,750)	(243,078)			(88,171)	(115,397)	(598,939)	(488,787)	(369,120)	(501,317)		(488,787)
Net Cash Provided by (Used in) Operating Activities									191,489	144,742	1,238,333	1,000,892	928,709	159,269	190,746	749,283	629,121	393,797	620,221		629,121											30,933	(49,266)	246,239	252,555	339,824			1,287	3,262	242,811	119,216	195,088	128,116		119,216
Payments to Acquire Receivables																			(5,138,407)		(4,802,863)							5,138,407		4,802,863
Net Proceeds From the Sale of Receivables																							(1,001,126)	(1,155,695)	(4,887,966)	(4,802,863)	(1,606,156)	(5,138,407)		(4,802,863)									1,001,126	1,155,695	4,887,966	4,802,863	1,606,156	5,138,407		4,802,863
Investment in Affiliates - Net Change																							1,788,448	(7,596)	2,738,205	784,551	2,146,356					31,756	2,076		7,186	9,308			(1,820,204)	5,520	(2,738,205)	(791,737)	(2,155,664)
Net Cash Provided by (Used in) Investing Activities									(23,414)	(54,605)	(2,839,606)	(2,140,047)	1,542,224	(71,760)	(232,025)	(1,596,671)	(1,920,077)	1,935,352	(2,255,621)		(1,920,077)		(1,788,448)	7,596	(2,738,205)	(784,551)	(2,146,356)					(29,166)	(2,075)	(45,565)	(5,262)	(9,308)			1,865,960	171,899	1,540,835	569,843	1,762,536	905,387		569,843
Increase (Decrease) Due from Affiliates														(1,842,610)	140,434	(2,219,634)	462,570	(2,209,044)	(118,126)		(462,570)		31,699	51	(25)	(1,504,841)	5,166					(460,668)	(62,897)	1,187,647	652,998	336,411			2,271,579	(77,588)	1,032,012	389,273	1,867,467	(733,717)		(389,273)
Net Cash Provided by (Used in) Financing Activities									(511,180)	165,161	2,317,255	1,520,066	(2,381,655)	(89,750)	43,705	805,070	1,362,451	(2,329,153)	1,706,895		1,362,451		1,790,314	(5,418)	2,744,871	767,434	2,153,711					(3,586)	49,286	(200,674)	(236,312)	(338,746)			(2,208,158)	77,588	(1,032,012)	(373,507)	(1,867,467)	(717,951)		(373,507)
Liabilities and Equity	$ 16,197,071				$ 13,042,920						$ 16,197,071	$ 13,042,920				$ 12,179,274	$ 13,639,898			$ 13,725,688		$ 13,639,898			$ (7,530,134)	$ (11,991,903)			$ (9,549,735)		$ (11,991,903)			$ 6,551,020	$ 4,808,704						$ 4,996,911	$ 6,586,221			$ 4,058,263		$ 6,586,221