Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 112,279	$ 77,238
Cash flows from investing activities:
Purchases of receivables	(1,364,662)	(1,134,782)
Principal collections and recoveries on receivables	1,015,918	954,291
Purchases of leased vehicles	(305,370)	(320,206)
Proceeds from termination of leased vehicles	6,922	12,880
Purchases of property and equipment	(3,952)	11
Change in restricted cash - securitization notes payable	62,710	(77,373)
Change in restricted cash - credit facilities	15,452	(19,693)
Change in other assets	10,079	(13,831)
Net cash (used) provided by investing activities	(562,903)	(598,703)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	50,565	17,868
Accretion and amortization of loan and leasing fees	11,087	2,936
Amortization of finance receivables premium	20,169	67,927
Amortization of debt discount	(9,944)	(23,117)
Provision for loan losses	48,554	39,424
Deferred income taxes	(9,652)	(21,789)
Stock-based compensation expense	584	2,925
Other	(5,556)	(8,844)
Changes in assets and liabilities:
Other assets	1,943	(11,521)
Accounts payable and accrued expenses	25,674	(12,765)
Taxes payable	4,108	17,117
Intercompany taxes payable	72,378	54,817
Cash flows from financing activities:
Borrowings on credit facilities	453,774	1,196,521
Payments on credit facilities	(778,054)	(615,510)
Issuance of securitization notes payable	1,800,000	800,000
Payments on securitization notes payable	(1,168,700)	(845,058)
Debt issuance costs	(4,761)	(17,809)
Net cash provided (used) by financing activities	302,259	518,144
Net cash provided by operating activities	296,129	219,386
Net increase (decrease) in cash and cash equivalents	35,485	138,827
Effect of Canadian exchange rate changes on cash and cash equivalents	1,009	(198)
Cash and cash equivalents at beginning of period	572,297	194,554
Cash and cash equivalents at end of period	$ 608,791