Asset-Backed Financing (Assets And Liabilities Of Variable Interest Entities) (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 SPEs [Member]	Dec. 31, 2011 SPEs [Member]	Sep. 25, 2011 SPEs [Member]	Sep. 30, 2012 SPEs Facility [Member]	Dec. 31, 2011 SPEs Facility [Member]	Sep. 25, 2011 SPEs Facility [Member]
Variable Interest Entity [Line Items]
Document Period End Date	Sep. 30, 2012
Line of credit facility, maximum borrowing capacity	$ 600,000,000
Finance receivables		2,466,871,000	2,916,219,000	2,754,409,000	0	13,455,000	16,193,000
Allowance for credit losses		(49,490,000)	(65,735,000)	(64,292,000)	0	(302,000)	(377,000)
Restricted cash		205,760,000	228,776,000	237,030,000	0	879,000	1,178,000
Other assets		5,531,000	6,772,000	7,394,000	542,000	449,000	549,000
Total assets		2,628,672,000	3,086,032,000	2,934,541,000	542,000	14,481,000	17,543,000
Term asset-backed securitization debt		$ 1,692,065,000	$ 2,087,346,000	$ 1,995,073,000