Allowance for Finance Receivable Losses (Details) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended			9 Months Ended		3 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2012 Adjustment Revision of allowance for finance receivable losses	Sep. 30, 2013 Personal loans	Mar. 31, 2013 Personal loans	Sep. 30, 2012 Personal loans	Sep. 30, 2013 Personal loans	Sep. 30, 2012 Personal loans	Mar. 31, 2013 Personal loans Change in charge-off policy Adjustment	Sep. 30, 2013 Real Estate Loans	Sep. 30, 2012 Real Estate Loans	Sep. 30, 2013 Real Estate Loans	Sep. 30, 2012 Real Estate Loans	Sep. 30, 2013 Real Estate Loans Non-credit impaired finance receivables	Sep. 30, 2012 Real Estate Loans Non-credit impaired finance receivables	Sep. 30, 2013 Real Estate Loans Non-credit impaired finance receivables	Sep. 30, 2012 Real Estate Loans Non-credit impaired finance receivables	Sep. 30, 2013 Real Estate Loans Purchased credit impaired finance receivables	Sep. 30, 2012 Real Estate Loans Purchased credit impaired finance receivables	Sep. 30, 2013 Real Estate Loans Purchased credit impaired finance receivables	Sep. 30, 2012 Real Estate Loans Purchased credit impaired finance receivables	Sep. 30, 2013 Real Estate Loans TDR finance receivables	Sep. 30, 2012 Real Estate Loans TDR finance receivables	Sep. 30, 2013 Real Estate Loans TDR finance receivables	Sep. 30, 2012 Real Estate Loans TDR finance receivables	Sep. 30, 2013 Retail Sales Finance	Sep. 30, 2012 Retail Sales Finance	Sep. 30, 2013 Retail Sales Finance	Sep. 30, 2012 Retail Sales Finance
Changes in the allowance for finance receivable losses by finance receivable type
Balance at beginning of period	$ 245,610,000	$ 91,673,000	$ 180,136,000	$ 72,000,000			$ 60,250,000	$ 66,580,000	$ 41,431,000	$ 66,580,000	$ 39,522,000		$ 184,440,000	$ 49,051,000	$ 111,296,000	$ 31,471,000													$ 920,000	$ 1,191,000	$ 2,260,000	$ 1,007,000
Provision for finance receivable losses	97,414,000	90,836,000	262,142,000	227,430,000			39,685,000		29,010,000	64,282,000	69,731,000		55,886,000	59,308,000	202,094,000	148,509,000	17,808,000	19,501,000	62,968,000	69,924,000	21,210,000	18,015,000	60,511,000	37,365,000	16,868,000	21,792,000	78,615,000	41,220,000	1,843,000	2,518,000	(4,234,000)	9,190,000
Charge-offs	(67,292,000)	(62,278,000)	(233,560,000)	(205,505,000)			(32,527,000)	(13,300,000)	(26,797,000)	(106,161,000)	(82,035,000)	(13,300,000)	(32,733,000)	(31,432,000)	(120,061,000)	(107,496,000)													(2,032,000)	(4,049,000)	(7,338,000)	(15,974,000)
Recoveries	3,753,000	12,837,000	70,767,000	40,444,000			2,135,000		7,865,000	44,842,000	25,398,000		1,324,000	2,545,000	15,588,000	6,988,000													294,000	2,427,000	10,337,000	8,058,000
Transfers to finance receivables held for sale				(1,301,000)							(1,107,000)																					(194,000)
Balance at end of period	279,485,000	133,068,000	279,485,000	133,068,000			69,543,000		51,509,000	69,543,000	51,509,000		208,917,000	79,472,000	208,917,000	79,472,000													1,025,000	2,087,000	1,025,000	2,087,000
Number of days past due before which a loan is charged off to the allowance for finance receivable losses												180 days
Minimum percentage of original loan amount to be received before charge-off (as a percent)								0.05
Recoveries resulting from sale of previously charged-off finance receivables			41,200,000							25,400,000					9,900,000																5,900,000
Transfers to finance receivables held for sale which have a specific allowance			77,800,000
Amount of allowance for finance receivable losses associated with securitizations	87,800,000		87,800,000		14,700,000	4,700,000
Carrying value charged-off for purchased credit impaired loans
Purchased credit impaired finance receivables													$ 9,873,000	$ 9,362,000	$ 31,501,000	$ 28,712,000