VIE and Other Finance Receivables, at Fair Market Value (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
VIE and other finance receivables, at fair market value
Maturity value	$ 6,054,437,000			$ 5,917,596,000
Unearned income	(1,994,305,000)			(2,046,947,000)
Total VIE finance receivables at fair value	4,017,985,000	[1]		3,818,704,000	[1]
Not encumbered	42,147,000			51,945,000
Total VIE and other finance receivables at fair value	4,060,132,000			3,870,649,000
Servicing fees	231,000		241,000
Variable funding note facility
VIE and other finance receivables, at fair market value
Total VIE finance receivables at fair value	21,305,000			11,073,000
Maximum borrowing capacity	100,000,000			100,000,000
Multi-tranche and lender credit facility
VIE and other finance receivables, at fair market value
Total VIE finance receivables at fair value	12,424,000			16,681,000
Maximum borrowing capacity	300,000,000			300,000,000
Permanent financing related to 2011-A
VIE and other finance receivables, at fair market value
Total VIE finance receivables at fair value	47,019,000			41,164,000
Maximum borrowing capacity	100,000,000			100,000,000
VIE securitization debt
VIE and other finance receivables, at fair market value
Total VIE finance receivables at fair value	3,916,681,000			3,742,218,000
JGW IV | Credit facility
VIE and other finance receivables, at fair market value
Maximum borrowing capacity	50,000,000			50,000,000
JGW VII, LLC | Credit facility
VIE and other finance receivables, at fair market value
Total VIE finance receivables at fair value	20,556,000			7,568,000
Maximum borrowing capacity	$ 300,000,000			$ 300,000,000

[1] Pledged as collateral to credit and long-term debt facilities