Receivables Secured by Property Tax Liens, Net (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Variable Interest Entities [Member]	Dec. 31, 2013 Variable Interest Entities [Member]	May 06, 2014 Texas [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property tax liens, collections from foreclosure, percentage of properties (less than)	0.50%
Receivables secured by tax liens, typical redemption period	84 months
Receivables secured by property tax liens, net	$ 276,081,000	$ 212,814,000	$ 116,980,000	$ 0	$ 141,500,000
Receivable secured by property tax liens, principal amount					$ 134,000,000
Debt instrument, stated interest rate					1.44%