Commitments and Contingencies - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended		3 Months Ended		1 Months Ended	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014 July Two Thousand Fifteen	Mar. 31, 2014 July Two Thousand Seventeen	Jun. 30, 2013 SBNA	Mar. 31, 2014 SBNA	Dec. 31, 2013 SBNA
Contingencies And Commitments [Line Items]
Repurchase of outstanding	$ 0
Letter of credit facility	500,000	500,000
Letter of credit facility issued	0	0
Expiration of letter of credit facility commitments	Dec. 31, 2014
Unsecured revolving financing Initial term ending	Apr. 30, 2020
Commitment to sell loans	300,000
Commitment to sell loans maturity Period	May 31, 2018
Referral fee						9,000
Loan							347,247	202,494
Periodic retroactive adjustment	1,920		0
Indemnification of Leases							36,187
Purchase commitment	Under terms of the new agreements, the Company has committed to purchase at least the lesser of $30,000 per month or 75% of the lending platform company’s near-prime originations through July 2015, and the lesser of $30,000 per month or 50% of the lending platform company’s near-prime originations thereafter through July 2017.
Purchase commitment amount				$ 30,000	$ 30,000
Purchase commitment percent				75.00%	50.00%
Purchase commitment notice period	90 days