Commitments and Contingencies - Additional Information (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended			1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 July 2015	Jun. 30, 2014 July 2017	Jun. 30, 2014 CBP	Jun. 30, 2013 SBNA	Jun. 30, 2014 SBNA	Dec. 31, 2013 SBNA
Contingencies And Commitments [Line Items]
Repurchase of outstanding	$ 0		$ 0
Letter of credit facility			500,000,000		500,000,000
Letter of credit facility issued	0		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	300,000,000		300,000,000
Commitment to sell loans maturity Period			May 31, 2018
Loans servicing, loss-sharing payment ratio								0.50%
Referral fee									9,000,000
Loan										456,006,000	202,494,000
Servicing fees adjustment	1,329,000	0	3,249,000	0
Indemnification of leases										48,226,000
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						$ 30,000,000	$ 30,000,000
Purchase commitment percent						75.00%	50.00%
Purchase commitment notice period			90 days