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Debt - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Interest rate prime plus 0.25% 0.25%
Debt maturity date Oct. 25, 2013  
Debt interest rate 15.25%  
Debt interest rate payable at option 2.00%  
Secured line of credit $ 362,750 $ 292,379
Significant restrictive covenants 0  
Senior Revolving Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Senior Secured Revolving Credit Facility Maximum Borrowing Amount 500,000 325,000
Line of credit facility, accordion feature 75,000  
Line of credit facility, increased accordion feature 100,000  
Senior Secured Revolving Credit Facility, Basis Spread on Variable Rate 1.00%  
Pays an unused line fee per annum 0.50%  
Decreases unused line fee 0.375%  
Advances on debt agreement eligible finance receivables 85.00%  
Debt agreement expired date May 31, 2016  
Secured line of credit 362,750 292,379
Prime Rate 3.25% 3.25%
Senior Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
   
Line of Credit Facility [Line Items]    
Interest rate prime plus 3.00%  
Senior Secured Revolving Credit Facility, Description of Variable Rate Basis The Company elects between one month and six months, with a LIBOR floor of 1.00%, plus an applicable margin (3.00% as of December 31, 2013) based on its leverage ratio  
Senior Revolving Credit Facility [Member] | Prime Rate [Member]
   
Line of Credit Facility [Line Items]    
Interest rate prime plus 2.00%  
Senior Secured Revolving Credit Facility, Description of Variable Rate Basis The Company may pay interest at a rate based on the prime rate plus an applicable margin (which was 2.00% as of December 31, 2013)  
Collateralized Mortgage Obligations [Member]
   
Line of Credit Facility [Line Items]    
Interest rate prime plus 0.25%  
Debt agreement expired date Jan. 18, 2015  
Secured line of credit 1,500  
Minimum effective interest rate on line of credit 5.00%  
Mezzanine Debt [Member]
   
Line of Credit Facility [Line Items]    
Loan from one of the sponsors $ 25,814