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Disclosure About Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Assets          
Interest rate caps $ 19 $ 22 $ 120 $ 158 $ 405
Net finance receivables 657,049   590,992    
Estimated Fair Value [Member] | Level 1 Inputs [Member]          
Assets          
Cash 3,959   7,654    
Restricted cash 7,906   10,506    
Estimated Fair Value [Member] | Level 2 Inputs [Member]          
Assets          
Interest rate caps 19   120    
Estimated Fair Value [Member] | Level 3 Inputs [Member]          
Assets          
Net finance receivables 657,049   590,992    
Repossessed assets 429   307    
Liabilities          
Long-term debt 481,766   411,177    
Carrying Amount [Member] | Level 1 Inputs [Member]          
Assets          
Cash 3,959   7,654    
Restricted cash 7,906   10,506    
Carrying Amount [Member] | Level 2 Inputs [Member]          
Assets          
Interest rate caps 19   120    
Carrying Amount [Member] | Level 3 Inputs [Member]          
Assets          
Net finance receivables 657,049   590,992    
Repossessed assets 429   307    
Liabilities          
Long-term debt $ 481,766   $ 411,177