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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
Dec. 31, 2016
Dec. 31, 2015
Assets    
Interest rate caps $ 62 $ 120
Net finance receivables 676,525 590,992
Carrying Amount [Member] | Level 1 Inputs [Member]    
Assets    
Cash 4,446 7,654
Restricted cash 8,297 10,506
Carrying Amount [Member] | Level 2 Inputs [Member]    
Assets    
Interest rate caps 62 120
Carrying Amount [Member] | Level 3 Inputs [Member]    
Assets    
Net finance receivables 676,525 590,992
Repossessed assets 502 307
Liabilities    
Long-term debt 491,678 411,177
Estimated Fair Value [Member] | Level 1 Inputs [Member]    
Assets    
Cash 4,446 7,654
Restricted cash 8,297 10,506
Estimated Fair Value [Member] | Level 2 Inputs [Member]    
Assets    
Interest rate caps 62 120
Estimated Fair Value [Member] | Level 3 Inputs [Member]    
Assets    
Net finance receivables 676,525 590,992
Repossessed assets 502 307
Liabilities    
Long-term debt $ 491,678 $ 411,177