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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets      
Interest rate caps $ 98 $ 62 $ 120
Net finance receivables 768,553 676,525  
Repossessed assets 431 502  
Carrying Amount [Member] | Level 1 Inputs [Member]      
Assets      
Cash 5,230 4,446  
Restricted cash 16,787 8,297  
Carrying Amount [Member] | Level 2 Inputs [Member]      
Assets      
Interest rate caps 98 62  
Carrying Amount [Member] | Level 3 Inputs [Member]      
Assets      
Net finance receivables 768,553 676,525  
Repossessed assets 431 502  
Liabilities      
Long-term debt 571,496 491,678  
Estimated Fair Value [Member] | Level 1 Inputs [Member]      
Assets      
Cash 5,230 4,446  
Restricted cash 16,787 8,297  
Estimated Fair Value [Member] | Level 2 Inputs [Member]      
Assets      
Interest rate caps 98 62  
Estimated Fair Value [Member] | Level 3 Inputs [Member]      
Assets      
Net finance receivables 768,553 676,525  
Repossessed assets 431 502  
Liabilities      
Long-term debt $ 571,496 $ 491,678