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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
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets            
Interest rate caps $ 718 $ 219 $ 98 $ 113 $ 27 $ 62
Net finance receivables 798,788   768,553      
Carrying Amount [Member] | Level 1 Inputs [Member]            
Assets            
Cash 2,799   5,230      
Restricted cash 26,356   16,787      
Carrying Amount [Member] | Level 2 Inputs [Member]            
Assets            
Interest rate caps 718   98      
Carrying Amount [Member] | Level 3 Inputs [Member]            
Assets            
Net finance receivables 798,788   768,553      
Repossessed assets 208   431      
Liabilities            
Long-term debt 595,765   571,496      
Estimated Fair Value [Member] | Level 1 Inputs [Member]            
Assets            
Cash 2,799   5,230      
Restricted cash 26,356   16,787      
Estimated Fair Value [Member] | Level 2 Inputs [Member]            
Assets            
Interest rate caps 718   98      
Estimated Fair Value [Member] | Level 3 Inputs [Member]            
Assets            
Net finance receivables 798,788   768,553      
Repossessed assets 208   431      
Liabilities            
Long-term debt $ 595,765   $ 571,496