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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
Mar. 31, 2019
Dec. 31, 2018
Assets    
Net finance receivables $ 855,850 $ 873,943
Carrying Amount [Member] | Level 1 Inputs [Member]    
Assets    
Cash 2,331 3,657
Restricted cash 38,917 46,484
Carrying Amount [Member] | Level 2 Inputs [Member]    
Assets    
Interest rate caps 49 249
Carrying Amount [Member] | Level 3 Inputs [Member]    
Assets    
Net finance receivables 855,850 873,943
Repossessed assets 142 124
Liabilities    
Long-term debt 628,786 660,507
Estimated Fair Value [Member] | Level 1 Inputs [Member]    
Assets    
Cash 2,331 3,657
Restricted cash 38,917 46,484
Estimated Fair Value [Member] | Level 2 Inputs [Member]    
Assets    
Interest rate caps 49 249
Estimated Fair Value [Member] | Level 3 Inputs [Member]    
Assets    
Net finance receivables 855,850 873,943
Repossessed assets 142 124
Liabilities    
Long-term debt $ 628,786 $ 660,507