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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, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Assets        
Interest rate caps $ 22 $ 108 $ 120 $ 405
Net finance receivables 609,544   590,992  
Estimated Fair Value [Member] | Level 1 Inputs [Member]        
Assets        
Cash 2,827   7,654  
Restricted cash 8,237   10,506  
Estimated Fair Value [Member] | Level 2 Inputs [Member]        
Assets        
Interest rate caps 22   120  
Estimated Fair Value [Member] | Level 3 Inputs [Member]        
Assets        
Net finance receivables 609,544   590,992  
Repossessed assets 488   307  
Liabilities        
Long-term debt 441,147   411,177  
Carrying Amount [Member] | Level 1 Inputs [Member]        
Assets        
Cash 2,827   7,654  
Restricted cash 8,237   10,506  
Carrying Amount [Member] | Level 2 Inputs [Member]        
Assets        
Interest rate caps 22   120  
Carrying Amount [Member] | Level 3 Inputs [Member]        
Assets        
Net finance receivables 609,544   590,992  
Repossessed assets 488   307  
Liabilities        
Long-term debt $ 441,147   $ 411,177