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Long-Term Debt - Schedule of Carrying Amount of the VIE's Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Assets            
Cash $ 3,959   $ 7,654 $ 4,922   $ 4,012
Finance receivables 696,149   628,444 601,608    
Allowance for credit losses (39,100) $ (36,200) (37,452) $ (37,786) $ (36,171) $ (40,511)
Restricted cash 7,906   10,506      
Repossessed assets at net realizable value 429   307      
Other assets 5,961   2,860      
Total assets 691,329   626,373      
Liabilities            
Net long-term debt 479,363   408,485      
Accounts payable and accrued expenses 11,436   12,661      
Total liabilities 491,231   421,146      
Variable Interest Entity, Primary Beneficiary [Member]            
Assets            
Cash 41   376      
Finance receivables 49,608   80,309      
Allowance for credit losses (2,976)   (2,588)      
Restricted cash 4,786   7,605      
Repossessed assets at net realizable value 142   36      
Other assets 10          
Total assets 51,611   85,738      
Liabilities            
Net long-term debt 45,205   71,226      
Accounts payable and accrued expenses 4   50      
Total liabilities $ 45,209   $ 71,276