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Long-Term Debt - Schedule of Carrying Amount of the VIE's Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Assets            
Cash $ 2,827   $ 7,654 $ 4,793   $ 4,012
Finance receivables 645,744   628,444 572,525    
Allowance for credit losses (36,200) $ (36,230) (37,452) $ (36,171) $ (36,950) $ (40,511)
Restricted cash 8,237   10,506      
Repossessed assets at net realizable value 488   307      
Total assets 642,803   626,373      
Liabilities            
Net long-term debt 438,862   408,485      
Accounts payable and accrued expenses 10,571   12,661      
Total liabilities 449,879   421,146      
Variable Interest Entity, Primary Beneficiary [Member]            
Assets            
Cash 50   376      
Finance receivables 58,876   80,309      
Allowance for credit losses (2,677)   (2,588)      
Restricted cash 5,335   7,605      
Repossessed assets at net realizable value 203   36      
Total assets 61,787   85,738      
Liabilities            
Net long-term debt 53,122   71,226      
Accounts payable and accrued expenses 15   50      
Total liabilities $ 53,137   $ 71,276