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Long-Term Debt - Schedule of Carrying Amounts of Consolidated VIE's Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets            
Cash $ 2,799   $ 5,230 $ 3,678   $ 4,446
Finance receivables 847,238   817,463 726,767    
Allowance for credit losses (48,450) $ (47,750) (48,910) (42,000) $ (41,000) (41,250)
Restricted cash 26,356   16,787 $ 10,630   $ 8,297
Other assets 17,420   16,012      
Total assets 868,220   829,483      
Liabilities            
Net long-term debt 588,328   566,546      
Accounts payable and accrued expenses 17,526   18,565      
Total liabilities 609,686   590,072      
Variable Interest Entity, Primary Beneficiary [Member]            
Assets            
Cash 120   70      
Finance receivables 232,354   137,239      
Allowance for credit losses (9,929)   (7,129)      
Restricted cash 19,700   10,734      
Other assets 110   119      
Total assets 242,355   141,033      
Liabilities            
Net long-term debt 206,962   116,658      
Accounts payable and accrued expenses 44   53      
Total liabilities $ 207,006   $ 116,711