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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 36,200 $ 36,171 $ 37,452 $ 40,511  
Provision 16,410 14,085 43,587 35,899  
Charge-offs (14,680) (13,158) (45,576) (40,706)  
Recoveries 1,170 688 3,637 2,082  
Balance at end of period 39,100 37,786 39,100 37,786  
Finance receivables $ 696,149 $ 601,608 $ 696,149 $ 601,608 $ 628,444
Allowance as Percentage of Finance Receivable 5.60% 6.30% 5.60% 6.30%  
Small Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 18,752 $ 18,343 $ 21,535 $ 25,280  
Provision 11,103 10,843 29,200 23,284  
Charge-offs (9,722) (9,179) (32,170) (29,401)  
Recoveries 667 402 2,235 1,246  
Balance at end of period 20,800 20,409 20,800 20,409  
Finance receivables $ 349,390 $ 328,207 $ 349,390 $ 328,207 338,157
Allowance as Percentage of Finance Receivable 6.00% 6.20% 6.00% 6.20%  
Large Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 7,886 $ 5,364 $ 5,593 $ 1,980  
Provision 4,209 1,000 9,359 5,271  
Charge-offs (2,436) (715) (5,534) (1,719)  
Recoveries 141 84 382 201  
Balance at end of period 9,800 5,733 9,800 5,733  
Finance receivables $ 217,102 $ 119,731 $ 217,102 $ 119,731 146,553
Allowance as Percentage of Finance Receivable 4.50% 4.80% 4.50% 4.80%  
Automobile Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 7,851 $ 11,121 $ 8,828 $ 11,776  
Provision 308 1,839 3,077 6,273  
Charge-offs (1,976) (2,845) (6,272) (8,303)  
Recoveries 317 178 867 547  
Balance at end of period 6,500 10,293 6,500 10,293  
Finance receivables $ 97,141 $ 128,131 $ 97,141 $ 128,131 116,109
Allowance as Percentage of Finance Receivable 6.70% 8.00% 6.70% 8.00%  
Retail Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 1,711 $ 1,343 $ 1,496 $ 1,475  
Provision 790 403 1,951 1,071  
Charge-offs (546) (419) (1,600) (1,283)  
Recoveries 45 24 153 88  
Balance at end of period 2,000 1,351 2,000 1,351  
Finance receivables $ 32,516 $ 25,539 $ 32,516 $ 25,539 $ 27,625
Allowance as Percentage of Finance Receivable 6.20% 5.30% 6.20% 5.30%