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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period $ 41,250 $ 37,452 $ 40,511  
Provision 77,339 63,014 47,348  
Credit losses (75,880) (64,064) (55,043)  
Recoveries 6,201 4,848 4,636  
Balance at end of period 48,910 41,250 37,452  
Finance receivables $ 817,463 $ 717,775 $ 628,444  
Allowance as Percentage of Finance Receivables 6.00% 5.70% 6.00%  
Small Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period $ 21,770 $ 21,535 $ 25,280  
Provision 45,104 41,119 33,428  
Credit losses (45,612) (43,797) (40,059)  
Recoveries 3,487 2,913 2,886  
Balance at end of period 24,749 21,770 21,535  
Finance receivables $ 375,772 $ 358,471 $ 338,157  
Allowance as Percentage of Finance Receivables 6.60% 6.10% 6.40%  
Large Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period $ 11,460 $ 5,593 $ 1,980  
Provision 25,024 14,261 6,032  
Credit losses (20,088) (8,946) (2,762)  
Recoveries 1,152 552 343  
Balance at end of period 17,548 11,460 5,593  
Finance receivables $ 347,218 $ 235,349 $ 146,553  
Allowance as Percentage of Finance Receivables 5.10% 4.90% 3.80% 4.30%
Automobile Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period $ 5,910 $ 8,828 $ 11,776  
Provision 4,210 4,785 6,285  
Credit losses (7,424) (8,886) (10,466)  
Recoveries 1,329 1,183 1,233  
Balance at end of period 4,025 5,910 8,828  
Finance receivables $ 61,423 $ 90,432 $ 116,109  
Allowance as Percentage of Finance Receivables 6.60% 6.50% 7.60%  
Retail Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period $ 2,110 $ 1,496 $ 1,475  
Provision 3,001 2,849 1,603  
Credit losses (2,756) (2,435) (1,756)  
Recoveries 233 200 174  
Balance at end of period 2,588 2,110 1,496  
Finance receivables $ 33,050 $ 33,523 $ 27,625  
Allowance as Percentage of Finance Receivables 7.80% 6.30% 5.40%