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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 47,750 $ 41,000 $ 48,910 $ 41,250  
Provision 20,203 18,589 39,718 37,723  
Credit losses (20,666) (19,003) (42,686) (39,997)  
Recoveries 1,163 1,414 2,508 3,024  
Balance at end of period 48,450 42,000 48,450 42,000  
Finance receivables $ 847,238 $ 726,767 $ 847,238 $ 726,767 $ 817,463
Allowance as Percentage of Finance Receivables 5.70% 5.80% 5.70% 5.80%  
Small Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 23,366 $ 20,575 $ 24,749 $ 21,770  
Provision 12,720 11,082 24,003 22,245  
Credit losses (12,782) (11,542) (26,156) (24,744)  
Recoveries 665 795 1,373 1,639  
Balance at end of period 23,969 20,910 23,969 20,910  
Finance receivables $ 384,690 $ 348,742 $ 384,690 $ 348,742 375,772
Allowance as Percentage of Finance Receivables 6.20% 6.00% 6.20% 6.00%  
Large Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 18,589 $ 12,675 $ 17,548 $ 11,460  
Provision 6,784 6,124 13,663 11,727  
Credit losses (6,002) (5,023) (12,198) (9,652)  
Recoveries 327 224 685 465  
Balance at end of period 19,698 14,000 19,698 14,000  
Finance receivables $ 392,101 $ 267,921 $ 392,101 $ 267,921 347,218
Allowance as Percentage of Finance Receivables 5.00% 5.20% 5.00% 5.20%  
Automobile Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 3,316 $ 5,775 $ 4,025 $ 5,910  
Provision 64 825 585 2,563  
Credit losses (873) (1,724) (2,340) (4,056)  
Recoveries 135 334 372 793  
Balance at end of period 2,642 5,210 2,642 5,210  
Finance receivables $ 39,414 $ 79,861 $ 39,414 $ 79,861 61,423
Allowance as Percentage of Finance Receivables 6.70% 6.50% 6.70% 6.50%  
Retail Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance at beginning of period $ 2,479 $ 1,975 $ 2,588 $ 2,110  
Provision 635 558 1,467 1,188  
Credit losses (1,009) (714) (1,992) (1,545)  
Recoveries 36 61 78 127  
Balance at end of period 2,141 1,880 2,141 1,880  
Finance receivables $ 31,033 $ 30,243 $ 31,033 $ 30,243 $ 33,050
Allowance as Percentage of Finance Receivables 6.90% 6.20% 6.90% 6.20%