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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Contractual Delinquency of the Finance Receivable Portfolio by Component (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 61,479 $ 53,467  
Past due, Percent 7.50% 7.40%  
Finance receivables $ 817,463 $ 717,775 $ 628,444
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status $ 27,454 $ 25,099  
Finance receivables in nonaccrual status, Percent 3.40% 3.50%  
Financing Receivables, Current [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Current $ 669,451 $ 587,202  
Current, Percent 81.90% 81.90%  
1 to 29 Days Past Due [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 86,533 $ 77,106  
Past due, Percent 10.60% 10.70%  
Delinquent Accounts 30 to 59 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 18,728 $ 16,727  
Past due, Percent 2.20% 2.30%  
Delinquent Accounts 60 to 89 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 15,297 $ 11,641  
Past due, Percent 1.90% 1.60%  
Delinquent Accounts 90 to 119 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 11,339 $ 10,021  
Past due, Percent 1.40% 1.40%  
Delinquent Accounts 120 to 149 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 8,865 $ 8,205  
Past due, Percent 1.10% 1.10%  
Delinquent Accounts 150 to 179 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 7,250 $ 6,873  
Past due, Percent 0.90% 1.00%  
Small Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 35,246 $ 32,955  
Past due, Percent 9.40% 9.20%  
Finance receivables $ 375,772 $ 358,471 338,157
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status $ 16,753 $ 16,437  
Finance receivables in nonaccrual status, Percent 4.50% 4.60%  
Small Loans [Member] | Financing Receivables, Current [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Current $ 301,114 $ 288,983  
Current, Percent 80.10% 80.60%  
Small Loans [Member] | 1 to 29 Days Past Due [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 39,412 $ 36,533  
Past due, Percent 10.50% 10.20%  
Small Loans [Member] | Delinquent Accounts 30 to 59 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 9,738 $ 9,408  
Past due, Percent 2.60% 2.60%  
Small Loans [Member] | Delinquent Accounts 60 to 89 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 8,755 $ 7,110  
Past due, Percent 2.30% 2.00%  
Small Loans [Member] | Delinquent Accounts 90 to 119 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 6,881 $ 6,264  
Past due, Percent 1.90% 1.80%  
Small Loans [Member] | Delinquent Accounts 120 to 149 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 5,284 $ 5,424  
Past due, Percent 1.40% 1.50%  
Small Loans [Member] | Delinquent Accounts 150 to 179 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 4,588 $ 4,749  
Past due, Percent 1.20% 1.30%  
Large Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 18,540 $ 12,114  
Past due, Percent 5.30% 5.10%  
Finance receivables $ 347,218 $ 235,349 146,553
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status $ 7,834 $ 5,246  
Finance receivables in nonaccrual status, Percent 2.30% 2.20%  
Large Loans [Member] | Financing Receivables, Current [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Current $ 299,467 $ 204,063  
Current, Percent 86.30% 86.80%  
Large Loans [Member] | 1 to 29 Days Past Due [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 29,211 $ 19,172  
Past due, Percent 8.40% 8.10%  
Large Loans [Member] | Delinquent Accounts 30 to 59 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 5,949 $ 3,948  
Past due, Percent 1.60% 1.70%  
Large Loans [Member] | Delinquent Accounts 60 to 89 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 4,757 $ 2,920  
Past due, Percent 1.40% 1.20%  
Large Loans [Member] | Delinquent Accounts 90 to 119 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 3,286 $ 2,271  
Past due, Percent 1.00% 1.00%  
Large Loans [Member] | Delinquent Accounts 120 to 149 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 2,537 $ 1,710  
Past due, Percent 0.70% 0.70%  
Large Loans [Member] | Delinquent Accounts 150 to 179 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 2,011 $ 1,265  
Past due, Percent 0.60% 0.50%  
Automobile Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 4,896 $ 6,300  
Past due, Percent 8.00% 7.00%  
Finance receivables $ 61,423 $ 90,432 116,109
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status $ 1,688 $ 2,475  
Finance receivables in nonaccrual status, Percent 2.70% 2.70%  
Automobile Loans [Member] | Financing Receivables, Current [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Current $ 43,140 $ 66,936  
Current, Percent 70.20% 74.00%  
Automobile Loans [Member] | 1 to 29 Days Past Due [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 13,387 $ 17,196  
Past due, Percent 21.80% 19.00%  
Automobile Loans [Member] | Delinquent Accounts 30 to 59 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 2,162 $ 2,654  
Past due, Percent 3.60% 3.00%  
Automobile Loans [Member] | Delinquent Accounts 60 to 89 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 1,046 $ 1,171  
Past due, Percent 1.70% 1.30%  
Automobile Loans [Member] | Delinquent Accounts 90 to 119 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 701 $ 1,110  
Past due, Percent 1.10% 1.20%  
Automobile Loans [Member] | Delinquent Accounts 120 to 149 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 636 $ 743  
Past due, Percent 1.00% 0.80%  
Automobile Loans [Member] | Delinquent Accounts 150 to 179 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 351 $ 622  
Past due, Percent 0.60% 0.70%  
Retail Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 2,797 $ 2,098  
Past due, Percent 8.50% 6.30%  
Finance receivables $ 33,050 $ 33,523 $ 27,625
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status $ 1,179 $ 941  
Finance receivables in nonaccrual status, Percent 3.60% 2.80%  
Retail Loans [Member] | Financing Receivables, Current [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Current $ 25,730 $ 27,220  
Current, Percent 77.80% 81.20%  
Retail Loans [Member] | 1 to 29 Days Past Due [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 4,523 $ 4,205  
Past due, Percent 13.70% 12.50%  
Retail Loans [Member] | Delinquent Accounts 30 to 59 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 879 $ 717  
Past due, Percent 2.70% 2.20%  
Retail Loans [Member] | Delinquent Accounts 60 to 89 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 739 $ 440  
Past due, Percent 2.20% 1.30%  
Retail Loans [Member] | Delinquent Accounts 90 to 119 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 471 $ 376  
Past due, Percent 1.50% 1.10%  
Retail Loans [Member] | Delinquent Accounts 120 to 149 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 408 $ 328  
Past due, Percent 1.20% 1.00%  
Retail Loans [Member] | Delinquent Accounts 150 to 179 Days [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Past due $ 300 $ 237  
Past due, Percent 0.90% 0.70%