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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Tabular Disclosure of Impaired Financing Receivables (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | $ 17,230 | $ 11,411 |
Finance receivables evaluated collectively | 800,233 | 706,364 |
Finance receivables | 817,463 | 717,775 | $ 628,444
Impaired receivables in nonaccrual status | 1,798 | 1,080 |
Amount of the specific reserve for impaired accounts | 3,766 | 2,374 |
Amount of the general component of the allowance | 45,144 | 38,876 |
Small Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 5,094 | 2,409 |
Finance receivables evaluated collectively | 370,678 | 356,062 |
Finance receivables | 375,772 | 358,471 | 338,157
Impaired receivables in nonaccrual status | 707 | 288 |
Amount of the specific reserve for impaired accounts | 1,190 | 563 |
Amount of the general component of the allowance | 23,559 | 21,207 |
Large Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 10,303 | 6,441 |
Finance receivables evaluated collectively | 336,915 | 228,908 |
Finance receivables | 347,218 | 235,349 | 146,553
Impaired receivables in nonaccrual status | 931 | 610 |
Amount of the specific reserve for impaired accounts | 2,183 | 1,216 |
Amount of the general component of the allowance | 15,365 | 10,244 |
Automobile Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 1,724 | 2,460 |
Finance receivables evaluated collectively | 59,699 | 87,972 |
Finance receivables | 61,423 | 90,432 | 116,109
Impaired receivables in nonaccrual status | 129 | 175 |
Amount of the specific reserve for impaired accounts | 373 | 576 |
Amount of the general component of the allowance | 3,652 | 5,334 |
Retail Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 109 | 101 |
Finance receivables evaluated collectively | 32,941 | 33,422 |
Finance receivables | 33,050 | 33,523 | $ 27,625
Impaired receivables in nonaccrual status | 31 | 7 |
Amount of the specific reserve for impaired accounts | 20 | 19 |
Amount of the general component of the allowance | $ 2,568 | $ 2,091 |

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