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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Tabular Disclosure of Impaired Financing Receivables (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | $ 20,381 | $ 17,230 |
Finance receivables evaluated collectively | 826,857 | 800,233 |
Finance receivables | 847,238 | 817,463 | $ 726,767
Impaired receivables in nonaccrual status | 1,686 | 1,798 |
Amount of the specific reserve for impaired accounts | 5,132 | 3,766 |
Amount of the general component of the allowance | 43,318 | 45,144 |
Small Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 6,291 | 5,094 |
Finance receivables evaluated collectively | 378,399 | 370,678 |
Finance receivables | 384,690 | 375,772 | 348,742
Impaired receivables in nonaccrual status | 541 | 707 |
Amount of the specific reserve for impaired accounts | 1,729 | 1,190 |
Amount of the general component of the allowance | 22,240 | 23,559 |
Large Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 12,553 | 10,303 |
Finance receivables evaluated collectively | 379,548 | 336,915 |
Finance receivables | 392,101 | 347,218 | 267,921
Impaired receivables in nonaccrual status | 973 | 931 |
Amount of the specific reserve for impaired accounts | 3,101 | 2,183 |
Amount of the general component of the allowance | 16,597 | 15,365 |
Automobile Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 1,422 | 1,724 |
Finance receivables evaluated collectively | 37,992 | 59,699 |
Finance receivables | 39,414 | 61,423 | 79,861
Impaired receivables in nonaccrual status | 143 | 129 |
Amount of the specific reserve for impaired accounts | 280 | 373 |
Amount of the general component of the allowance | 2,362 | 3,652 |
Retail Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 115 | 109 |
Finance receivables evaluated collectively | 30,918 | 32,941 |
Finance receivables | 31,033 | 33,050 | $ 30,243
Impaired receivables in nonaccrual status | 29 | 31 |
Amount of the specific reserve for impaired accounts | 22 | 20 |
Amount of the general component of the allowance | $ 2,119 | $ 2,568 |

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