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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Finance Receivables Evaluated for Impairment (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | $ 11,411 | $ 7,260 |
Finance receivables evaluated collectively | 706,364 | 621,184 |
Finance receivables | 717,775 | 628,444 | $ 546,192
Impaired receivables in nonaccrual status | 1,080 | 719 |
Amount of the specific reserve for impaired accounts | 2,374 | 1,708 |
Amount of the general component of the allowance | 38,876 | 35,744 |
Small Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 2,409 | 1,009 |
Finance receivables evaluated collectively | 356,062 | 337,148 |
Finance receivables | 358,471 | 338,157 | 319,533
Impaired receivables in nonaccrual status | 288 | 204 |
Amount of the specific reserve for impaired accounts | 563 | 266 |
Amount of the general component of the allowance | 21,207 | 21,269 |
Large Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 6,441 | 2,760 |
Finance receivables evaluated collectively | 228,908 | 143,793 |
Finance receivables | 235,349 | 146,553 | 46,147
Impaired receivables in nonaccrual status | 610 | 83 |
Amount of the specific reserve for impaired accounts | 1,216 | 560 |
Amount of the general component of the allowance | 10,244 | 5,033 |
Automobile Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 2,460 | 3,370 |
Finance receivables evaluated collectively | 87,972 | 112,739 |
Finance receivables | 90,432 | 116,109 | 154,382
Impaired receivables in nonaccrual status | 175 | 415 |
Amount of the specific reserve for impaired accounts | 576 | 862 |
Amount of the general component of the allowance | 5,334 | 7,966 |
Retail Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Impaired receivables specifically evaluated | 101 | 121 |
Finance receivables evaluated collectively | 33,422 | 27,504 |
Finance receivables | 33,523 | 27,625 | $ 26,130
Impaired receivables in nonaccrual status | 7 | 17 |
Amount of the specific reserve for impaired accounts | 19 | 20 |
Amount of the general component of the allowance | $ 2,091 | $ 1,476 |

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