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Finance Receivables, Allowance for Credit Losses and Credit Quality Information - Summary of Finance Receivables Evaluated for Impairment (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy | $ 2,219 | $ 1,416 |
Customers in Chapter 13 bankruptcy | 5,584 | 5,258 |
Total impaired accounts specifically evaluated | 7,803 | 6,674 |
Finance receivables evaluated collectively | 452,639 | 430,885 |
Finance receivables | 460,442 | 437,559 | 345,411
Accounts in bankruptcy in nonaccrual status | 1,205 | 1,451 |
Amount of the specific reserve for impaired accounts | 4,123 | 3,170 |
Average impaired accounts | 7,559 | 5,984 |
Amount of the general component of the reserve | 21,496 | 20,446 |
Small Installment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy | 1,321 | 725 |
Customers in Chapter 13 bankruptcy | 690 | 420 |
Total impaired accounts specifically evaluated | 2,011 | 1,145 |
Finance receivables evaluated collectively | 204,639 | 187,076 |
Finance receivables | 206,650 | 188,221 | 120,675
Accounts in bankruptcy in nonaccrual status | 183 | 97 |
Amount of the specific reserve for impaired accounts | 1,543 | 854 |
Average impaired accounts | 1,761 | 1,192 |
Amount of the general component of the reserve | 10,756 | 10,515 |
Large Installment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy | 299 | 251 |
Customers in Chapter 13 bankruptcy | 1,601 | 1,696 |
Total impaired accounts specifically evaluated | 1,900 | 1,947 |
Finance receivables evaluated collectively | 42,469 | 50,551 |
Finance receivables | 44,369 | 52,498 | 53,604
Accounts in bankruptcy in nonaccrual status | 400 | 463 |
Amount of the specific reserve for impaired accounts | 853 | 802 |
Average impaired accounts | 1,959 | 1,775 |
Amount of the general component of the reserve | 1,778 | 1,951 |
Automobile Purchase [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy | 468 | 357 |
Customers in Chapter 13 bankruptcy | 3,199 | 3,071 |
Total impaired accounts specifically evaluated | 3,667 | 3,428 |
Finance receivables evaluated collectively | 175,198 | 163,461 |
Finance receivables | 178,865 | 166,889 | 150,292
Accounts in bankruptcy in nonaccrual status | 589 | 858 |
Amount of the specific reserve for impaired accounts | 1,568 | 1,405 |
Average impaired accounts | 3,604 | 2,909 |
Amount of the general component of the reserve | 7,606 | 7,019 |
Retail Purchase [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accounts 180 or more days past due, excluding accounts of customers in bankruptcy | 131 | 83 |
Customers in Chapter 13 bankruptcy | 94 | 71 |
Total impaired accounts specifically evaluated | 225 | 154 |
Finance receivables evaluated collectively | 30,333 | 29,797 |
Finance receivables | 30,558 | 29,951 |
Accounts in bankruptcy in nonaccrual status | 33 | 33 |
Amount of the specific reserve for impaired accounts | 159 | 109 |
Average impaired accounts | 235 | 108 |
Amount of the general component of the reserve | $ 1,356 | $ 961 |

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