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Finance Receivables, Allowance for Credit Losses and Credit Quality Information - Summary of Finance Receivables (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] |  |  |
Finance receivables | $ 460,442 | $ 437,559 | $ 345,411
Small Installment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Finance receivables | 206,650 | 188,221 | 120,675
Large Installment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Finance receivables | 44,369 | 52,498 | 53,604
Automobile Purchase [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Finance receivables | 178,865 | 166,889 | 150,292
Retail Purchase Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Finance receivables | $ 30,558 | $ 29,951 | $ 20,840

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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