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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
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

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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