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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