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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
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