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Finance Receivables, Allowance for Credit Losses and Credit Quality Information - Assessment of Credit Quality 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]      
Current $ 346,731 $ 327,800  
Current, Percent 75.30% 74.90%  
1 to 29 days delinquent 84,880 80,224  
1 to 29 days delinquent, Percent 18.40% 18.30%  
Delinquent accounts      
30 to 59 days 12,513 12,386  
30 to 59 days, Percent 2.70% 2.90%  
60 to 89 days 5,783 6,049  
60 to 89 days, Percent 1.30% 1.40%  
90 days and over 10,535 11,100  
90 days and over, Percent 2.30% 2.50%  
Total delinquency 28,831 29,535  
Total delinquency, Percent 6.30% 6.80%  
Finance receivables 460,442 437,559 345,411
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status 10,535 11,100  
Finance receivables in nonaccrual status, Percent 2.30% 2.50%  
Small Installment [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 165,076 149,232  
Current, Percent 79.90% 79.30%  
1 to 29 days delinquent 28,095 25,285  
1 to 29 days delinquent, Percent 13.60% 13.40%  
Delinquent accounts      
30 to 59 days 4,914 4,514  
30 to 59 days, Percent 2.40% 2.40%  
60 to 89 days 2,694 2,996  
60 to 89 days, Percent 1.30% 1.60%  
90 days and over 5,871 6,194  
90 days and over, Percent 2.80% 3.30%  
Total delinquency 13,479 13,704  
Total delinquency, Percent 6.50% 7.30%  
Finance receivables 206,650 188,221 120,675
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status 5,871 6,194  
Finance receivables in nonaccrual status, Percent 2.80% 3.30%  
Large Installment [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 32,321 38,191  
Current, Percent 72.90% 72.70%  
1 to 29 days delinquent 8,526 10,122  
1 to 29 days delinquent, Percent 19.20% 19.30%  
Delinquent accounts      
30 to 59 days 1,405 1,718  
30 to 59 days, Percent 3.20% 3.30%  
60 to 89 days 645 785  
60 to 89 days, Percent 1.40% 1.50%  
90 days and over 1,472 1,682  
90 days and over, Percent 3.30% 3.20%  
Total delinquency 3,522 4,185  
Total delinquency, Percent 7.90% 8.00%  
Finance receivables 44,369 52,498 53,604
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status 1,472 1,682  
Finance receivables in nonaccrual status, Percent 3.30% 3.20%  
Automobile Purchase [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 125,085 116,513  
Current, Percent 69.90% 69.90%  
1 to 29 days delinquent 43,781 40,456  
1 to 29 days delinquent, Percent 24.50% 24.20%  
Delinquent accounts      
30 to 59 days 5,502 5,403  
30 to 59 days, Percent 3.10% 3.20%  
60 to 89 days 2,017 1,935  
60 to 89 days, Percent 1.10% 1.20%  
90 days and over 2,480 2,582  
90 days and over, Percent 1.40% 1.50%  
Total delinquency 9,999 9,920  
Total delinquency, Percent 5.60% 5.90%  
Finance receivables 178,865 166,889 150,292
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status 2,480 2,582  
Finance receivables in nonaccrual status, Percent 1.40% 1.50%  
Retail Purchase [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 24,249 23,864  
Current, Percent 79.40% 79.70%  
1 to 29 days delinquent 4,478 4,361  
1 to 29 days delinquent, Percent 14.60% 14.60%  
Delinquent accounts      
30 to 59 days 692 751  
30 to 59 days, Percent 2.30% 2.50%  
60 to 89 days 427 333  
60 to 89 days, Percent 1.40% 1.10%  
90 days and over 712 642  
90 days and over, Percent 2.30% 2.10%  
Total delinquency 1,831 1,726  
Total delinquency, Percent 6.00% 5.70%  
Finance receivables 30,558 29,951  
Total finance receivables, Percent 100.00% 100.00%  
Finance receivables in nonaccrual status $ 712 $ 642  
Finance receivables in nonaccrual status, Percent 2.30% 2.10%