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Finance Receivables, Allowance for Credit Losses and Credit Quality Information - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]    
Finance receivable , factors influenced management's decision The methodology for estimating the allowance for credit losses changed from the trailing eight to trailing six month losses on small installment finance receivables, trailing twelve to trailing ten month losses on large installment finance receivables, and trailing twelve to trailing eleven month losses on retail purchase finance receivables  
Reduction in loss allowance $ 3,901  
Increase in Net income 2,452  
Increase in diluted earnings per share $ 0.19  
Offsetting pre-tax increase to the allowance for credit losses for qualitative factors $ 3,450  
Finance receivables 1.30% 1.20%