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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Finance Receivables Evaluated for Impairment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated $ 9,084 $ 7,260  
Finance receivables evaluated collectively 636,660 621,184  
Finance receivables 645,744 628,444 $ 572,525
Impaired receivables in nonaccrual status 539 719  
Amount of the specific reserve for impaired accounts 1,965 1,708  
Amount of the general component of the allowance 34,235 35,744  
Branch Small [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 1,063 524  
Finance receivables evaluated collectively 161,499 157,231  
Finance receivables 162,562 157,755 140,161
Impaired receivables in nonaccrual status 91 109  
Amount of the specific reserve for impaired accounts 250 142  
Amount of the general component of the allowance 9,047 9,314  
Convenience Checks [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 731 485  
Finance receivables evaluated collectively 156,784 179,917  
Finance receivables 157,515 180,402 174,786
Impaired receivables in nonaccrual status 57 95  
Amount of the specific reserve for impaired accounts 176 124  
Amount of the general component of the allowance 9,279 11,955  
Large [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 4,428 2,760  
Finance receivables evaluated collectively 190,429 143,793  
Finance receivables 194,857 146,553 93,203
Impaired receivables in nonaccrual status 195 83  
Amount of the specific reserve for impaired accounts 840 560  
Amount of the general component of the allowance 7,046 5,033  
Automobile [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 2,745 3,370  
Finance receivables evaluated collectively 97,976 112,739  
Finance receivables 100,721 116,109 139,593
Impaired receivables in nonaccrual status 191 415  
Amount of the specific reserve for impaired accounts 678 862  
Amount of the general component of the allowance 7,173 7,966  
Retail [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 117 121  
Finance receivables evaluated collectively 29,972 27,504  
Finance receivables 30,089 27,625 $ 24,782
Impaired receivables in nonaccrual status 5 17  
Amount of the specific reserve for impaired accounts 21 20  
Amount of the general component of the allowance $ 1,690 $ 1,476