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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
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Customers in bankruptcy specifically evaluated $ 5,990 $ 6,203  
Finance receivables evaluated collectively 595,618 539,989  
Finance receivables 601,608 546,192 $ 543,353
Accounts in bankruptcy in nonaccrual status 515 1,007  
Amount of the specific reserve for impaired accounts 1,579 1,616  
Amount of the general component of the allowance 36,207 38,895  
Branch Small [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Customers in bankruptcy specifically evaluated 530 582  
Finance receivables evaluated collectively 147,134 127,635  
Finance receivables 147,664 128,217 114,398
Accounts in bankruptcy in nonaccrual status 84 140  
Amount of the specific reserve for impaired accounts 139 143  
Amount of the general component of the allowance 8,430 6,817  
Convenience Checks [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Customers in bankruptcy specifically evaluated 492 544  
Finance receivables evaluated collectively 180,051 190,772  
Finance receivables 180,543 191,316 196,026
Accounts in bankruptcy in nonaccrual status 68 159  
Amount of the specific reserve for impaired accounts 125 165  
Amount of the general component of the allowance 11,715 18,155  
Large [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Customers in bankruptcy specifically evaluated 1,290 1,260  
Finance receivables evaluated collectively 118,441 44,887  
Finance receivables 119,731 46,147 42,177
Accounts in bankruptcy in nonaccrual status 84 133  
Amount of the specific reserve for impaired accounts 374 309  
Amount of the general component of the allowance 5,359 1,671  
Automobile [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Customers in bankruptcy specifically evaluated 3,548 3,698  
Finance receivables evaluated collectively 124,583 150,684  
Finance receivables 128,131 154,382 163,825
Accounts in bankruptcy in nonaccrual status 259 559  
Amount of the specific reserve for impaired accounts 921 981  
Amount of the general component of the allowance 9,372 10,795  
Retail [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Customers in bankruptcy specifically evaluated 130 119  
Finance receivables evaluated collectively 25,409 26,011  
Finance receivables 25,539 26,130 $ 26,927
Accounts in bankruptcy in nonaccrual status 20 16  
Amount of the specific reserve for impaired accounts 20 18  
Amount of the general component of the allowance $ 1,331 $ 1,457