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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Tabular Disclosure of Impaired Financing Receivables (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated $ 26,585 $ 17,230  
Finance receivables evaluated collectively 905,658 800,233  
Finance receivables 932,243 817,463 $ 717,775
Impaired receivables in nonaccrual status 3,716 1,798  
Amount of the specific reserve for impaired accounts 11,204 3,766  
Amount of the general component of the allowance 47,096 45,144  
Small Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 8,361 5,094  
Finance receivables evaluated collectively 429,301 370,678  
Finance receivables 437,662 375,772 358,471
Impaired receivables in nonaccrual status 1,209 707  
Amount of the specific reserve for impaired accounts 3,791 1,190  
Amount of the general component of the allowance 26,968 23,559  
Large Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 17,196 10,303  
Finance receivables evaluated collectively 420,802 336,915  
Finance receivables 437,998 347,218 235,349
Impaired receivables in nonaccrual status 2,292 931  
Amount of the specific reserve for impaired accounts 6,860 2,183  
Amount of the general component of the allowance 16,842 15,365  
Automobile Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 918 1,724  
Finance receivables evaluated collectively 25,236 59,699  
Finance receivables 26,154 61,423 90,432
Impaired receivables in nonaccrual status 178 129  
Amount of the specific reserve for impaired accounts 492 373  
Amount of the general component of the allowance 1,401 3,652  
Retail Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired receivables specifically evaluated 110 109  
Finance receivables evaluated collectively 30,319 32,941  
Finance receivables 30,429 33,050 $ 33,523
Impaired receivables in nonaccrual status 37 31  
Amount of the specific reserve for impaired accounts 61 20  
Amount of the general component of the allowance $ 1,885 $ 2,568