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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Finance Receivables (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables $ 912,250 $ 932,243 $ 804,956
Small Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 421,712 437,662 360,470
Large Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 440,707 437,998 363,931
Automobile Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 20,511 26,154 48,704
Retail Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables $ 29,320 $ 30,429 $ 31,851