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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Finance Receivables (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables $ 817,463 $ 717,775 $ 628,444
Small Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 375,772 358,471 338,157
Large Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 347,218 235,349 146,553
Automobile Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 61,423 90,432 116,109
Retail Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables $ 33,050 $ 33,523 $ 27,625