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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Finance Receivables (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables $ 847,238 $ 817,463 $ 726,767
Small Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 384,690 375,772 348,742
Large Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 392,101 347,218 267,921
Automobile Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables 39,414 61,423 79,861
Retail Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance receivables $ 31,033 $ 33,050 $ 30,243