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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of TDR Net Finance Receivables And TDR Allowance For Credit Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables $ 1,314,233   $ 1,136,259 $ 1,059,554    
Allowance for credit losses 150,100 $ 139,400 150,000 144,000 $ 142,000 $ 62,200
Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 17,017     22,883    
Allowance for credit losses 5,646     8,371    
Small Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 419,602   403,062 382,785    
Allowance for credit losses 57,786 51,578 59,410 57,016 58,205 30,588
Small Loans [Member] | Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 3,564     6,006    
Allowance for credit losses 1,411     2,403    
Large Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 882,514   715,210 655,932    
Allowance for credit losses 90,422 85,649 87,275 83,002 79,305 29,148
Large Loans [Member] | Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 13,201     16,446    
Allowance for credit losses 4,154     5,775    
Automobile Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 1,757   3,889 4,892    
Allowance for credit losses 319 455 783 995 1,160 820
Automobile Loans [Member] | Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 189     352    
Allowance for credit losses 61     158    
Retail Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 10,360   14,098 15,945    
Allowance for credit losses 1,573 $ 1,718 $ 2,532 2,987 $ 3,330 $ 1,644
Retail Loans [Member] | Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 63     79    
Allowance for credit losses $ 20     $ 35