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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
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables $ 1,183,387   $ 1,136,259 $ 1,022,635    
Allowance for credit losses 139,400 $ 139,600 150,000 142,000 $ 142,400 $ 62,200
Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 17,576     25,474    
Allowance for credit losses 5,969     9,185    
Small Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 380,780   403,062 380,083    
Allowance for credit losses 51,578 53,673 59,410 58,205 62,454 30,588
Small Loans [Member] | Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 3,844     7,162    
Allowance for credit losses 1,576     2,883    
Large Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 789,743   715,210 618,134    
Allowance for credit losses 85,649 83,345 87,275 79,305 75,013 29,148
Large Loans [Member] | Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 13,441     17,825    
Allowance for credit losses 4,278     6,085    
Automobile Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 2,303   3,889 6,059    
Allowance for credit losses 455 604 783 1,160 1,247 820
Automobile Loans [Member] | Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 224     402    
Allowance for credit losses 88     179    
Retail Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 10,561   14,098 18,359    
Allowance for credit losses 1,718 $ 1,978 $ 2,532 3,330 $ 3,686 $ 1,644
Retail Loans [Member] | Troubled Debt Restructurings            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net finance receivables 67     85    
Allowance for credit losses $ 27     $ 38