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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
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net finance receivables $ 1,676,230 $ 1,699,393 $ 1,446,071  
TDR Allowance for Credit Losses 183,800 178,800 158,800 $ 159,300
Troubled Debt Restructurings [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net finance receivables     16,602  
TDR Allowance for Credit Losses     4,879  
Small Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net finance receivables 456,313 481,605 438,153  
TDR Allowance for Credit Losses 62,112 57,915 58,330 61,294
Small Loans [Member] | Troubled Debt Restructurings [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net finance receivables     3,249  
TDR Allowance for Credit Losses     1,078  
Large Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net finance receivables 1,211,836 1,208,185 997,226  
TDR Allowance for Credit Losses 120,382 119,592 98,933 96,494
Large Loans [Member] | Troubled Debt Restructurings [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net finance receivables     13,295  
TDR Allowance for Credit Losses     3,782  
Retail Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net finance receivables 8,081 9,603 10,692  
TDR Allowance for Credit Losses $ 1,306 $ 1,293 1,537 $ 1,512
Retail Loans [Member] | Troubled Debt Restructurings [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net finance receivables     58  
TDR Allowance for Credit Losses     $ 19