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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Reconciliation of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 178,800 $ 159,300  
Provision for credit losses 47,668 30,858  
Credit losses (44,609) (32,780)  
Recoveries 1,941 1,422  
Ending balance 183,800 158,800  
Net finance receivables $ 1,676,230 $ 1,446,071 $ 1,699,393
Allowance as Percentage of Finance Receivables 11.00% 11.00%  
Small [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 57,915 $ 61,294  
Provision for credit losses 19,819 12,646  
Credit losses (16,380) (16,255)  
Recoveries 758 645  
Ending balance 62,112 58,330  
Net finance receivables $ 456,313 $ 438,153 481,605
Allowance as Percentage of Finance Receivables 13.60% 13.30%  
Large [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 119,592 $ 96,494  
Provision for credit losses 27,709 17,952  
Credit losses (28,097) (16,260)  
Recoveries 1,178 747  
Ending balance 120,382 98,933  
Net finance receivables $ 1,211,836 $ 997,226 1,208,185
Allowance as Percentage of Finance Receivables 9.90% 9.90%  
Retail [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 1,293 $ 1,512  
Provision for credit losses 140 260  
Credit losses (132) (265)  
Recoveries 5 30  
Ending balance 1,306 1,537  
Net finance receivables $ 8,081 $ 10,692 $ 9,603
Allowance as Percentage of Finance Receivables 16.20% 14.40%