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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 220,900 $ 199,500  
Provision for credit losses 64,868 57,992  
Credit losses (71,161) (61,709)  
Recoveries 4,893 3,317  
Ending balance 219,500 199,100  
Net finance receivables $ 2,104,001 $ 1,890,351 $ 2,140,199
Allowance as Percentage of Finance Receivables 10.40% 10.50%  
Large [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 152,300 $ 133,506  
Provision for credit losses 42,148 34,621  
Credit losses (41,942) (35,755)  
Recoveries 3,094 2,039  
Ending balance 155,600 134,411  
Net finance receivables $ 1,591,528 $ 1,345,825 1,593,171
Allowance as Percentage of Finance Receivables 9.80% 10.00%  
Small [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Beginning balance $ 68,600 $ 65,994  
Provision for credit losses 22,720 23,371  
Credit losses (29,219) (25,954)  
Recoveries 1,799 1,278  
Ending balance 63,900 64,689  
Net finance receivables $ 512,473 $ 544,526 $ 547,028
Allowance as Percentage of Finance Receivables 12.50% 11.90%