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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | $ 202,800 | $ 185,400 | $ 199,500 | $ 187,400 |
Provision for credit losses | 60,474 | 54,349 | 179,053 | 154,574 |
Credit losses | (55,298) | (50,425) | (177,535) | (158,231) |
Recoveries | 4,024 | 2,776 | 10,982 | 8,357 |
Ending balance | 212,000 | 192,100 | 212,000 | 192,100 |
Net finance receivables | $ 2,053,017 | $ 1,819,756 | $ 2,053,017 | $ 1,819,756 | $ 1,892,535
Allowance as Percentage of Finance Receivables | 10.30% | 10.60% | 10.30% | 10.60% |
Large [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | $ 138,110 | $ 123,978 | $ 133,506 | $ 127,992 |
Provision for credit losses | 35,215 | 34,768 | 105,904 | 94,916 |
Credit losses | (31,332) | (30,493) | (101,727) | (98,161) |
Recoveries | 2,537 | 1,717 | 6,847 | 5,223 |
Ending balance | 144,530 | 129,970 | 144,530 | 129,970 |
Net finance receivables | $ 1,512,140 | $ 1,293,410 | $ 1,512,140 | $ 1,293,410 | 1,336,780
Allowance as Percentage of Finance Receivables | 9.60% | 10.00% | 9.60% | 10.00% |
Small [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance | $ 64,690 | $ 61,422 | $ 65,994 | $ 59,408 |
Provision for credit losses | 25,259 | 19,581 | 73,149 | 59,658 |
Credit losses | (23,966) | (19,932) | (75,808) | (60,070) |
Recoveries | 1,487 | 1,059 | 4,135 | 3,134 |
Ending balance | 67,470 | 62,130 | 67,470 | 62,130 |
Net finance receivables | $ 540,877 | $ 526,346 | $ 540,877 | $ 526,346 | $ 555,755
Allowance as Percentage of Finance Receivables | 12.50% | 11.80% | 12.50% | 11.80% |

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