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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Rating | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net finance receivables included net deferred origination fees | $ 14.7 |  | $ 14.7 |  | $ 15.7
Number of FICO band categories | Rating |  |  | 6 |  |
Accrued interest reversed as a reduction of interest and fee income | $ 6.3 | $ 5.7 | $ 20.7 | $ 17.3 |

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