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Subsequent Events - Additional Information (Detail) - USD ($) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Nov. 30, 2025 | Oct. 31, 2025 | Feb. 28, 2021 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Subsequent Event [Line Items] |  |  |  |  |  |
Advances on securitizations |  |  |  | $ 265,000,000 | $ 187,305,000 |
Amount authorized under stock repurchase program |  |  |  |  |  | $ 30,000,000
Stock repurchase program expiration date |  |  |  | Dec. 31, 2026 |  |
RMIT 2021-1 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Advances on securitizations |  |  | $ 249,000,000 |  |  |
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Amount authorized under stock repurchase program | $ 60,000,000 |  |  |  |  |
Increase in stock repurchase program, authorized, amount | $ 30,000,000 |  |  |  |  |
Stock repurchase program expiration date | Jun. 30, 2027 |  |  |  |  |
Subsequent Event | RMIT 2025-2 |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Advances on securitizations |  | $ 253,000,000 |  |  |  |
Subsequent Event | Quarterly Cash Dividend |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Cash dividend per share | $ 0.3 |  |  |  |  |
Dividends payable, date to be paid | Dec. 16, 2025 |  |  |  |  |
Dividend date of record | Nov. 25, 2025 |  |  |  |  |
Dividend date of declaration | 2025-11 |  |  |  |  |

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- Definition Increase in share repurchase program, authorized, amount. + References No definition available. + Details
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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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- Definition Expiration date for purchase of share under share repurchase plan, in YYYY-MM-DD format. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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- Definition Date the declared dividend will be paid, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 + Details
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- Definition The month and year (YYYY-MM) that the dividend to be paid was declared. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format. + References No definition available. + Details
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- Definition Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483399/855-10-50-2 + Details
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