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ORGANIZATION AND NATURE OF BUSINESS OPERATIONS (Details) |  | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 03, 2025 USD ($) | Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) segment | Jul. 12, 2025 USD ($) | Jul. 11, 2025 USD ($) transaction | Jun. 30, 2025 USD ($) | Jun. 27, 2025 USD ($) | May 21, 2025 USD ($) | Apr. 07, 2025 USD ($) | Mar. 26, 2025 USD ($) | Feb. 28, 2025
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  | 6 | 6 | 6 |  |  |  |  |  |  |  |
Net (loss) income attributable to B. Riley Financial, Inc. |  | $ (764,274,000) | $ (99,910,000) | $ (159,829,000) |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  | $ 1,530,656,000 | 1,681,151,000 |  |  |  |  |  |  |  |  |
6.375% Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.375% |  |  |  |  |  |  |  |  |  |
6.375% Senior Notes due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  | $ 145,211,000 | 146,432,000 |  |  |  |  |  |  |  |  |
Interest rate |  | 6.375% |  |  |  |  |  |  |  |  |  |
6.50% Senior Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 6.50% |  |  |  |  |  |  |  |  |  |
6.50% Senior Notes due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  | $ 180,464,000 | 180,532,000 |  |  |  |  |  |  |  |  |
5.50% Senior Notes due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  | 216,662,000 | 217,440,000 |  |  |  |  |  |  |  |  |
FRG |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, fair value adjustment |  | (509,954,000) |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, number of private exchange transactions | transaction |  |  |  |  |  | 5 |  |  |  |  |  |
Subsequent Event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 42,838,000 | $ 13,000,000 |  | $ 93,067,000 |  | $ 24,611,000 |
Subsequent Event | 6.375% Senior Notes due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.375%
Subsequent Event | 5.50% Senior Notes due March 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 5.50% |
Debt instrument, face amount, total |  |  |  |  |  |  |  |  |  |  | $ 115,800,000 |
Principal amount |  |  |  |  |  |  |  |  | 29,535,000 |  | $ 86,309,000 |
Subsequent Event | 6.50% Senior Notes due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 6.50% |  |  |  |  | 6.50% |
Debt instrument, face amount, total |  |  |  |  |  |  |  |  |  |  | $ 2,100,000 |
Principal amount |  |  |  |  |  | $ 2,061,000 |  |  |  |  |  |
Subsequent Event | 5.00% Senior Notes due December 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.00% |  |  |  | 5.00% | 5.00% |
Debt instrument, face amount, total |  |  |  |  |  |  | 28,009,000 |  |  |  | $ 146,400,000 |
Principal amount |  |  |  |  |  | $ 19,682,000 | 8,021,000 |  | $ 75,000,000 | $ 22,000,000 | $ 36,745,000 |
Subsequent Event | 6.00% Senior Notes due January 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 6.00% |  |  | 6.00% | 6.00% | 6.00% |
Debt instrument, face amount, total |  |  |  |  |  |  |  |  |  |  | $ 51,100,000 |
Principal amount |  |  |  |  |  | $ 4,706,000 | 1,892,000 |  | $ 34,537,000 |  |  |
Subsequent Event | 5.25% Senior Notes due August 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.25% |  |  |  | 5.25% | 5.25% |
Debt instrument, face amount, total |  |  |  |  |  |  |  |  |  |  | $ 39,500,000 |
Principal amount |  |  |  |  |  | $ 16,389,000 | $ 18,096,000 |  |  | $ 9,992,000 |  |
Subsequent Event | 8.00% Senior Secured Second Lien Notes due 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 8.00% |
Debt instrument, face amount, total |  |  |  |  |  |  |  |  |  |  | $ 228,400,000 |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 87,753,000 |
Subsequent Event | 5.5% Senior Notes due March 31, 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 100,818,000 |  |  |  |  |  |  |
Subsequent Event | 5.50% Senior Notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 5.50% |  |  |  |  |  |  |
Great American Group |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses |  | $ 167,064,000 | $ 0 | $ 0 |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Atlantic Coast Recycling | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration | $ 102,478,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of businesses | $ 68,638,000 |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  | $ 117,800,000 |  |  |  |

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