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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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