BUSINESS SEGMENTS - Schedule of reportable segments (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 199,305	$ 363,268	$ 637,222	$ 1,151,943
Direct cost of services	(49,659)	(52,616)	(168,008)	(156,373)
Cost of goods sold	(40,312)	(42,217)	(118,897)	(129,490)
Selling, general and administrative expenses	(184,605)	(202,321)	(577,377)	(579,964)
Interest expense - Securities lending and loan participations sold	(6,359)	(38,368)	(65,055)	(106,572)
Depreciation and amortization			(34,127)	(38,102)
Restructuring charge	(116)	(228)	(925)	(949)
Impairment of goodwill and tradenames	0	(35,500)	(27,681)	(37,233)
Operating (loss) income	(81,746)	(7,982)	(320,721)	141,362
Interest income	1,438	180	2,909	3,455
Dividend income	675	3,373	4,139	9,541
Realized and unrealized (losses) gains on investments	(22,197)	(77,287)	(212,362)	(77,020)
Change in fair value of financial instruments and other	476	(4,170)	627	(3,998)
Income (loss) from equity investments	6	(308)	12	(175)
Interest expense	(32,996)	(37,493)	(102,195)	(118,630)
Loss from continuing operations before income taxes	(134,344)	(123,687)	(627,591)	(45,465)
(Provision for) benefit from income taxes	(14,508)	23,638	(17,915)	(3,045)
Income (loss) from continuing operations	(148,852)	(100,049)	(645,506)	(48,510)
(Loss) income from discontinued operations, net of income taxes	(138,746)	23,741	(123,827)	32,543
Net loss	(287,598)	(76,308)	(769,333)	(15,967)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(3,201)	(2,485)	(2,167)	(5,680)
Net loss attributable to B. Riley Financial, Inc.	(284,397)	(73,823)	(767,166)	(10,287)
Preferred stock dividends	2,015	2,015	6,045	6,042
Net loss available to common shareholders	(286,412)	(75,838)	(773,211)	(16,329)
Net loss available to common shareholders	(286,412)	(75,838)	(773,211)	(16,329)
Sale of goods
Segment Reporting Information [Line Items]
Total revenues	55,248	60,029	164,254	184,301
Trading (loss) income
Segment Reporting Information [Line Items]
Total revenues	(1,238)	(9,727)	(50,226)	31,723
Fair value adjustments on loans
Segment Reporting Information [Line Items]
Total revenues	(71,477)	(860)	(259,260)	51,623
Interest income - loans
Segment Reporting Information [Line Items]
Total revenues	11,251	27,397	51,894	102,535
Interest income - securities lending
Segment Reporting Information [Line Items]
Total revenues	7,007	42,333	69,614	119,580
Operating Segments
Segment Reporting Information [Line Items]
Operating (loss) income	(52,610)	13,123	(247,449)	200,796
All Other
Segment Reporting Information [Line Items]
Direct cost of services	(13,406)	(6,604)	(36,662)	(19,543)
Corporate and other expenses	(45,817)	(24,429)	(114,071)	(68,761)
Interest income	1,438	180	2,909	3,455
Dividend income	675	3,373	4,139	9,541
Realized and unrealized (losses) gains on investments	(22,197)	(77,287)	(212,362)	(77,020)
Change in fair value of financial instruments and other	476	(4,170)	627	(3,998)
Income (loss) from equity investments	6	(308)	12	(175)
Interest expense	(32,996)	(37,493)	(102,195)	(118,630)
All Other \| Services and fees
Segment Reporting Information [Line Items]
Total revenues	28,506	9,928	75,329	28,870
Capital Markets Segment \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	(24,690)	139,566	(49,513)	487,029
Selling, general and administrative expenses	(30,453)	(62,898)	(133,483)	(174,479)
Impairment of tradenames	0	0	0	(1,733)
Interest expense - Securities lending and loan participations sold	(6,359)	(38,368)	(65,055)	(106,572)
Depreciation and amortization	(817)	(900)	(2,333)	(3,149)
Operating (loss) income	(62,319)	37,400	(250,384)	201,096
Capital Markets Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Total revenues	30,437	80,913	141,026	183,803
Capital Markets Segment \| Operating Segments \| Trading (loss) income
Segment Reporting Information [Line Items]
Total revenues	(1,908)	(10,217)	(52,787)	29,488
Capital Markets Segment \| Operating Segments \| Fair value adjustments on loans
Segment Reporting Information [Line Items]
Total revenues	(71,477)	(860)	(259,260)	51,623
Capital Markets Segment \| Operating Segments \| Interest income - loans
Segment Reporting Information [Line Items]
Total revenues	11,251	27,397	51,894	102,535
Capital Markets Segment \| Operating Segments \| Interest income - securities lending
Segment Reporting Information [Line Items]
Total revenues	7,007	42,333	69,614	119,580
Wealth Management Segment \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	50,059	51,365	152,714	148,895
Selling, general and administrative expenses	(48,234)	(47,891)	(145,439)	(143,177)
Depreciation and amortization	(1,045)	(1,075)	(3,148)	(3,243)
Restructuring charge	0	0	0	(61)
Operating (loss) income	780	2,399	4,127	2,414
Wealth Management Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Total revenues	49,389	50,875	150,153	146,660
Wealth Management Segment \| Operating Segments \| Trading (loss) income
Segment Reporting Information [Line Items]
Total revenues	670	490	2,561	2,235
Financial Consulting Segment \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	23,941	20,225	69,383	52,325
Selling, general and administrative expenses	(19,705)	(17,843)	(56,277)	(42,932)
Depreciation and amortization	(108)	(82)	(276)	(234)
Operating (loss) income	4,128	2,300	12,830	9,159
Financial Consulting Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Total revenues	23,941	20,225	69,383	52,325
Communications Segment \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	67,559	83,793	229,134	255,668
Direct cost of services	(36,253)	(46,012)	(131,346)	(136,830)
Cost of goods sold	(1,350)	(1,750)	(4,323)	(5,964)
Selling, general and administrative expenses	(16,665)	(21,655)	(54,136)	(64,440)
Depreciation and amortization	(4,868)	(6,739)	(16,750)	(19,775)
Restructuring charge	(116)	(145)	(379)	(402)
Operating (loss) income	8,307	7,492	22,200	28,257
Communications Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Total revenues	66,241	82,155	225,055	250,523
Communications Segment \| Operating Segments \| Sale of goods
Segment Reporting Information [Line Items]
Total revenues	1,318	1,638	4,079	5,145
Communications Segment \| All Other
Segment Reporting Information [Line Items]
Total revenues	32,643	9,928	82,765	28,870
Cost of goods sold	(2,556)	0	(5,304)	0
Communications Segment \| All Other \| Sale of goods
Segment Reporting Information [Line Items]
Total revenues	4,137	0	7,436	0
Consumer Products Segment \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	49,793	58,391	152,739	179,156
Cost of goods sold	(36,406)	(40,467)	(109,270)	(123,526)
Selling, general and administrative expenses	(14,959)	(16,214)	(45,602)	(51,990)
Depreciation and amortization	(1,934)	(2,595)	(5,862)	(7,784)
Restructuring charge	0	(83)	(546)	(486)
Impairment of goodwill and tradenames	0	(35,500)	(27,681)	(35,500)
Operating (loss) income	(3,506)	(36,468)	(36,222)	(40,130)
Consumer Products Segment \| Operating Segments \| Sale of goods
Segment Reporting Information [Line Items]
Total revenues	$ 49,793	$ 58,391	$ 152,739	$ 179,156

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