BUSINESS SEGMENTS - Schedule of reportable segments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 148,365	$ 406,278	$ 491,397	$ 838,368
Direct cost of services	(61,551)	(55,941)	(122,677)	(110,338)
Cost of goods sold	(46,718)	(40,317)	(86,333)	(87,943)
Selling, general and administrative expenses	(209,338)	(188,885)	(418,886)	(401,512)
Interest expense - Securities lending and loan participations sold	(23,313)	(35,780)	(58,696)	(68,204)
Depreciation and amortization			(22,936)	(25,611)
Restructuring charge	(20)	(628)	(809)	(721)
Impairment of goodwill and tradenames	(27,681)	(1,733)	(27,681)	(1,733)
Operating (loss) income	(220,256)	82,994	(223,685)	167,917
Interest income	804	701	1,473	3,275
Dividend income	9,209	9,555	21,024	22,759
Realized and unrealized (losses) gains on investments	(155,690)	18,843	(185,235)	(9,599)
Change in fair value of financial instruments and other	(163)	381	151	172
Income from equity investments	10	143	6	133
Interest expense	(42,687)	(47,332)	(87,551)	(94,893)
(Loss) income before income taxes	(408,773)	65,285	(473,817)	89,764
Provision for income taxes	(25,008)	(21,504)	(7,918)	(29,423)
Net (loss) income	(433,781)	43,781	(481,735)	60,341
Net (loss) income attributable to noncontrolling interests and redeemable noncontrolling interests	(177)	(2,600)	1,034	(3,195)
Net (loss) income attributable to B. Riley Financial, Inc.	(433,604)	46,381	(482,769)	63,536
Preferred stock dividends	2,015	2,015	4,030	4,027
Net (loss) income available to common shareholders	(435,619)	44,366	(486,799)	59,509
Net (loss) income available to common shareholders	(435,619)	44,366	(486,799)	59,509
Services and fees
Segment Reporting Information [Line Items]
Revenues	248,025	230,327	505,328	465,886
Trading (loss) income
Segment Reporting Information [Line Items]
Revenues	(31,321)	33,158	(48,988)	41,450
Fair value adjustments on loans
Segment Reporting Information [Line Items]
Revenues	(175,582)	9,207	(187,783)	52,483
Interest income - loans
Segment Reporting Information [Line Items]
Revenues	18,508	35,126	40,643	75,138
Interest income - securities lending
Segment Reporting Information [Line Items]
Revenues	24,798	40,073	62,607	77,247
Operating Segments
Segment Reporting Information [Line Items]
Operating (loss) income	(202,151)	96,758	(187,215)	197,303
All Other
Segment Reporting Information [Line Items]
Revenues	32,987	14,710	59,661
Direct cost of services	(12,405)	(6,403)	(23,256)	(12,939)
Corporate and other expenses	(36,527)	(22,071)	(70,127)	(44,739)
Interest income	804	701	1,473	3,275
Dividend income	9,209	9,555	21,024	22,759
Realized and unrealized (losses) gains on investments	(155,690)	18,843	(185,235)	(9,599)
Change in fair value of financial instruments and other	(163)	381	151	172
Income from equity investments	10	143	6	133
Interest expense	(42,687)	(47,332)	(87,551)	(94,893)
All Other \| Services and fees
Segment Reporting Information [Line Items]
Revenues	30,303	14,710	56,362	28,292
Capital Markets Segment \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	(114,646)	162,052	(24,823)	347,463
Selling, general and administrative expenses	(49,806)	(45,870)	(103,030)	(111,581)
Impairment of tradenames	0	(1,733)	0	(1,733)
Interest expense - Securities lending and loan participations sold	(23,313)	(35,780)	(58,696)	(68,204)
Depreciation and amortization	(745)	(993)	(1,516)	(2,249)
Operating (loss) income	(188,510)	77,676	(188,065)	163,696
Capital Markets Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Revenues	50,242	44,961	110,589	102,890
Capital Markets Segment \| Operating Segments \| Trading (loss) income
Segment Reporting Information [Line Items]
Revenues	(32,612)	32,685	(50,879)	39,705
Capital Markets Segment \| Operating Segments \| Fair value adjustments on loans
Segment Reporting Information [Line Items]
Revenues	(175,582)	9,207	(187,783)	52,483
Capital Markets Segment \| Operating Segments \| Interest income - loans
Segment Reporting Information [Line Items]
Revenues	18,508	35,126	40,643	75,138
Capital Markets Segment \| Operating Segments \| Interest income - securities lending
Segment Reporting Information [Line Items]
Revenues	24,798	40,073	62,607	77,247
Wealth Management Segment \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	50,873	47,716	102,655	97,530
Selling, general and administrative expenses	(48,157)	(47,964)	(97,205)	(95,286)
Depreciation and amortization	(1,048)	(1,082)	(2,103)	(2,168)
Restructuring charge	0	(28)	0	(61)
Operating (loss) income	1,668	(1,358)	3,347	15
Wealth Management Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Revenues	49,582	47,243	100,764	95,785
Wealth Management Segment \| Operating Segments \| Trading (loss) income
Segment Reporting Information [Line Items]
Revenues	1,291	473	1,891	1,745
Auction and Liquidation Segment \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	11,985	10,561	17,765	16,221
Direct cost of services	(2,872)	(3,453)	(4,328)	(6,581)
Cost of goods sold	(6,960)	(618)	(7,748)	(670)
Selling, general and administrative expenses	(1,861)	(2,302)	(3,369)	(4,582)
Operating (loss) income	292	4,188	2,320	4,388
Auction and Liquidation Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Revenues	3,621	8,885	7,181	14,329
Auction and Liquidation Segment \| Operating Segments \| Sale of goods
Segment Reporting Information [Line Items]
Revenues	8,364	1,676	10,584	1,892
Financial Consulting Segment \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	36,533	31,212	71,618	56,222
Selling, general and administrative expenses	(28,584)	(22,791)	(57,444)	(43,940)
Depreciation and amortization	(83)	(103)	(168)	(181)
Operating (loss) income	7,866	8,318	14,006	12,101
Financial Consulting Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Revenues	36,533	31,212	71,618	56,222
Communications Segment \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	79,209	84,956	161,575	171,875
Direct cost of services	(46,274)	(46,085)	(95,093)	(90,818)
Cost of goods sold	(1,614)	(2,046)	(2,973)	(4,214)
Selling, general and administrative expenses	(19,553)	(20,241)	(37,471)	(42,785)
Depreciation and amortization	(5,925)	(6,405)	(11,882)	(13,036)
Restructuring charge	0	(197)	(263)	(257)
Operating (loss) income	5,843	9,982	13,893	20,765
Communications Segment \| Operating Segments \| Services and fees
Segment Reporting Information [Line Items]
Revenues	77,744	83,316	158,814	168,368
Communications Segment \| Operating Segments \| Sale of goods
Segment Reporting Information [Line Items]
Revenues	1,465	1,640	2,761	3,507
Communications Segment \| All Other
Segment Reporting Information [Line Items]
Revenues	32,987	14,710	59,661	28,292
Cost of goods sold	(2,160)	0	(2,748)	0
Communications Segment \| All Other \| Sale of goods
Segment Reporting Information [Line Items]
Revenues	2,684	0	3,299	0
Consumer Products Segment \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	51,424	55,071	102,946	120,765
Cost of goods sold	(35,984)	(37,653)	(72,864)	(83,059)
Selling, general and administrative expenses	(15,118)	(16,482)	(30,643)	(35,776)
Depreciation and amortization	(1,931)	(2,581)	(3,928)	(5,189)
Restructuring charge	(20)	(403)	(546)	(403)
Impairment of goodwill and tradenames	(27,681)	0	(27,681)	0
Operating (loss) income	(29,310)	(2,048)	(32,716)	(3,662)
Consumer Products Segment \| Operating Segments \| Sale of goods
Segment Reporting Information [Line Items]
Revenues	$ 51,424	$ 55,071	$ 102,946	$ 120,765

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