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VARIABLE INTEREST ENTITIES - Additional information (Details) $ in Thousands			3 Months Ended
		Aug. 14, 2025 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Mar. 10, 2025 USD ($)	Jan. 06, 2025	Aug. 14, 2024	May 03, 2024 company
Variable Interest Entity [Line Items]
Variable interest entity, primary beneficiary, maximum loss exposure, amount					$ 1,835
Agent fees			$ 0	$ 0
Number of brand apparel operating companies | company									2
Repayments of notes payable	[1]		$ 297	12,834
Noncontrolling interest, estimated recognized loss amount						$ 1,575
BRC Partners Opportunity Fund, LP | BRC Trust | Investor
Variable Interest Entity [Line Items]
Ownership, percentage							13.40%
BRC Partners Opportunity Fund, LP | BRC Trust | Related Party
Variable Interest Entity [Line Items]
Ownership, percentage							58.20%
B. Riley Securities Holdings, Inc.
Variable Interest Entity [Line Items]
Ownership, percentage			91.80%		90.70%
B. Riley Securities Holdings, Inc. | Capital Markets segment
Variable Interest Entity [Line Items]
Ownership, percentage						0.60%
Bicoastal Alliance, LLC
Variable Interest Entity [Line Items]
Rate of equity interests								50.00%	50.00%
Repayments of notes payable		$ 700
Gain on disposition of business				$ 28,411
Minimum
Variable Interest Entity [Line Items]
Cash fee percentage			7.00%
Carried interest percentage			8.00%
Maximum
Variable Interest Entity [Line Items]
Cash fee percentage			10.00%
Carried interest percentage			15.00%
[1] Amounts presented contain results from both continuing and discontinued operations. Refer to Note 4 – Discontinued Operations and Assets Held for Sale for additional information regarding cash flow associated with the results of discontinued operations.

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