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VARIABLE INTEREST ENTITIES - Additional information (Details) $ in Thousands					6 Months Ended
		May 26, 2026 USD ($)	Apr. 14, 2026 USD ($)	Aug. 14, 2025 USD ($)	Jun. 30, 2026 USD ($)	Jun. 30, 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
Number of brand apparel operating companies | company											2
Repayments of notes payable	[1]				$ 592	$ 13,138
Noncontrolling interest, estimated recognized loss amount								$ 1,575
B. Riley Securities Holdings, Inc.
Variable Interest Entity [Line Items]
Ownership, percentage					92.90%		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 (loss) on disposition of business						$ 28,411
Investor | BRC Partners Opportunity Fund, LP | BRC Trust
Variable Interest Entity [Line Items]
Ownership, percentage									13.30%
Related Party | BRC Partners Opportunity Fund, LP | BRC Trust
Variable Interest Entity [Line Items]
Ownership, percentage									58.20%
Equity securities | Enovum Loan | Enovum Loan | Non Affiliate
Variable Interest Entity [Line Items]
Variable interest entity, primary beneficiary, maximum loss exposure, amount					$ 20,545
Principal amount		$ 20,000
Purchase consideration paid		$ 19,400
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Purchase of equity investments			$ 750
Maximum exposure to loss					$ 1,294
Variable Interest Entity, Not Primary Beneficiary | Special Purpose Entity
Variable Interest Entity [Line Items]
Rate of equity interests			7.00%
[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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