ACQUISITIONS - Pro forma (Details) - Targus - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Revenues	$ 1,418,291	$ 1,887,385
Net (loss) income	(138,448)	461,892
Net (loss) income attributable to B. Riley Financial, Inc.	(141,683)	456,144
Net (loss) income attributable to common shareholders	$ (149,691)	$ 448,687