Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (156,594)	$ 450,802	$ 204,017
Other comprehensive (loss) income:
Change in cumulative translation adjustment	(1,390)	(257)	1,165
Other comprehensive (loss) income, net of tax	(1,390)	(257)	1,165
Total comprehensive (loss) income	(157,984)	450,545	205,182
Comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests	6,565	5,748	(1,131)
Comprehensive (loss) income attributable to B. Riley Financial, Inc.	$ (164,549)	$ 444,797	$ 206,313