Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (136,588)	$ 75,100	$ (145,784)	$ 331,698
Other comprehensive income (loss):
Change in cumulative translation adjustment	(2,316)	281	(2,804)	(355)
Other comprehensive (loss) income, net of tax	(2,316)	281	(2,804)	(355)
Total comprehensive (loss) income	(138,904)	75,381	(148,588)	331,343
Comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests	3,698	(576)	4,564	1,366
Comprehensive (loss) income attributable to B. Riley Financial, Inc.	$ (142,602)	$ 75,957	$ (153,152)	$ 329,977