Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 52,645	$ 51,658	$ (93,139)	$ 383,356
Other comprehensive income (loss):
Change in cumulative translation adjustment	(2,842)	(1,029)	(5,646)	(1,384)
Other comprehensive loss, net of tax	(2,842)	(1,029)	(5,646)	(1,384)
Total comprehensive income (loss)	49,803	50,629	(98,785)	381,972
Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interests	6,187	1,108	10,751	2,474
Comprehensive income (loss) attributable to B. Riley Financial, Inc.	$ 43,616	$ 49,521	$ (109,536)	$ 379,498