Consolidated Statements of Equity - USD ($) $ in Thousands	Total	FocalPoint Securities, LLC	Preferred Stock	Common Stock, par value $0.0001 per share	Common Stock, par value $0.0001 per share FocalPoint Securities, LLC	Additional Paid-in Capital	Additional Paid-in Capital FocalPoint Securities, LLC	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Preferred stock, shares outstanding, beginning balance (in shares) at Dec. 31, 2019			2,349
Balance at Dec. 31, 2019	$ 390,251		$ 0	$ 3		$ 323,109		$ 39,536	$ (1,988)	$ 29,591
Common stock, shares outstanding, beginning balance (in shares) at Dec. 31, 2019				26,972,332
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock issued (in shares)			1,622
Preferred stock issued	39,455					39,455
ESPP shares issued and vesting of restricted stock, net of shares withheld for employer taxes (in shares)				1,358,212
ESPP shares issued and vesting of restricted stock, net of shares withheld for employer taxes	(22,578)					(22,578)
Common stock repurchased and retired (in shares)				(2,552,748)
Common stock repurchased and retired	(48,248)					(48,248)
Share based payments	18,588					18,588
Dividends on common stock	(36,894)							(36,894)
Dividends on preferred stock	(4,710)							(4,710)
Net (loss) income	204,017							205,148		(1,131)
Distributions to noncontrolling interests	2,690									2,690
Contributions from noncontrolling interests	604									604
Foreign currency translation adjustment	1,165								1,165
Preferred stock, shares outstanding, ending balance (in shares) at Dec. 31, 2020			3,971
Balance at Dec. 31, 2020	538,960		$ 0	$ 3		310,326		203,080	(823)	26,374
Common stock, shares outstanding, ending balance (in shares) at Dec. 31, 2020				25,777,796
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued, net of offering costs (in shares)				1,413,045
Common stock issued, net of offering costs	64,713					64,713
Preferred stock issued (in shares)			541
Preferred stock issued	14,712					14,712
ESPP shares issued and vesting of restricted stock, net of shares withheld for employer taxes (in shares)				433,182
ESPP shares issued and vesting of restricted stock, net of shares withheld for employer taxes	(9,620)					(9,620)
Common stock repurchased and retired (in shares)				(44,650)
Common stock repurchased and retired	(2,656)					(2,656)
Warrants exercised (in shares)				11,655
Share based payments	36,011					36,011
Dividends on common stock	(373,633)							(373,633)
Dividends on preferred stock	(7,457)							(7,457)
Net (loss) income	450,802							445,054		5,748
Remeasurement of B. Riley Principal 150 and 250 Merger Corporations subsidiary temporary equity	(18,182)							(18,182)
Distributions to noncontrolling interests	15,497							0		15,497
Contributions from noncontrolling interests	13,680									13,680
Acquisition of noncontrolling interests	13,625									13,625
Foreign currency translation adjustment	$ (257)								(257)
Preferred stock, shares outstanding, ending balance (in shares) at Dec. 31, 2021	4,512		4,512
Balance at Dec. 31, 2021	$ 705,201		$ 0	$ 3		413,486		248,862	(1,080)	43,930
Common stock, shares outstanding, ending balance (in shares) at Dec. 31, 2021	27,591,028			27,591,028
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock issued (in shares)			33
Preferred stock issued	$ 874					874
ESPP shares issued and vesting of restricted stock, net of shares withheld for employer taxes (in shares)				583,624
ESPP shares issued and vesting of restricted stock, net of shares withheld for employer taxes	(10,271)					(10,271)
Common stock repurchased and retired (in shares)				(183,257)
Common stock repurchased and retired	(6,516)					(6,516)
Shares issued for acquisitions (in shares)					532,369
Shares issued for acquisitions		$ 35,648					$ 35,648
Share based payments	60,890					60,890
Share based payments in equity of subsidiary	125					125
Vesting of shares in equity of subsidiary	0					(35)				35
Dividends on common stock	(124,891)							(124,891)
Dividends on preferred stock	(8,008)							(8,008)
Net (loss) income	(154,026)							(159,829)		5,803
Remeasurement of B. Riley Principal 150 and 250 Merger Corporations subsidiary temporary equity	(1,354)							(1,354)
Distributions to noncontrolling interests	11,731									11,731
Contributions from noncontrolling interests	21,160									21,160
Acquisition of noncontrolling interests	182									182
Other comprehensive loss	$ (1,390)								(1,390)
Preferred stock, shares outstanding, ending balance (in shares) at Dec. 31, 2022	4,545		4,545
Balance at Dec. 31, 2022	$ 505,893		$ 0	$ 3		$ 494,201		$ (45,220)	$ (2,470)	$ 59,379
Common stock, shares outstanding, ending balance (in shares) at Dec. 31, 2022	28,523,764			28,523,764