EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income (loss) attributable to B. Riley Financial, Inc.	$ 1,463	$ (868)	$ 12,809	$ (2,979)
Weighted average shares outstanding:
Basic	16,243,425	15,911,482	16,199,931	7,492,295
Effect of dilutive potential common shares:
Restricted stock units	56,349		28,147
Contingently issuable shares	44,875		44,875
Diluted	16,344,649	15,911,482	16,272,953	7,492,295
Basic income (loss) per share	$ 0.09	$ (0.05)	$ 0.79	$ (0.40)
Diluted income (loss) per share	$ 0.09	$ (0.05)	$ 0.79	$ (0.40)