EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income (loss) attributable to B. Riley Financial, Inc.	$ 8,664	$ (777)	$ 11,346	$ (2,111)
Weighted average shares outstanding:
Basic	16,237,860	4,972,203	16,177,824	3,212,929
Effect of dilutive potential common shares:
Restricted stock units	28,091		14,046
Contingently issuable shares	44,878		44,878
Diluted	16,310,829	4,972,203	16,236,748	3,212,929
Basic income (loss) per share	$ 0.53	$ (0.16)	$ 0.70	$ (0.66)
Diluted income (loss) per share	$ 0.53	$ (0.16)	$ 0.70	$ (0.66)