ACQUISITIONS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jul. 02, 2015	Feb. 02, 2015	Dec. 31, 2014	Jun. 18, 2014
Tangible assets acquired and assumed:
Goodwill	$ 34,528		$ 6,971	$ 27,557
MK Capital [Member]
Tangible assets acquired and assumed:
Cash and cash equivalents		$ 49
Accounts receivable		8
Prepaid expenses and other assets		30
Property and equipment		15
Accounts payable and accrued liabilities		(87)
Customer relationships		2,400
Goodwill		6,971
Total		$ 9,386
B. Riley and Co. Inc. [Member]
Tangible assets acquired and assumed:
Cash and cash equivalents					$ 2,667
Restricted cash					50
Securities owned					1,978
Accounts receivable					1,845
Prepaid expenses and other assets					302
Property and equipment					76
Accounts payable and accrued liabilities					(3,194)
Securities sold, not yet purchased					(922)
Deferred tax liability					(1,120)
Customer relationships					1,200
Tradename					1,600
Goodwill					21,869
Total					$ 26,351