VARIABLE INTEREST ENTITIES (Details Textual) € in Millions, $ in Millions	1 Months Ended					3 Months Ended		6 Months Ended
	May. 31, 2015 USD ($) mutual_fund	Jan. 31, 2015 USD ($)	Oct. 31, 2014 EUR (€)	Oct. 31, 2014 USD ($)	Jan. 31, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Number_of_Limited_Partnership Number_of_Limited_Liability_Companies	Jun. 30, 2014 USD ($)
Variable Interest Entity [Line Items]
Number of clients in which investment advisory services are provided | Number_of_Limited_Partnership								2
Number of limited liability companies in which some clients hold their investments | Number_of_Limited_Liability_Companies								10
New Westwood mutual funds | mutual_fund	2
Fee revenues from Westwood VIEs						$ 15.1	$ 11.2	$ 29.3	$ 22.5
Westwood Mutual Fund
Variable Interest Entity [Line Items]
Amount provided to fund for the sole purpose of showing economic substance	$ 5.4
Common Trust Funds
Variable Interest Entity [Line Items]
Amount provided to fund for the sole purpose of showing economic substance		$ 1.0			$ 2.0
UCITS Fund
Variable Interest Entity [Line Items]
Amount provided to fund for the sole purpose of showing economic substance			€ 1.6	$ 2.0