REGULATORY REQUIREMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Regulatory requirements
Minimum net capital requirement	$ 250
Moelis US
Regulatory requirements
Net capital	45,821	$ 80,270
Net capital in excess of required net capital	45,571	80,020
Moelis UK
Regulatory requirements
Net capital	18,104	22,980
Net capital in excess of required net capital	$ 18,048	$ 22,919