COMMITMENTS AND CONTINGENCIES - Joint Venture Put and Call Options and Legal (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2015	Jun. 30, 2016
Legal
Litigation settlement expense	$ 2.8
Moelis Australia Holdings
Joint venture put and call options
Percentage of purchase price to be paid immediately if the Parent is public and the put option is exercised		50.00%
Period within which the remaining balance is to be paid if the parent is public and the put option is exercised		18 months