COMMITMENTS AND CONTINGENCIES - Joint Venture Put and Call Options and Legal (Details) - Moelis Australia Holdings	12 Months Ended
Dec. 31, 2016
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

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