v3.6.0.2

COMMITMENTS AND CONTINGENCIES - Joint Venture Put and Call Options and Legal (Details) - Moelis Australia Holdings | 12 Months Ended
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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

X
- Definition Represents the percentage of purchase price to be paid immediately if the parent is public and the put option is exercised. + References No definition available. + Details
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Namespace Prefix: | mc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the period within which the remaining balance is to be paid if the parent is public and the put option is exercised. + References No definition available. + Details
Name: | mc_EquityMethodInvestmentsPeriodWithinWhichRemainingBalanceIsToBePaidIfParentIsPublicAndPutOptionIsExercised
Namespace Prefix: | mc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=mc_MoelisAustraliaHoldingsPTYLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |