v3.6.0.2

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

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

Name:	mc_EquityMethodInvestmentsPercentageOfPurchasePriceToBePaidImmediatelyIfParentIsPublicAndPutOptionIsExercised
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: