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EQUITY METHOD INVESTMENTS (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2014
Equity Method Investments      
Income (loss) from equity method investment $ 2,865us-gaap_IncomeLossFromEquityMethodInvestments $ (1,220)us-gaap_IncomeLossFromEquityMethodInvestments  
Cash contribution made   4,180us-gaap_PaymentsToAcquireEquityMethodInvestments  
Moelis Australia Holdings      
Equity Method Investments      
Ownership percentage (as a percent) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= mc_MoelisAustraliaHoldingsPTYLimitedMember
   
Moelis Australia Holdings      
Equity Method Investments      
Ownership percentage (as a percent) 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mc_MoelisAustraliaHoldingsPTYLimitedMember
   
Income (loss) from equity method investment 312us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mc_MoelisAustraliaHoldingsPTYLimitedMember
(1,220)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mc_MoelisAustraliaHoldingsPTYLimitedMember
 
Cash contribution made   4,180us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mc_MoelisAustraliaHoldingsPTYLimitedMember
 
Entity controlled by Moelis Asset Management LP      
Equity Method Investments      
Income (loss) from equity method investment 2,553us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mc_EntityControlledByMoelisAssetManagementLPMember
   
Cash contribution made     $ 265us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mc_EntityControlledByMoelisAssetManagementLPMember