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REGULATORY REQUIREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Regulatory requirements    
Minimum net capital requirement $ 250us-gaap_AlternativeNetCapitalRequirement1  
Moelis US    
Regulatory requirements    
Net capital 32,769us-gaap_NetCapital
/ dei_LegalEntityAxis
= mc_MoelisAndCompanyLLCMember
80,270us-gaap_NetCapital
/ dei_LegalEntityAxis
= mc_MoelisAndCompanyLLCMember
Net capital in excess of required net capital 32,519us-gaap_AlternativeExcessNetCapital
/ dei_LegalEntityAxis
= mc_MoelisAndCompanyLLCMember
80,020us-gaap_AlternativeExcessNetCapital
/ dei_LegalEntityAxis
= mc_MoelisAndCompanyLLCMember
Moelis UK    
Regulatory requirements    
Net capital 18,923us-gaap_NetCapital
/ dei_LegalEntityAxis
= mc_MoelisAndCompanyUKLLPMember
22,980us-gaap_NetCapital
/ dei_LegalEntityAxis
= mc_MoelisAndCompanyUKLLPMember
Net capital in excess of required net capital $ 18,868us-gaap_AlternativeExcessNetCapital
/ dei_LegalEntityAxis
= mc_MoelisAndCompanyUKLLPMember
$ 22,919us-gaap_AlternativeExcessNetCapital
/ dei_LegalEntityAxis
= mc_MoelisAndCompanyUKLLPMember