XML 29 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Feb. 25, 2021
Entity Information [Line Items]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2020  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-13718  
Entity Registrant Name MDC PARTNERS INC.  
Entity Incorporation, State or Country Code Z4  
Entity Tax Identification Number 98-0364441  
Entity Address, Address Line One One World Trade Center  
Entity Address, Address Line Two Floor 65  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10007  
City Area Code 646  
Local Phone Number 429-1800  
Title of 12(b) Security Class A Subordinate Voting Shares, no par value  
Trading Symbol MDCA  
Security Exchange Name NASDAQ  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Icfr Auditor Attestation Flag true  
Entity Shell Company false  
Entity Public Float $ 120.0  
Documents Incorporated by Reference Portions of the Registrant’s Proxy Statement relating to the 2021 Annual General Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K where indicated.  
Entity Central Index Key 0000876883  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus FY  
Amendment Flag false  
Common Class A | Common Shares    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   73,722,720
Common Class B | Common Shares    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,743