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Cover
Jul. 29, 2021
Cover [Abstract]  
Document Type 8-K12B
Amendment Flag false
Document Period End Date Jul. 29, 2021
Current Fiscal Year End Date --12-31
Entity File Number 001-13718
Entity Registrant Name MDC STAGWELL HOLDINGS INC.
Entity Central Index Key 0000876883
Entity Tax Identification Number 98-0364441
Entity Incorporation, State or Country Code DE
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Class A Subordinate Voting Shares, par value $0.001 per share
Trading Symbol MDCA
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Information, Former Legal or Registered Name MDC Partners Inc.