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Income (Loss) Per Common Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share The following table sets forth the computation of basic and diluted loss per common share:
 Twelve Months Ended December 31,
 202020192018
Numerator:
Net loss attributable to MDC Partners Inc.$(228,971)$(5,253)$(130,007)
Accretion on convertible preference shares(14,179)(12,304)(8,355)
Net loss attributable to MDC Partners Inc. common shareholders$(243,150)$(17,557)$(138,362)
Denominator:
Basic weighted average number of common shares outstanding72,862,178 69,132,100 57,218,994 
Dilutive effect of equity awards— — — 
Diluted weighted average number of common shares outstanding72,862,178 69,132,100 57,218,994 
Basic$(3.34)$(0.25)$(2.42)
Diluted$(3.34)$(0.25)$(2.42)