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Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Class of Stock [Line Items]
Net loss attributable to MDC Partners Inc.	$ 5,010	$ 1,002
Numerator
Net income (loss) attributable to MDC Partners Inc. common shareholders	$ 921	$ (2,438)
Denominator
Denominator for basic income (loss) per common share - weighted average common shares	73,392,824	72,397,661,000
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions	75,439,066	72,397,661,000
Earnings per share, basic	$ 0.01	$ (0.03)
Earnings per share, diluted	$ 0.01	$ (0.03)
Series 4 Convertible Preferred Stock | Convertible Preference Shares
Numerator
Accretion on and net income allocated to convertible preference shares	$ (3,724)
Net income allocated to convertible preference shares	$ (365)	$ 0
Denominator
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,920,634	2,835,770

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