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Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Class of Stock [Line Items]
Net loss attributable to MDC Partners Inc.	$ (29,416)	$ (10,566)
Numerator
Numerator for basic loss per common share - Net loss attributable to MDC Partners Inc. common shareholders	(31,443)	(11,073)
Numerator for diluted loss per common share- Net loss attributable to MDC Partners Inc. common shareholders	$ (31,443)	$ (11,073)
Denominator
Denominator for basic income (loss) per common share - weighted average common shares	56,415,042	52,998,244
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions	56,415,042	52,998,244
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share)	$ (0.56)	$ (0.21)
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share)	$ (0.56)	$ (0.21)
Series 4 Convertible Preferred Stock | Convertible Preferred Stock
Numerator
Accretion on convertible preference shares	$ (2,027)	$ (507)
Net income allocated to convertible preference shares	$ 0	$ 0

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