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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Noncontrolling Interest [Line Items]
Net loss attributable to MDC Partners Inc.	$ (113)	$ (29,416)
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests	113	30,582
MDC Partners Inc. Shareholders' Deficit
Noncontrolling Interest [Line Items]
Net loss attributable to MDC Partners Inc.		(29,416)
Decrease in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of redeemable noncontrolling interests and noncontrolling interests	$ 0	$ 1,166

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