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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Noncontrolling Interest [Line Items]
Net loss attributable to MDC Partners Inc.	$ 5,010	$ 1,002
Business acquisitions and step-up transactions, net of tax	(330)	(503)
Change from Net income attributable to MDC Partners Inc. and transfers to noncontrolling interests	(4,680)	(499)
MDC Partners Inc. Shareholders' Deficit
Noncontrolling Interest [Line Items]
Business acquisitions and step-up transactions, net of tax	$ (330)	$ (503)

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