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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Aug. 01, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Aug. 01, 2021	Sep. 30, 2021	Sep. 30, 2020
Noncontrolling Interest [Line Items]
Net loss attributable to MDC Partners Inc.	$ 3,102	$ 2,229	$ (2,071)	$ 17,808	$ 27,435	$ 20,199	$ 34,124
Purchases of NCI		(771)
Stagwell Inc. Shareholders' Equity
Noncontrolling Interest [Line Items]
Net loss attributable to MDC Partners Inc.	$ 3,032	(4,545)	(2,071)	17,808	$ 24,742	20,199	34,124
Purchases of NCI		$ 9,679	9,679	0		9,679	0
Change from net income (loss) attributable to Stagwell Inc. and transfers to noncontrolling interests			$ (7,608)	$ (17,808)		$ (29,878)	$ (34,124)

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