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Quarterly Results of Operations - Schedule of Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 328,168	$ 283,423	$ 259,678	$ 327,742	$ 381,975	$ 342,907	$ 362,130	$ 328,791	$ 1,199,011	$ 1,415,803	$ 1,475,088
Cost of services sold	209,043	172,531	165,632	222,693	260,725	222,448	240,749	237,154	769,899	961,076	991,198
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(226,303)	14,804	2,508	1,794	(2,259)	5,513	7,333	316
Net loss attributable to MDC Partners Inc.	$ (233,457)	$ 4,076	$ (593)	$ 1,003	$ (7,678)	$ (1,752)	$ 4,290	$ (113)	$ (228,971)	$ (5,253)	$ (130,007)
Earnings Per Share, Basic	$ (3.23)	$ (0.07)	$ (0.06)	$ (0.03)	$ (0.15)	$ (0.07)	$ 0.01	$ (0.04)
Earnings Per Share, Diluted	$ (3.23)	$ (0.07)	$ (0.06)	$ (0.03)	$ (0.15)	$ (0.07)	$ 0.01	$ (0.04)

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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