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Segment Information (Details 1) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) reportable_segment	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | reportable_segment										3
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
Adjusted EBITDA									177,332	174,153	161,451
Depreciation and amortization									(36,905)	(38,329)	(46,196)
Goodwill and other asset impairment	(77,240)				(6,655)				(96,399)	(8,599)	(87,204)
Stock-based compensation	(3,611)				(18,408)				(14,179)	(31,040)	(18,416)
Deferred acquisition consideration expense/(income)									(42,187)	(5,403)	457
Loss on investments									(2,175)	(2,048)	(779)
Other expense									(31,244)	(9,274)	(7,879)
Segment operating income (loss)									(45,757)	79,460	1,434
Interest expense and finance charges									(62,163)	(64,942)	(67,075)
Foreign exchange gain (loss)	6,274				4,349				(982)	8,750	(23,258)
Other, net									20,500	(2,401)	230
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates									(88,402)	20,867	(88,669)
Income tax expense									116,555	10,316	29,615
Income (loss) before equity in earnings of non-consolidated affiliates									(204,957)	10,551	(118,284)
Equity in earnings of non-consolidated affiliates									(2,240)	352	62
Net income (loss)									(207,197)	10,903	(118,222)
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 income attributable to the noncontrolling interest									(21,774)	(16,156)	(11,785)
Net income (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)
Capital expenditures									37,303	18,596	20,264
Capital Expenditures Incurred but Not yet Paid									12,993
Integrated Networks - Group A
Segment Reporting Information [Line Items]
Revenue									379,648	392,101	393,890
Adjusted EBITDA									79,793	74,822	75,609
Depreciation and amortization									(6,467)	(8,559)	(9,602)
Stock-based compensation									(7,580)	(24,420)	(5,792)
Capital expenditures									1,087	5,934	8,228
Integrated Networks - Group B
Segment Reporting Information [Line Items]
Revenue									435,589	531,717	551,317
Adjusted EBITDA									84,297	84,568	74,091
Depreciation and amortization									(17,204)	(15,904)	(19,032)
Stock-based compensation									(3,191)	(4,303)	(6,890)
Capital expenditures									987	9,270	6,352
Media & Data Network
Segment Reporting Information [Line Items]
Revenue									139,015	161,451	183,287
Adjusted EBITDA									9,707	7,746	12,205
Depreciation and amortization									(4,376)	(4,303)	(3,820)
Stock-based compensation									(122)	(63)	(320)
Capital expenditures									569	627	1,632
All Other
Segment Reporting Information [Line Items]
Revenue									244,759	330,534	346,594
Adjusted EBITDA									30,755	37,618	38,307
Depreciation and amortization									(7,478)	(8,695)	(12,980)
Stock-based compensation									(304)	(374)	(755)
Capital expenditures									966	2,729	3,985
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Adjusted EBITDA									(27,220)	(30,601)	(38,761)
Depreciation and amortization									(1,380)	(868)	(762)
Stock-based compensation									(2,982)	(1,880)	(4,659)
Capital expenditures									$ 33,694	$ 36	$ 67

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