UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue:
Services	$ 283,423	$ 342,907	$ 870,843	$ 1,033,828
Operating expenses:
Cost of services sold	172,531	222,448	560,856	700,351
Office and general expenses	72,512	79,726	205,075	234,120
Depreciation and amortization	9,332	9,368		28,869
Impairment and other losses	159	1,944	19,159	1,944
Costs and Expenses, Total	254,534	313,486	812,527	965,284
Operating income	28,889	29,421	58,316	68,544
Other income (expense):
Interest expense and finance charges, net	(15,266)	(16,110)	(46,819)	(49,284)
Other, net	505	(431)	22,723	(4,559)
Foreign exchange gain (loss)	2,159	(3,973)	(7,256)	4,401
Nonoperating Income (Expense), Total	(12,602)	(20,514)	(31,352)	(49,442)
Income before income taxes and equity in earnings of non-consolidated affiliates	16,287	8,907	26,964	19,102
Income tax expense	1,452	3,457	7,029	6,292
Income before equity in earnings of non-consolidated affiliates	14,835	5,450	19,935	12,810
Equity in earnings (losses) of non-consolidated affiliates	(31)	63	(829)	352
Net income	14,804	5,513	19,106	13,162
Net income attributable to the noncontrolling interest	(10,728)	(7,265)	(14,620)	(10,737)
Net income (loss) attributable to MDC Partners Inc.	4,076	(1,752)	4,486	2,425
Net income (loss) attributable to MDC Partners Inc. common shareholders	$ 360	$ (5,058)	$ (6,042)	$ (6,506)
Basic and diluted
Earnings per share, basic	$ 0	$ (0.07)	$ (0.08)	$ (0.10)
Earnings per share, diluted	$ 0	$ (0.07)	$ (0.08)	$ (0.10)
Weighted Average Number of Common Shares Outstanding:
Weighted Average Number of Shares Outstanding, Basic	73,207,619	72,044,480	72,713,257	68,154,306
Weighted Average Number of Shares Outstanding, Diluted	73,476,779	72,044,480	72,713,257	68,154,306
Series 4 Convertible Preferred Stock [Domain] | Preferred Stock
Other income (expense):
Accretion on and net income allocated to convertible preference shares	$ (3,716)	$ (3,306)		$ 8,931