UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Services	$ 342,907	$ 375,830	$ 1,033,828	$ 1,082,541
Operating expenses:
Cost of services sold	222,448	238,690	700,351	735,110
Office and general expenses	79,726	102,380	234,120	270,137
Depreciation and amortization	9,368	11,134	28,869	35,212
Goodwill and other asset impairment	1,944	21,008	1,944	23,325
Costs and Expenses, Total	313,486	373,212	965,284	1,063,784
Operating income	29,421	2,618	68,544	18,757
Other income (expense):
Interest expense and finance charges, net	(16,110)	(17,063)	(49,284)	(50,005)
Other, net	(431)	189	(4,559)	1,222
Foreign exchange gain (loss)	(3,973)	3,275	4,401	(9,934)
Nonoperating Income (Expense), Total	(20,514)	(13,599)	(49,442)	(58,717)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	8,907	(10,981)	19,102	(39,960)
Income tax expense (benefit)	3,457	2,986	6,292	(3,367)
Income (loss) before equity in earnings of non-consolidated affiliates	5,450	(13,967)	12,810	(36,593)
Equity in earnings of non-consolidated affiliates	63	300	352	358
Net income (loss)	5,513	(13,667)	13,162	(36,235)
Net income attributable to the noncontrolling interest	(7,265)	(2,458)	(10,737)	(5,900)
Net income (loss) attributable to MDC Partners Inc.	$ (1,752)	(16,125)	$ 2,425	$ (42,135)
Accretion on and net income allocated to convertible preference shares		$ 2,109
Basic and diluted
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.07)	$ (0.32)	$ (0.10)	$ (0.85)
Weighted Average Number of Common Shares Outstanding:
Weighted Average Number of Shares Outstanding, Basic	72,044,480	57,498,661	68,154,306	57,117,797
Weighted Average Number of Shares Outstanding, Diluted	72,044,480	57,498,661	68,154,306	57,117,797
Stock-based compensation	$ 6,026	$ 6,242	$ 12,632	$ 16,882
Cost of services sold
Weighted Average Number of Common Shares Outstanding:
Stock-based compensation	5,193	4,390	12,180	11,784
Office and general expenses
Weighted Average Number of Common Shares Outstanding:
Stock-based compensation	833	$ 1,852	$ 452	5,098
Series 4 Convertible Preferred Stock [Domain] | Preferred Stock
Other income (expense):
Accretion on and net income allocated to convertible preference shares	$ 3,306			$ 6,204