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Segment Information (Details 1) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) operating_segment reportable_segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | reportable_segment				4
Revenue	$ 362,130	$ 379,743		$ 690,921	$ 706,711
Segment operating income (loss)	23,442	30,772		39,123	16,139
Interest expense and finance charges	(16,413)	(16,859)		(33,174)	(32,942)
Foreign exchange transaction gain (loss)	2,932	(6,549)		8,374	(13,209)
Other, net	(746)	592		(4,128)	1,033
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	9,215	7,956		10,195	(28,979)
Income tax expense (benefit)	2,088	1,977		2,835	(6,353)
Income (loss) before equity in earnings (losses) of non-consolidated affiliates	7,127	5,979		7,360	(22,626)
Equity in earnings (losses) of non-consolidated affiliates	206	(28)		289	58
Net income (loss)	7,333	5,951		7,649	(22,568)
Net income attributable to the noncontrolling interest	(3,043)	(2,545)		(3,472)	(3,442)	$ (11,785)
Net income (loss) attributable to MDC Partners Inc.	4,290	3,406	$ 3,406	4,177	(26,010)
Depreciation and amortization	10,663	11,703		19,501	24,078
Stock-based compensation	3,634	5,603		6,606	10,640
Capital expenditures	4,317	5,890		$ 7,923	9,689
Global Integrated Agencies
Segment Reporting Information [Line Items]
Number of operating segments | operating_segment				4
Revenue	154,368	158,163		$ 284,087	287,686
Segment operating income (loss)	20,720	18,352		24,491	4,760
Depreciation and amortization	4,437	4,743		8,502	12,152
Stock-based compensation	1,232	2,475		4,999	4,935
Capital expenditures	1,816	2,411		$ 3,234	4,654
Domestic Creative Agencies
Segment Reporting Information [Line Items]
Number of operating segments | operating_segment				7
Revenue	65,193	72,971		$ 132,201	139,625
Segment operating income (loss)	8,730	5,077		14,207	7,955
Depreciation and amortization	1,547	1,281		2,786	2,574
Stock-based compensation	522	1,097		986	1,507
Capital expenditures	369	569		$ 1,063	1,473
Specialized Communications
Segment Reporting Information [Line Items]
Number of operating segments | operating_segment				4
Revenue	47,170	40,304		$ 86,123	79,128
Segment operating income (loss)	6,683	6,216		13,760	9,944
Depreciation and amortization	698	992		1,265	1,959
Stock-based compensation	52	52		78	239
Capital expenditures	231	2,208		482	2,443
Media Services
Segment Reporting Information [Line Items]
Revenue	21,331	21,398		41,510	46,082
Segment operating income (loss)	991	(1,719)		(843)	(1,738)
Depreciation and amortization	794	635		1,485	1,273
Stock-based compensation	(16)	74		(16)	149
Capital expenditures	126	131		167	315
All Other
Segment Reporting Information [Line Items]
Revenue	74,068	86,907		147,000	154,190
Segment operating income (loss)	2,949	15,986		8,962	22,430
Depreciation and amortization	2,966	3,892		5,025	5,736
Stock-based compensation	652	684		940	1,341
Capital expenditures	1,757	547		2,958	772
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenue	0	0		0	0
Segment operating income (loss)	(16,631)	(13,140)		(21,454)	(27,212)
Depreciation and amortization	221	160		438	384
Stock-based compensation	1,192	1,221		(381)	2,469
Capital expenditures	$ 18	$ 24		$ 19	$ 32

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