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New Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue - Services	$ 326,968	$ 344,700
Cost of services sold	243,030	237,563
Operating profit (loss)	(14,633)	8,399
Net loss attributable to MDC Partners, Inc. common shareholders	$ (31,443)	$ (11,073)
Loss per common share - basic and diluted (in USD per share)	$ (0.56)	$ (0.21)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue - Services	$ 348,244
Cost of services sold	258,227
Operating profit (loss)	(8,554)
Net loss attributable to MDC Partners, Inc. common shareholders	$ (27,007)
Loss per common share - basic and diluted (in USD per share)	$ (0.48)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue - Services	$ 21,276
Cost of services sold	15,197
Operating profit (loss)	6,079
Net loss attributable to MDC Partners, Inc. common shareholders	$ 4,436
Loss per common share - basic and diluted (in USD per share)	$ 0.08

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Total costs related to services rendered by an entity during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256

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-Name Accounting Standards Codification
-Topic 225
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