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New Accounting Pronouncements - Adoption of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue - Services	$ 379,743	$ 390,532	$ 706,711	$ 735,232
Cost of services sold	253,390	267,822	496,420	505,385
Operating profit (loss)	30,772	26,381	16,139	34,780
Net loss attributable to MDC Partners, Inc. common shareholders	1,133	$ 7,960	$ (30,105)	$ (1,730)
Loss per common share - basic and diluted (in USD per share)			$ (0.53)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue - Services	389,471		$ 737,715
Cost of services sold	272,154		530,381
Operating profit (loss)	21,736		13,182
Net loss attributable to MDC Partners, Inc. common shareholders	$ (4,483)		$ (31,490)
Loss per common share - basic and diluted (in USD per share)	$ (0.08)		$ (0.55)
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	$ 9,728		$ 31,004
Cost of services sold	18,764		33,961
Operating profit (loss)	(9,036)		(2,957)
Net loss attributable to MDC Partners, Inc. common shareholders	$ (5,616)		$ (1,385)
Loss per common share - basic and diluted (in USD per share)	$ (0.10)		$ (0.02)

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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
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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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