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DOCUMENT AND ENTITY INFORMATION	3 Months Ended
	Mar. 31, 2013	Apr. 24, 2013 Common Class A [Member]	Apr. 24, 2013 Common Class B [Member]
Entity Registrant Name	MDC PARTNERS INC
Entity Central Index Key	0000876883
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Trading Symbol	mdca
Entity Common Stock, Shares Outstanding		31,846,626	2,503
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2013

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