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DOCUMENT AND ENTITY INFORMATION
 9 Months Ended
Sep. 30, 2012
Oct. 30, 2012
Common Class A [Member]
Oct. 30, 2012
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   31,805,074 2,503
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Sep. 30, 2012    
Document Fiscal Period Focus Q3    
Document Fiscal Year Focus 2012