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Discontinued Operations (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
May. 31, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net loss from discontinued operations attributable to MDC Partners Inc., net of taxes $ (1,316,000) $ (1,369,000) $ (6,281,000) $ (2,976,000)    
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Including Discontinued Operation, Consideration         $ 0  
Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Revenue 0 17,499,000 27,025,000 53,577,000    
Operating loss 0 (1,289,000) (322,000) (2,586,000)    
Other expense 0 (80,000) (752,000) (390,000)    
Loss on disposal (1,316,000) 0 (5,207,000) 0    
Net loss from discontinued operations attributable to MDC Partners Inc., net of taxes (1,316,000) $ (1,369,000) (6,281,000) $ (2,976,000)    
Discontinued Operations, Held-for-sale [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Including Discontinued Operation, Assets $ 0   $ 0      
Disposal Group, Including Discontinued Operation, Other Assets, Current           $ 5,591,000
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent           $ 16,409,000