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Loss Per Common Share (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
Class of Stock [Line Items]        
Net loss attributable to MDC Partners Inc. $ 3,406 $ 11,253 $ (26,010) $ 687
Numerator        
Numerator for basic loss per common share - Net loss attributable to MDC Partners Inc. common shareholders 1,133 7,960 (30,105) (1,730)
Adjustment to Net Income, Allocated to Convertible Shares 1 6 0 0
Numerator for diluted loss per common share- Net loss attributable to MDC Partners Inc. common shareholders $ 1,134 $ 7,966 $ (30,105) $ (1,730)
Denominator        
Denominator for basic income (loss) per common share - weighted average common shares 57,439,823 55,332,497 56,924,208 53,480,144
Weighted Average Number Diluted Shares Outstanding Adjustment 363,049 289,697 0 0
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions 57,802,872 55,622,194 56,924,208 53,480,144
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) $ 0.02 $ 0.14 $ (0.53) $ (0.03)
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) $ 0.02 $ 0.14 $ (0.53) $ (0.03)
Series 4 Convertible Preferred Stock | Convertible Preferred Stock        
Numerator        
Accretion on convertible preference shares $ (2,068) $ (1,910) $ (4,095)  
Net income allocated to convertible preference shares (205) (1,383)    
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock        
Numerator        
Accretion on convertible preference shares $ (2,273) $ (3,293) (4,095) $ (2,417)
Net income allocated to convertible preference shares     $ 0 $ 0