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Income (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Class of Stock [Line Items]        
Net loss attributable to MDC Partners Inc. $ 6,106 $ (595) $ 11,116 $ 407
Numerator        
Net income (loss) attributable to MDC Partners Inc. common shareholders 1,655 (4,104) 2,576 (6,542)
Denominator        
Net income (loss) attributable to MDC Partners Inc. common shareholders - Diluted $ 1,675 $ (4,104) $ 2,602 $ (6,542)
Denominator for basic income (loss) per common share - weighted average common shares 75,078,755 72,528,455 74,240,447 72,463,058
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions 78,459,483 72,528,455 77,001,526 72,463,058
Earnings per share, basic $ 0.02 $ (0.06) $ 0.03 $ (0.09)
Earnings per share, diluted $ 0.02 $ (0.06) $ 0.03 $ (0.09)
MDC Partners Inc. Shareholders' Deficit        
Class of Stock [Line Items]        
Net loss attributable to MDC Partners Inc. $ 6,106   $ 11,116  
Convertible Preference Shares        
Denominator        
Adjustment to net income allocated to convertible preference shares 20 $ 0 26 $ 0
Series 4 Convertible Preferred Stock | Convertible Preference Shares        
Numerator        
Accretion on and net income allocated to convertible preference shares (3,798) (3,509) (7,522) (6,949)
Net income allocated to convertible preference shares $ (653) $ 0 $ (1,018) $ 0
Denominator        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 308,800 2,912,436 1,653,634 2,912,436