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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

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