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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Noncontrolling Interest [Line Items] |  |  |  |
Net loss attributable to MDC Partners Inc. | $ 4,076 | $ (1,752) | $ 4,486 | $ 2,425
Increase (decrease) in MDC Partners Inc. paid-in capital for purchase of redeemable noncontrolling interests and noncontrolling interests | 2,129 |  | 1,626 |
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interests | (6,205) | 2,400 | (6,112) | (1,680)
MDC Partners Inc. Shareholders' Deficit |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Net loss attributable to MDC Partners Inc. | 4,076 | (1,752) | 4,486 | 2,425
Increase (decrease) in MDC Partners Inc. paid-in capital for purchase of redeemable noncontrolling interests and noncontrolling interests | $ 2,129 | $ (648) | $ (1,626) | $ 745

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