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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Noncontrolling Interest [Line Items] |  |
Net loss attributable to MDC Partners Inc. | $ 1,003 | $ (113)
Increase (decrease) in MDC Partners Inc. paid-in capital for purchase of redeemable noncontrolling interests and noncontrolling interests | (503) | 0
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interests | (500) | 113
MDC Partners Inc. Shareholders' Deficit |  |
Noncontrolling Interest [Line Items] |  |
Net loss attributable to MDC Partners Inc. | 1,003 | (113)
Increase (decrease) in MDC Partners Inc. paid-in capital for purchase of redeemable noncontrolling interests and noncontrolling interests | $ (503) | $ 0

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