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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, 2021 | Mar. 31, 2020
Noncontrolling Interest [Line Items] |  |
Net loss attributable to MDC Partners Inc. | $ 5,010 | $ 1,002
Business acquisitions and step-up transactions, net of tax | (330) | (503)
Change from Net income attributable to MDC Partners Inc. and transfers to noncontrolling interests | (4,680) | (499)
MDC Partners Inc. Shareholders' Deficit |  |
Noncontrolling Interest [Line Items] |  |
Business acquisitions and step-up transactions, net of tax | $ (330) | $ (503)

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