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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ (233,457) | $ 4,076 | $ (593) | $ 1,003 | $ (7,678) | $ (1,752) | $ 4,290 | $ (113) | $ (228,971) | $ (5,253) | $ (130,007)
Business acquisitions and step-up transactions, net of tax |  |  |  |  |  |  |  |  | 1,626 | 1,911 | 25,550
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests |  |  |  |  |  |  |  |  | 227,345 | 3,342 | 119,867
MDC Partners Inc. Shareholders' Deficit |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. |  |  |  |  |  |  |  |  |  | (5,253) | (130,007)
Business acquisitions and step-up transactions, net of tax |  |  |  |  |  |  |  |  | $ 1,626 | $ 1,911 | $ 10,140

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