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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Noncontrolling Interest [Line Items] |  |  |  |
Net loss attributable to MDC Partners Inc. | $ (593) | $ 4,290 | $ 410 | $ 4,177
Decrease in MDC Partners Inc. paid-in capital for purchase of redeemable noncontrolling interests and noncontrolling interests |  |  | (503) |
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interests | 593 | (4,193) | 93 | (4,080)
MDC Partners Inc. Shareholders' Deficit |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Net loss attributable to MDC Partners Inc. | (593) | 4,290 | 410 | 4,177
Decrease in MDC Partners Inc. paid-in capital for purchase of redeemable noncontrolling interests and noncontrolling interests | $ 0 | $ (97) | $ 503 | $ 97

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