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Noncontrolling and Redeemable Noncontrolling Interests - Changes in Noncontrolling Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ (1,752) |  | $ (16,125) | $ (16,125) | $ (42,135) | $ 2,425 | $ (42,135)
Decrease in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of redeemable noncontrolling interests and noncontrolling interests | 648 |  |  |  |  |  |
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interests | 2,400 |  | 11,150 |  |  | (1,680) | 38,326
MDC Partners Inc. Shareholders' Deficit |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. |  |  |  | $ (16,125) | $ (42,135) |  |
Decrease in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of redeemable noncontrolling interests and noncontrolling interests | $ (648) | $ 648 | $ (4,975) |  |  | $ 745 | $ (3,809)

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