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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interest (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. | $ (81,598) | $ (16,125) | $ 3,406 | $ (29,416) | $ 222,668 | $ 18,493 | $ 11,253 | $ (10,566) | $ (123,733) | $ 241,848 | $ (45,839)
Transfers (to) from the noncontrolling interests |  |  |  |  |  |  |  |  |  |  |
Change from net income (loss) attributable to MDC Partners Inc. and transfers (to) from noncontrolling interests |  |  |  |  |  |  |  |  | (113,593) | 244,163 | (23,063)
Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to MDC Partners Inc. |  |  |  |  |  |  |  |  | (123,733) | 241,848 | (45,839)
Transfers (to) from the noncontrolling interests |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Changes due to Business Combinations |  |  |  |  |  |  |  |  | 10,140 | 2,315 | 22,776
Net Income Loss Including Transfer from Non Controlling Interests |  |  |  |  |  |  |  |  | $ (10,140) | $ (2,315) | $ (22,776)

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