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Acquisitions and Dispositions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Apr. 02, 2018
Business Combination, Acquisition Related Costs | $ 232 | $ 216 | $ 943 | $ 693 |
Transfers to (from) the noncontrolling interest: |  |  |  |  |
Noncontrolling interest, ownership percentage by Parent (percent) | 100.00% |  | 100.00% |  |
Net loss attributable to MDC Partners Inc. | $ (16,125) | 18,493 | $ (42,135) | 19,180 |
Business acquisitions and step-up transactions |  |  | 19,219 |  |
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests | (11,150) | 18,156 | (38,326) | 21,495 |
MDC Partners Inc. Shareholders' Deficit |  |  |  |  |
Transfers to (from) the noncontrolling interest: |  |  |  |  |
Net loss attributable to MDC Partners Inc. |  |  | (42,135) |  |
Adjustments to Additional Paid in Capital, Changes due to Business Combinations | $ 4,975 | $ (337) | $ 3,809 | $ 2,315 |
Instrument [Domain] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 51.00%

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