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Acquisitions and Dispositions (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Apr. 02, 2018
Business Combination, Acquisition Related Costs | $ 335 | $ 242 | $ 711 | $ 476 |
Transfers to (from) the noncontrolling interest: |  |  |  |  |
Noncontrolling interest, ownership percentage by Parent (percent) | 100.00% |  | 100.00% |  |
Net loss attributable to MDC Partners Inc. | $ 3,406 | 11,253 | $ (26,010) | 687 |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions | 0 | (11,947) | 26,191 |  |
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests | 3,406 | (694) | (27,176) | (11,260) |
MDC Partners Inc. Shareholders' Deficit |  |  |  |  |
Transfers to (from) the noncontrolling interest: |  |  |  |  |
Net loss attributable to MDC Partners Inc. |  |  | (26,010) |  |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions | $ 0 | $ (11,947) | $ (1,166) | $ (11,947) |
Instrument [Domain] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 51.00%

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