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Acquisitions and Dispositions (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Transfers to (from) the noncontrolling interest: |  |
Noncontrolling interest, ownership percentage by Parent (percent) | 100.00% |
Net loss attributable to MDC Partners Inc. | $ (29,416) | $ (10,566)
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions | (1,166) | 0
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests | (30,582) | (10,566)
MDC Partners Inc. Shareholders' Deficit |  |
Transfers to (from) the noncontrolling interest: |  |
Net loss attributable to MDC Partners Inc. | (29,416) |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions | $ (1,166) | $ 0

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