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Acquisitions and Dispositions (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by Parent (percent) |  | 100.00% |  |
Period for retaining prior management after acquiring a majority interest |  | 5 years |  |
Adjustments to deferred acquisition consideration included in share-based compensation |  | $ 2,829 | $ 3,268 |
Waiver period for distributions to selling shareholders |  | 5 years |  |
Deferred acquisition consideration |  | $ 123,731 |  | $ 122,426
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions |  | (1,166) | 0 |
Noncontrolling Interest, Period Increase (Decrease) |  |  | 10,657 |
Stock-based compensation |  | 5,037 | 4,950 |
Loss on disposition of business |  |  | 1,732 |
Goodwill, Written off Related to Sale of Business Unit |  |  | 17,593 |
Net loss attributable to MDC Partners Inc. |  | (29,416) | (10,566) |
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests |  | (30,582) | $ (10,566) |
Changes in redemption value |  | (5,965) |  |
Allison & Partners LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Remaining ownership interest acquired (percent) | 24.50% |  |  |
Aggregate purchase price | $ 10,023 |  |  |
Closing cash payment | 300 |  |  |
Deferred acquisition consideration | 9,723 |  |  |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions | (8,857) |  |  |
Noncontrolling Interest, Increase from Business Combination | $ 1,166 |  |  |
Aggregate 2017 Step-up Transaction |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Closing cash payment |  | 3,858 |  |
Deferred acquisition consideration |  | 7,208 |  |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions |  | (11,965) |  |
Noncontrolling Interest, Period Increase (Decrease) |  | 397 |  |
Noncontrolling Interest, Increase from Business Combination |  | 2,315 |  |
Stock-based compensation |  | 996 |  |
Reduction in noncontrolling interests |  | 816 |  |
Noncontrolling Interest |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Changes in redemption value |  | $ (5,965) |  |

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