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Acquisitions and Dispositions (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 07, 2018 | Jul. 01, 2018 | Apr. 02, 2018 | Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value |  |  |  |  | $ 57,193,000 |  |  | $ 57,193,000 |  | $ 62,886,000 | $ 60,180,000
Noncontrolling interest, ownership percentage by Parent (percent) |  |  |  |  | 100.00% |  |  | 100.00% |  |  |
Adjustments to deferred acquisition consideration included in share-based compensation |  |  |  |  | $ 3,076,000 | $ 3,160,000 |  | $ 7,758,000 | $ 7,080,000 |  |
Goodwill |  |  |  |  | 843,180,000 |  |  | 843,180,000 |  | 835,935,000 |
Deferred acquisition consideration |  |  |  |  | 94,729,000 |  |  | 94,729,000 |  | 122,426,000 |
Business acquisitions and step-up transactions |  |  |  |  |  |  |  | 19,219,000 |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  |  | 0 |  | 1,666,000 |
Stock-based compensation |  |  |  |  | 6,242,000 | 6,380,000 |  | 16,882,000 | 16,870,000 |  |
Net loss attributable to MDC Partners Inc. |  |  |  |  | (16,125,000) | 18,493,000 |  | (42,135,000) | 19,180,000 |  |
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests |  |  |  |  | (11,150,000) | 18,156,000 |  | (38,326,000) | 21,495,000 |  |
Changes in redemption value |  |  |  |  |  |  |  | (5,965,000) |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | 232,000 | 216,000 |  | 943,000 | 693,000 |  |
Aggregate 2018 Step-up Transaction [Member] [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  | $ 3,279,000 |  |  |  |  |  |  |  |
Allison & Partners LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  | 24.50% |  |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 10,023,000 |  |  |  |  |  |  |
Closing cash payment |  |  |  | 300,000 |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  | 9,723,000 |  |  |  |  |  |  |
Business acquisitions and step-up transactions |  |  |  | (8,857,000) |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  | $ 1,166,000 |  |  |  |  |  |  |
Aggregate 2017 Step-up Transaction |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  |  |  |  |  | $ 3,352,000 |  |  |  |
Deferred acquisition consideration |  |  |  |  |  |  | 7,208,000 |  |  |  |
Business acquisitions and step-up transactions |  |  |  |  |  |  | (11,947,000) |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  |  | 2,652,000 |  |  |  |
Stock-based compensation |  |  |  |  |  |  | 997,000 |  |  |  |
Reduction in noncontrolling interests |  |  |  |  |  |  | $ 269,000 |  |  |  |
Aggregate 2017 Dispositions [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on disposition of business |  |  |  |  |  |  |  |  |  | 1,424,000 |
Goodwill, Written off Related to Sale of Business Unit |  |  |  |  |  |  |  |  |  | 17,593 |
Noncontrolling Interest, Decrease from Deconsolidation |  |  |  |  |  |  |  |  |  | $ 10,657 |
Parent [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. |  |  |  |  |  |  |  | $ (42,135,000) |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  |  |  |  | 1,011,561 |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Changes in redemption value |  |  |  |  |  |  |  | $ (5,965,000) |  |  |
OneChocolate [Domain] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) | 100.00% |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 3,231,000 |  |  |  |  |  |  |  |  |  |
Doner [Domain] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  | 14.90% |  |  |  |  |  |  |  |  |
Source [Domain] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  | 3.00% |  |  |  |  |  |  |  |  |
Doner and Source [Domain] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 7,618,000 |  |  |  |  |  |  |  |  |
Business acquisitions and step-up transactions |  | (11,946,000) |  |  |  |  |  |  |  |  |
Reduction in noncontrolling interests |  | $ 933,000 |  |  |  |  |  |  |  |  |
Instrument [Domain] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  | 51.00% |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other |  |  | $ 10,304,000 |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 23,130,000 |  |  |  |  |  |  |  |
Goodwill |  |  | 29,514,000 |  |  |  |  |  |  |  |
Aggregate purchase price |  |  | 35,591,000 |  |  |  |  |  |  |  |
Closing cash payment |  |  | 28,561,000 |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  | $ 27,357,000 |  |  |  |  |  |  |  |
Common Class A [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  |  |  | 7,030,000 | 28,727,000 |  |
Common Class A [Member] | Instrument [Domain] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  | 1,011,561 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  | $ 7,030,000 |  |  |  |  |  |  |  |
Contingent Payment [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  |  |  | $ 11,003,000 | $ (2,462,000) |  | $ 8,522,000 | $ 12,152,000 |  |

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