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Acquisitions and Dispositions (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 02, 2018 | Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by Parent (percent) |  |  | 100.00% |  | 100.00% |  |
Period for retaining prior management after acquiring a majority interest |  |  |  |  | 5 years |  |
Adjustments to deferred acquisition consideration included in share-based compensation |  |  | $ 3,486,000 | $ 6,315,000 | $ 2,460,000 | $ 5,728,000 |
Waiver period for distributions to selling shareholders |  |  |  |  | 5 years |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  | 1,011,561 |  |
Goodwill |  |  | 857,140,000 |  | $ 857,140,000 |  | $ 835,935,000
Deferred acquisition consideration |  |  | 83,707,000 |  | 83,707,000 |  | $ 122,426,000
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions |  |  | 0 | (11,947,000) | 26,191,000 |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  | 11,947,000 |
Stock-based compensation |  |  | 5,603,000 | 5,540,000 | 10,640,000 | 10,490,000 |
Net loss attributable to MDC Partners Inc. |  |  | 3,406,000 | 11,253,000 | (26,010,000) | 687,000 |
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests |  |  | 3,406,000 | (694,000) | (27,176,000) | (11,260,000) |
Changes in redemption value |  |  |  |  | (5,965,000) |  |
Business Combination, Acquisition Related Costs |  |  | 335,000 | 242,000 | 711,000 | 476,000 |
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 |  |  |  |  |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from 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 |  |  |  |  |  | 3,000 |
Deferred acquisition consideration |  |  |  | 7,000 |  | 7,000 |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions |  |  |  |  |  | (12,000) |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  |  | 3,000 |
Stock-based compensation |  |  |  |  |  | 1,000 |
Reduction in noncontrolling interests |  |  |  |  |  | 0 |
Parent [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase (decrease) in noncontrolling interests and redeemable noncontrolling interests from business acquisitions and step-up transactions |  |  | 0 | (11,947,000) | (1,166,000) | (11,947,000) |
Net loss attributable to MDC Partners Inc. |  |  |  |  | (26,010,000) |  |
Noncontrolling Interest |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Changes in redemption value |  |  |  |  | (5,965,000) |  |
Instrument [Domain] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) | 51.00% |  |  |  |  |  |
Business Combination, Consideration Transferred, Other | $ 10,304 |  |  |  |  |  |
Finite-lived Intangible Assets Acquired | 23,130 |  |  |  |  |  |
Goodwill | 29,514 |  |  |  |  |  |
Aggregate purchase price | 35,591 |  |  |  |  |  |
Closing cash payment | 29,000 |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination | $ 27,357 |  |  |  |  |  |
Common Class A [Member] | Common Stock [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  |  | 7,030,000 |  |
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 |  |  |  |  |  |
Contingent Payment [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  | $ (5,065,000) | $ 4,306,000 | $ (2,480,000) | $ 15,737,000 |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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