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Acquisitions - Schedule of Net Income (Loss) Attributable to Parent and Transfers (to) from Noncontrolling Interest (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | $ 9,097 | $ (32,140) | $ 835 | $ (23,631) | $ (25,747) | $ (8,128) | $ 30,036 | $ (31,615) | $ (45,839) | $ (35,454) | $ (21,411)
Transfers (to) from the noncontrolling interests |  |  |  |  |  |  |  |  |  |  |
Change from net loss attributable to MDC Partners Inc. and transfers (to) from noncontrolling interests |  |  |  |  |  |  |  |  | (23,063) | (78,234) | (30,403)
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |
Transfers (to) from the noncontrolling interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Noncontrolling Interests from Business Acquisitions |  |  |  |  |  |  |  |  | $ 22,776 | $ (42,780) | $ (8,992)

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