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Acquisitions (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2013
Business Combinations [Abstract] |  |  |  |
Net loss attributable to MDC Partners Inc. | $ (32,091)us-gaap_NetIncomeLoss | $ (8,846)us-gaap_NetIncomeLoss | $ (32,091)us-gaap_NetIncomeLoss | $ (8,846)us-gaap_NetIncomeLoss
Transfers from the noncontrolling Interest: |  |  |  |
Decrease in MDC Partners Inc. paid in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests and Noncontrolling Interests |  |  | (2,917)mdca_NonControllingInterestDecreaseFromBusinessCombination | (4,798)mdca_NonControllingInterestDecreaseFromBusinessCombination
Net transfers from noncontrolling interest |  |  | (2,917)mdca_NetTransfersToFromNonControllingInterest | (4,798)mdca_NetTransfersToFromNonControllingInterest
Change from net loss attributable to MDC Partners Inc. and transfers to non controlling interest |  |  | $ (35,008)mdca_NetIncomeLossIncludingTransfersFromNonControllingInterest | $ (13,644)mdca_NetIncomeLossIncludingTransfersFromNonControllingInterest

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