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Acquisitions - Schedule of Net Income (Loss) Attributable to Parent and Transfers (to) from Noncontrolling Interest (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Combinations [Abstract]                      
Net Loss attributable to MDC Partners Inc. $ (26,759)us-gaap_NetIncomeLoss $ (4,922)us-gaap_NetIncomeLoss $ 16,470us-gaap_NetIncomeLoss $ (8,846)us-gaap_NetIncomeLoss $ (94,321)us-gaap_NetIncomeLoss $ (21,200)us-gaap_NetIncomeLoss $ 9,816us-gaap_NetIncomeLoss $ (43,158)us-gaap_NetIncomeLoss $ (24,057)us-gaap_NetIncomeLoss $ (148,863)us-gaap_NetIncomeLoss $ (85,439)us-gaap_NetIncomeLoss
Transfers (to) from the noncontrolling interest                      
Increase (Decrease) in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of noncontrolling interests and redeemable noncontrolling interests                 (8,992)mdca_NonControllingInterestIncreaseDecreaseFromBusinessCombination 11,074mdca_NonControllingInterestIncreaseDecreaseFromBusinessCombination 13,920mdca_NonControllingInterestIncreaseDecreaseFromBusinessCombination
Net transfers from (to) noncontrolling interest                 (8,992)mdca_NetTransfersToFromNonControllingInterest 11,074mdca_NetTransfersToFromNonControllingInterest 13,920mdca_NetTransfersToFromNonControllingInterest
Change from net loss attributable to MDC Partners Inc. and transfers from (to) noncontrolling interest                 $ (33,049)mdca_NetIncomeLossIncludingTransfersFromNonControllingInterest $ (137,789)mdca_NetIncomeLossIncludingTransfersFromNonControllingInterest $ (71,519)mdca_NetIncomeLossIncludingTransfersFromNonControllingInterest