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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net Loss attributable to MDC Partners Inc. $ (94,321) $ (21,200) $ 9,816 $ (43,158) $ (24,548) $ (14,497) $ (20,113) $ (26,281) $ (148,863) $ (85,439) $ (84,674)
Transfers (to) from the noncontrolling interest                      
Increase (Decrease) in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests                 0 743 (6,328)
Increase in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of noncontrolling interests                 11,074 12,410 0
Increase (Decrease) in MDC Partners Inc. paid in capital from issuance of equity interests                 0 767 (1,147)
Net transfers from (to) noncontrolling interest                 11,074 13,920 (7,475)
Change from net loss attributable to MDC Partners Inc. and transfers from (to) noncontrolling interest                 $ (137,789) $ (71,519) $ (92,149)