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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net loss attributable to MDC Partners Inc. $ (24,548) $ (14,496) $ (20,114) $ (26,281) $ (57,740) $ (19,574) $ 1,325 $ (8,685) $ (85,439) $ (84,674) $ (15,440)
Transfers to the noncontrolling interest:                      
Increase (Decrease) in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests                 743 (6,328) (7,761)
Increase in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of noncontrolling interests.                 12,410 0 0
Increase (Decrease) in MDC Partners Inc. paid in capital from issuance of equity interests 767       (1,147)       767 (1,147) 158
Net transfers from (to) noncontrolling interest                 13,920 (7,475) (7,603)
Change from net loss attributable to MDC Partners Inc. and transfers from (to) noncontrolling interest                 $ (71,519) $ (92,149) $ (23,043)