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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net loss attributable to MDC Partners Inc. $ (14,496) $ (19,574) $ (60,891) $ (26,934)
Transfers to the noncontrolling interests:        
Increase (decrease) in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests 5,263 (6,954) 2,023 (6,450)
Decrease in MDC Partners Inc. paid-in capital from issuance of equity interest 0 0 0 (1,147)
Net transfers to (from) noncontrolling interests 5,263 (6,954) 2,023 (7,597)
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interests $ (9,233) $ (26,528) $ (58,868) $ (34,531)