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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net loss attributable to MDC Partners Inc. $ (43,158) $ (26,281)
Transfers to the noncontrolling interest:    
Decrease in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of noncontrolling interests 0 (1,263)
Decrease in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests (1,059) 0
Net transfers from noncontrolling interest (1,059) (1,263)
Change from net loss attributable to MDC Partners Inc. and transfers to noncontrolling interest $ (44,217) $ (27,544)