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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net income (loss) attributable to MDC Partners Inc. $ (20,114) $ 1,323 $ (46,395) $ (7,360)
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 (1,977) 504 (3,240) 504
Decrease in MDC Partners Inc. paid-in capital from issuance of equity interest 0 (1,147) 0 (1,147)
Net transfers to (from) noncontrolling interest (1,977) (643) (3,240) (643)
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interest $ (22,091) $ 680 $ (49,635) $ (8,003)