Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income (loss) attributable to MDC Partners Inc.	$ (8,604)	$ (4,922)	$ (11,135)	$ 2,702
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions			(49,154)
Transfers to (from) the noncontrolling interest:
Net transfers to (from) noncontrolling interests	(7,247)	109	(40,446)	(6,129)
Change from net income (loss) attributable to MDC Partners Inc. and transfers to noncontrolling interests	(15,851)	(4,813)	(51,581)	(3,427)
Additional Paid-in Capital [Member]
Net income (loss) attributable to MDC Partners Inc.			0
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions			(40,446)
Parent [Member]
Net income (loss) attributable to MDC Partners Inc.			(11,135)
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions	$ (7,247)	$ 109	$ (40,446)	$ (6,129)