Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income (loss) attributable to MDC Partners Inc.	$ 29,560	$ 16,470	$ (2,531)	$ 7,624
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions			(41,932)
Transfers from the noncontrolling Interest:
Net transfers from noncontrolling interest	(30,282)	(1,440)	(33,199)	(6,238)
Change from net income (loss) attributable to MDC Partners Inc. and transfers to non controlling interest	(722)	15,030	(35,730)	1,386
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			(33,199)
Parent [Member]
Net income (loss) attributable to MDC Partners Inc.			(2,531)
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions	$ (30,282)	$ (1,440)	$ (33,199)	$ (6,238)