Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Business Combinations [Abstract]
Net income (loss) attributable to MDC Partners Inc.	$ 16,470	$ 9,816	$ 7,624	$ (33,342)
Transfers to (from) the noncontrolling Interest:
Increase (decrease) in MDC Partners Inc. paid in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests and Noncontrolling Interests	(1,440)	10,875	(6,238)	9,816
Net transfers to (from) noncontrolling interest	(1,440)	10,875	(6,238)	9,816
Change from Net income (loss) attributable to MDC Partners Inc. and transfers to non controlling interest	$ 15,030	$ 20,691	$ 1,386	$ (23,526)