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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Common Class A	Common Class B	Common Stock Common Class A USD ($)	Common Stock Common Class B USD ($)	Share Capital to Be Issued USD ($)	Additional Paid in Capital USD ($)	Charges in Excess of Capital USD ($)	Retained Earnings [Member] USD ($)	Stock Subscription Receivable USD ($)	Accumulated Other Comprehensive Loss USD ($)	MDC Partners Inc. Shareholders’ Deficit USD ($)	Noncontrolling Interests USD ($)
Stockholders' equity, beginning balance at Dec. 31, 2011	$ (12,941)			$ 228,208	$ 1	$ 424	$ 0	$ (45,102)	$ (231,274)	$ (55)	$ (4,658)	$ (52,456)	$ 39,515
Common stock outstanding, beginning balance (in shares) at Dec. 31, 2011				43,916,112	3,755	42,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to MDC Partners	(85,439)us-gaap_NetIncomeLoss								(85,439)			(85,439)
Other Comprehensive income (loss)	(2,781)										(2,787)	(2,787)	6
Stock Appreciation Rights Exercised				100			(100)
Stock Appreciation Rights Exercised (in shares)				39,639
Issuance of restricted stock				28,860			(28,860)
Issuance of restricted stock (in shares)				3,017,151
Shares acquired and cancelled	(3,327)			(3,327)								(3,327)
Shares acquired and cancelled (in shares)				(366,380)
Options Exercised	28			28			0					28
Options Exercised (in shares)				4,730
Stock-based compensation	28,060						28,060					28,060
Changes in redemption value of redeemable noncontrolling interests	(22,912)						(22,912)					(22,912)
Decrease in noncontrolling interests and redeemable noncontrolling interests from business combinations	2,060												15,980
Increase in noncontrolling interests from business acquisitions	34,481						13,920					13,920	34,481
Dividends paid and to be paid	(17,919)						(17,919)					(17,919)
Transfer to charges in excess of capital							27,811	(27,811)
Stockholders' equity, ending balance at Dec. 31, 2012	(84,810)			253,869	1	424	0	(72,913)	(316,713)	(55)	(7,445)	(142,832)	58,022
Common stock outstanding, ending balance (in shares) at Dec. 31, 2012				46,611,252	3,755	42,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to MDC Partners	(148,863)us-gaap_NetIncomeLoss								(148,863)			(148,863)
Other Comprehensive income (loss)	6,637										6,648	6,648	(11)
Equity Value Appreciation Awards				16,210			(16,210)
Equity Value Appreciation Awards (in shares)				2,201,676
Stock Appreciation Rights Exercised				387			(387)
Stock Appreciation Rights Exercised (in shares)				221,384
Issuance of restricted stock				6,006			(6,006)
Issuance of restricted stock (in shares)				651,271
Shares acquired and cancelled	(13,817)			(13,817)								(13,817)
Shares acquired and cancelled (in shares)				(593,156)
Stock-based compensation	16,083						16,083					16,083
Changes in redemption value of redeemable noncontrolling interests	(35,689)						(35,689)					(35,689)
Decrease in noncontrolling interests and redeemable noncontrolling interests from business combinations	(4,939)						11,074					11,074	(16,013)
Increase in noncontrolling interests from business acquisitions	11,090												11,090
Dividends paid and to be paid	(22,865)						(22,865)					(22,865)
Other							561
Transfer to charges in excess of capital							53,439	(53,439)
Stockholders' equity, ending balance at Dec. 31, 2013	(276,612)			262,655	1		0	(126,352)	(465,576)		(797)	(329,700)	53,088
Common stock outstanding, ending balance (in shares) at Dec. 31, 2013		49,092,427	3,755	49,092,427	3,755
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to MDC Partners	(8,846)us-gaap_NetIncomeLoss
Other	561us-gaap_StockholdersEquityOther											561
Stockholders' equity, ending balance at Mar. 31, 2014
Stockholders' equity, beginning balance at Dec. 31, 2013	(276,612)			262,655	1	424	0	(126,352)	(465,576)	(55)	(797)	(329,700)	53,088
Common stock outstanding, beginning balance (in shares) at Dec. 31, 2013		49,092,427	3,755	49,092,427	3,755	42,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to MDC Partners	(24,057)us-gaap_NetIncomeLoss								(24,057)			(24,057)
Other Comprehensive income (loss)	(8,667)										(6,955)	(6,955)	(1,712)
Issuance of restricted stock				7,661			(7,661)
Issuance of restricted stock (in shares)				761,686
Shares acquired and cancelled	(5,414)			(5,414)								(5,414)
Shares acquired and cancelled (in shares)				(216,004)
Stock Subscription Receivable	55mdca_StockSubscriptionReceipts									55		55
Stock-based compensation	9,868						9,868					9,868
Changes in redemption value of redeemable noncontrolling interests	(38,850)						(38,850)					(38,850)
Decrease in noncontrolling interests and redeemable noncontrolling interests from business combinations	(8,839)												(8,839)
Increase in noncontrolling interests from business acquisitions	41,126						(8,992)					(8,992)	50,118
Dividends paid and to be paid	(37,244)						(37,244)					(37,244)
Other	54us-gaap_StockholdersEquityOther			915		(424)	(437)					54
Other (in shares)				(42,000)		(42,000)
Transfer to charges in excess of capital							83,316	(83,316)
Stockholders' equity, ending balance at Dec. 31, 2014	$ (348,580)			$ 265,817	$ 1	$ 0	$ 0	$ (209,668)	$ (489,633)	$ 0	$ (7,752)	$ (441,235)	$ 92,655
Common stock outstanding, ending balance (in shares) at Dec. 31, 2014		49,680,109	3,755	49,680,109	3,755	0