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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) | Total | Common Class A | Common Class B | Common Stock Common Class A | Common Stock Common Class B | Share Capital to Be Issued | Additional Paid-in Capital | Charges in Excess of Capital | Retained Earnings [Member] | Stock Subscription Receivable | Accumulated Other Comprehensive Loss | MDC Partners Inc. Shareholders’ Deficit | Noncontrolling Interests | Forsman & Bodenfors AB [Domain] Common Stock Common Class A | Contingent Consideration Classified as Equity [Member] MDC Partners Inc. Shareholders’ Deficit | Contingent Consideration, Liability Settlements [Domain] | Contingent Consideration, Liability Settlements [Domain] MDC Partners Inc. Shareholders’ Deficit
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Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | $ 0 |  |  | $ 7,661,000 |  |  | $ (7,661,000) |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination | 50,118,000 |  |  |  |  |  |  |  |  |  |  |  | $ 50,118,000 |  |  |  |
Stockholders' equity, beginning balance at Dec. 31, 2013 | (290,180,000) |  |  | $ 262,655,000 | $ 1,000 | $ 424,000 | 0 | $ (126,352,000) | $ (479,144,000) | $ (55,000) | $ (797,000) | $ (343,268,000) | 53,088,000 |  |  |  |
Common stock outstanding, beginning balance (in shares) at Dec. 31, 2013 |  |  |  | 49,092,427 | 3,755 | 42,000 |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners | (21,411,000) |  |  |  |  |  |  |  | (21,411,000) |  |  | (21,411,000) |  |  |  |  |
Other comprehensive income (loss) | (8,667,000) |  |  |  |  |  |  |  |  |  | (6,955,000) | (6,955,000) | (1,712,000) |  |  |  |
Shares acquired and canceled | (5,414,000) |  |  | $ (5,414,000) |  |  |  |  |  |  |  | (5,414,000) |  |  |  |  |
Shares acquired and cancelled (in shares) |  |  |  | (216,004) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock subscription receipts | 55,000 |  |  |  |  |  |  |  |  | 55,000 |  | 55,000 |  |  |  |  |
Stock-based compensation | 9,868,000 |  |  |  |  |  | 9,868,000 |  |  |  |  | 9,868,000 |  |  |  |  |
Noncontrolling Interest, Change in Redemption Value |  |  |  |  |  |  | (38,850,000) |  |  |  |  | (38,850,000) |  |  |  |  |
Temporary Equity, Accretion to Redemption Value | (38,850,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid and to be paid | (37,244,000) |  |  |  |  |  | (37,244,000) |  |  |  |  | (37,244,000) |  |  |  |  |
Other | 54,000 |  |  | $ 915,000 |  | $ (424,000) | (437,000) |  |  |  |  | 54,000 |  |  |  |  |
Other (in shares) |  |  |  | 42,000 |  | (42,000) |  |  |  |  |  |  |  |  |  |  |
Transfer to charges in excess of capital | 0 |  |  |  |  |  | 83,316,000 | (83,316,000) |  |  |  |  |  |  |  |  |
Common stock outstanding, ending balance (in shares) at Dec. 31, 2014 |  |  |  | 49,680,109 | 3,755 | 0 |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2014 | (359,502,000) |  |  | $ 265,817,000 | $ 1,000 | $ 0 | 0 | (209,668,000) | (500,555,000) | 0 | (7,752,000) | (452,157,000) | 92,655,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  |  |  | 761,686 |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | $ (17,831,000) |  |  |  |  |  | (8,992,000) |  |  |  |  | (8,992,000) | (8,839,000) |  |  |  |
Stock Issued During Period, Shares, New Issues | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | $ 0 |  |  | 6,069,000 |  |  | (6,069,000) |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination | (51,488,000) |  |  |  |  |  | (42,780,000) |  |  |  |  | (42,780,000) | (8,708,000) |  |  |  |
Net loss attributable to MDC Partners | (35,454,000) |  |  |  |  |  |  |  |  |  |  | (35,454,000) |  |  |  |  |
Other comprehensive income (loss) | 9,141,000 |  |  |  |  |  |  |  |  |  | 14,009,000 | 14,009,000 | (4,868,000) |  |  |  |
Shares acquired and canceled | (2,388,000) |  |  | $ (2,388,000) |  |  |  |  |  |  |  | (2,388,000) |  |  |  |  |
Shares acquired and cancelled (in shares) |  |  |  | (96,777) |  |  |  |  |  |  |  |  |  |  |  |  |
Options Exercised | 224,000 |  |  | $ 343,000 |  |  | (119,000) |  |  |  |  | 224,000 |  |  |  |  |
Options Exercised (in shares) |  |  |  | 37,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 8,437,000 |  |  |  |  |  | 8,437,000 |  |  |  |  | 8,437,000 |  |  |  |  |
Temporary Equity, Accretion to Redemption Value | (22,809,000) |  |  |  |  |  | (22,809,000) |  |  |  |  | (22,809,000) |  |  |  |  |
Dividends paid and to be paid | (42,253,000) |  |  |  |  |  | (42,253,000) |  |  |  |  | (42,253,000) |  |  |  |  |
Transfer to charges in excess of capital | 0 |  |  |  |  |  | 105,593,000 | (105,593,000) |  |  |  |  |  |  |  |  |
Common stock outstanding, ending balance (in shares) at Dec. 31, 2015 |  | 49,986,705 | 3,755 | 49,986,705 | 3,755 | 0 |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2015 | $ (496,092,000) |  |  | $ 269,841,000 | $ 1,000 | $ 0 | 0 | (315,261,000) | (536,009,000) | 0 | 6,257,000 | (575,171,000) | 79,079,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  |  |  | 365,873 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Noncontrolling Interest, Increase from Business Combination | $ 8,936,000 |  |  |  |  |  | 22,776,000 |  |  |  |  | 22,776,000 | (13,840,000) |  |  |  |
Net loss attributable to MDC Partners | (45,839,000) |  |  |  |  |  |  |  |  |  |  | (45,839,000) |  |  |  |  |
Other comprehensive income (loss) | (7,687,000) |  |  |  |  |  |  |  |  |  | (8,081,000) | (8,081,000) | 394,000 |  |  |  |
Stock Appreciation Rights Exercised (in shares) |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Stock Authorized During Period, Value, To be Issued |  |  |  |  |  | $ 2,360,000 |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  |  | 425,915 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock and Stock Options, Net of Forfeitures | 0 |  |  | $ 6,615,000 |  |  | (6,615,000) |  |  |  |  | 0 |  |  |  |  |
Shares acquired and canceled | (3,350,000) |  |  | $ (3,350,000) |  |  |  |  |  |  |  | (3,350,000) |  |  |  |  |
Shares acquired and cancelled (in shares) |  |  |  | (205,876) |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 10,662,000 |  |  |  |  |  | 10,662,000 |  |  |  |  | 10,662,000 |  |  |  |  |
Temporary Equity, Accretion to Redemption Value | 9,604,000 |  |  |  |  |  | 9,604,000 |  |  |  |  | 9,604,000 |  |  |  |  |
Dividends paid and to be paid | (32,747,000) |  |  |  |  |  | (32,747,000) |  |  |  |  | (32,747,000) |  |  |  |  |
Transfer to charges in excess of capital | 0 |  |  |  |  |  | (3,680,000) | 3,680,000 |  |  |  |  |  |  |  |  |
Common stock outstanding, ending balance (in shares) at Dec. 31, 2016 |  | 52,798,303 | 3,755 | 52,798,303 | 3,755 | 100,000 |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2016 | $ (509,476,000) |  |  | $ 317,783,000 | $ 1,000 | $ 2,360,000 | $ 0 | $ (311,581,000) | $ (581,848,000) | $ 0 | $ (1,824,000) | $ (575,109,000) | $ 65,633,000 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 0 |  |  | 691,559 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 10,458,000 |  |  |  |  |  |  |  |  |  |  |  | $ 12,818,000 | $ 12,818,000
Stock Issued During Period, Shares, Acquisitions |  |  |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | $ 34,219,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,219,000 | $ 34,219,000 |  |

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