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CONDENSED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands | Total | Common Stock Common Class A | Common Stock Common Class B | Share Capital To Be Issued [Member] | Share Capital To Be Issued [Member] Common Class A | Additional Paid-in Capital | Charges in Excess of Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | Parent [Member] | Noncontrolling Interest [Member] | Contingent Consideration, Liability Settlements [Domain] | Contingent Consideration, Liability Settlements [Domain] Parent [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, To be Issued |  |  |  |  | 0 |  |  |  |  |  |  |  |
Common Stock, Value, To be Issued |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2015 | $ (487,073) | $ 269,841 | $ 1 | $ 0 |  | $ 0 | $ (315,261) | $ (526,990) | $ 6,257 | $ (566,152) | $ 79,079 |  |
Balance (in shares) at Dec. 31, 2015 |  | 49,986,704.5 | 3,754.5 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | (22,120) | $ 0 | $ 0 | 0 |  | 0 | 0 | (22,120) | 0 | (22,120) | 0 |  |
Other Comprehensive income (loss) | (10,685) | $ 0 | 0 | 0 |  | 0 | 0 | 0 | (12,484) | (12,484) | 1,799 |  |
Stock Issued During Period, Restricted Stock and Stock Options, Net of Forfeitures |  | 242,124 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock and Stock Options, Net of Forfeitures |  | $ 2,930 |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted stock | 0 |  | $ 0 | $ 0 |  | (2,930) | 0 | 0 | 0 | 0 | 0 |  |
Stock Issued During Period, Shares, New Issues |  | 237,013 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 5,585 |  |  |  |  |  |  |  |  |  | $ 7,945 | $ 7,945
Stock Authorized During Period, Shares, To be Issued |  |  |  |  | 100,000 |  |  |  |  |  |  |  |
Stock Authorized During Period, Value, To be Issued |  |  |  |  | $ 2,360 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 0 | 0 |  |  |  |  |  |  |  |  |
Shares acquired and cancelled | (2,474) | $ (2,474) | $ 0 | $ 0 |  | 0 | 0 | 0 | 0 | (2,474) | 0 |  |
Shares acquired and cancelled (in shares) |  | (116,786) | 0 | 0 |  |  |  |  |  |  |  |  |
Stock-based compensation | 5,290 | $ 0 | $ 0 | $ 0 |  | 5,290 | 0 | 0 | 0 | 5,290 | 0 |  |
Changes in redemption value of redeemable noncontrolling interests |  | 0 | 0 | 0 |  |  | 0 | 0 | 0 |  | 0 |  |
Temporary Equity, Accretion to Redemption Value | 4,141 |  |  |  |  | 4,141 |  |  |  | 4,141 |  |  |
Noncontrolling Interest, Increase from Business Combination | 3,844 |  |  |  |  | 23,018 |  |  |  | 23,018 | (19,174) |  |
Changes in noncontrolling interests and redeemable noncontrolling interest from step-up transactions |  |  |  |  |  |  |  |  |  | (19,174) |  |  |
Dividends paid and to be paid | (21,581) | 0 | 0 | 0 |  | (21,581) | 0 | 0 | 0 | (21,581) | 0 |  |
Transfer to charges in excess of capital | 0 | 0 | 0 | $ 0 |  | (7,938) | 7,938 | 0 | 0 | 0 | 0 |  |
Balance at Jun. 30, 2016 | $ (522,713) | $ 275,882 | $ 1 |  |  | $ 0 | $ (307,323) | $ (549,110) | $ (6,227) | $ (584,417) | $ 61,704 |  |
Balance (in shares) at Jun. 30, 2016 |  | 50,349,056 | 3,755 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, To be Issued |  |  |  | 100,000 | 100,000 |  |  |  |  |  |  |  |
Common Stock, Value, To be Issued |  |  |  | $ 2,360 | $ 2,360 |  |  |  |  |  |  |  |

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