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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands | Total | Convertible Preference Shares | Common Shares | Common Stock and Other Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Income | MDC Partners Inc. Shareholders' Deficit | Noncontrolling Interests | Series 4 Convertible Preferred Stock [Member] Convertible Preference Shares
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2019 | $ (190,575) | $ 152,746 |  | $ 101,469 | $ (480,779) | $ (4,269) | $ (230,833) | $ 40,258 |
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Dec. 31, 2019 |  |  | 72,154,603 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | 1,002 |  |  |  | 1,002 |  |  |  |
Other comprehensive loss | 7,429 |  |  |  |  | 7,938 | 7,938 | (509) |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 587,227 |  |  |  |  |  |
Shares acquired and cancelled | (637) |  |  | (637) |  |  | (637) |  |
Shares acquired and cancelled (in shares) |  |  | (258,664) |  |  |  |  |  |
Stock-based compensation | 476 |  |  | 476 |  |  | 476 |  |
Changes in redemption value of redeemable noncontrolling interests | (1,218) |  |  | (1,218) |  |  | (1,218) |  |
Business acquisitions and step-up transactions, net of tax | (503) |  |  | (503) |  |  | (503) |  |
Other | 82 |  |  | 0 | 82 |  | 82 | 0 |
Balance at Mar. 31, 2020 | (183,944) | 152,746 |  | 99,587 | (479,695) | 3,669 | (223,693) | 39,749 |
Balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Mar. 31, 2020 |  |  | 72,483,166 |  |  |  |  |  |
Balance at Dec. 31, 2020 | (408,910) | 152,746 |  | 104,367 | (709,751) | 2,739 | (449,899) | 40,989 |
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Dec. 31, 2020 |  |  | 73,532,848 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | 5,010 |  |  |  | 5,010 |  |  |  |
Other comprehensive loss | (3,507) |  |  |  |  | (2,555) | (2,555) | (952) |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 1,322,732 |  |  |  |  |  |
Shares acquired and cancelled | (202) |  |  | (202) |  |  | (202) |  |
Shares acquired and cancelled (in shares) |  |  | (64,520) |  |  |  |  |  |
Stock-based compensation | 1,035 |  |  | 1,035 |  |  | 1,035 |  |
Changes in redemption value of redeemable noncontrolling interests | 1,681 |  |  | 1,681 |  |  | 1,681 |  |
Business acquisitions and step-up transactions, net of tax | (330) |  |  | (330) |  |  | (330) |  |
Other | (360) |  |  | (358) | 0 |  | (359) | (1) |
Balance at Mar. 31, 2021 | $ (405,583) | $ 152,746 |  | $ 106,193 | $ (704,741) | $ 183 | $ (445,619) | $ 40,036 |
Balance (in shares) at Mar. 31, 2021 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Mar. 31, 2021 |  |  | 74,791,060 |  |  |  |  |  |

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