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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands | Total | Convertible Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Income | MDC Partners Inc. Shareholders' Deficit | Noncontrolling Interest | Series 4 Convertible Preferred Stock [Member] Convertible Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ (257,590) | $ 90,123 |  | $ 58,579 | $ (475,526) | $ 4,720 | $ (322,104) | $ 64,514 |
Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  |  | 95,000,000
Common stock, balance (in shares) at Dec. 31, 2018 |  |  | 57,521,323 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | 2,425 |  |  |  | 2,425 |  | 2,425 |  |
Other comprehensive income | (7,505) |  |  |  |  | (7,598) | (7,598) | 93 |
Issuance of common and preference shares (in shares) |  | 50,000,000 | 14,285,714 |  |  |  |  |  |
Issuance of common and convertible preference shares | 98,620 | $ 62,623 |  | 35,997 |  |  | 98,620 |  |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 566,932 |  |  |  |  |  |
Shares acquired and cancelled | (577) |  |  | (577) |  |  | (577) |  |
Shares acquired and cancelled (in shares) |  |  | (227,552) |  |  |  |  |  |
Stock-based compensation | 1,918 |  |  | 1,918 |  |  | 1,918 |  |
Changes in redemption value of redeemable noncontrolling interests | 3,496 |  |  | 3,496 |  |  | 3,496 |  |
Business acquisitions and step-up transactions, net of tax | (745) |  |  | (745) |  |  | (745) |  |
Changes in ownership interest | (24,935) |  |  | (293) |  |  | (293) | (24,642) |
Business acquisitions and step-up transactions, net of tax |  |  |  |  |  |  | 745 |  |
Other | 25 |  |  | 11 | 5 |  | 16 | 9 |
Balance at Sep. 30, 2019 | (184,918) | 152,746 |  | 98,364 | (473,106) | (2,878) | (224,874) | 39,956 |
Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Sep. 30, 2019 |  |  | 72,146,417 |  |  |  |  |  |
Balance at Jun. 30, 2019 | (182,600) | 152,746 |  | 97,455 | (471,349) | (1,713) | (222,861) | 40,261 |
Balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Jun. 30, 2019 |  |  | 71,947,743 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | (1,752) |  |  |  | (1,752) |  | (1,752) |  |
Other comprehensive income | (1,461) |  |  |  |  | (1,165) | (1,165) | (296) |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 372,953 |  |  |  |  |  |
Shares acquired and cancelled | (499) |  |  | (499) |  |  | (499) |  |
Shares acquired and cancelled (in shares) |  |  | (174,279) |  |  |  |  |  |
Stock-based compensation | 1,409 |  |  | 1,409 |  |  | 1,409 |  |
Changes in redemption value of redeemable noncontrolling interests | 767 |  |  | 767 |  |  | 767 |  |
Business acquisitions and step-up transactions, net of tax | (648) |  |  | (648) |  |  | (648) |  |
Changes in ownership interest | (109) |  |  | (109) |  |  | (109) | 0 |
Business acquisitions and step-up transactions, net of tax |  |  |  |  |  |  | (648) |  |
Other | 25 |  |  | 11 | 5 |  | 16 | 9 |
Balance at Sep. 30, 2019 | (184,918) | 152,746 |  | 98,364 | (473,106) | (2,878) | (224,874) | 39,956 |
Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Sep. 30, 2019 |  |  | 72,146,417 |  |  |  |  |  |
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. | 4,486 |  |  |  | 4,486 |  | 4,486 |  |
Other comprehensive income | 11,171 |  |  |  |  | 11,036 | 11,036 | 135 |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 1,807,984 |  |  |  |  |  |
Shares acquired and cancelled | (861) |  |  | (861) |  |  | (861) |  |
Shares acquired and cancelled (in shares) |  |  | (407,894) |  |  |  |  |  |
Stock-based compensation | 5,243 |  |  | 5,243 |  |  | 5,243 |  |
Changes in redemption value of redeemable noncontrolling interests | (1,056) |  |  | (1,056) |  |  | (1,056) |  |
Business acquisitions and step-up transactions, net of tax | 1,626 |  |  | 1,626 |  |  | (1,626) |  |
Other | (383) |  |  | (384) | 0 | 1 | (383) | 0 |
Balance at Sep. 30, 2020 | (170,349) | 152,746 |  | 106,037 | (476,293) | 6,768 | (210,742) | 40,393 |
Balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Sep. 30, 2020 |  |  | 73,554,693 |  |  |  |  |  |
Balance at Jun. 30, 2020 | (184,603) | 152,746 |  | 98,234 | (480,368) | 4,627 | (224,761) | 40,158 |
Balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Jun. 30, 2020 |  |  | 72,587,390 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net loss attributable to MDC Partners Inc. | 4,076 |  |  |  |  |  | 4,076 |  |
Other comprehensive income | 2,375 |  |  |  |  | 2,141 | 2,141 | 234 |
Issuance of restricted stock | 0 |  |  |  |  |  |  |  |
Issuance of restricted stock (in shares) |  |  | 1,047,423 |  |  |  |  |  |
Shares acquired and cancelled | (129) |  |  | (129) |  |  | (129) |  |
Shares acquired and cancelled (in shares) |  |  | (80,120) |  |  |  |  |  |
Stock-based compensation | 4,210 |  |  | 4,210 |  |  | 4,210 |  |
Changes in redemption value of redeemable noncontrolling interests | 1,574 |  |  | 1,574 |  |  | 1,574 |  |
Business acquisitions and step-up transactions, net of tax | 2,129 |  |  | 2,129 |  |  | 2,129 |  |
Other | 19 |  |  | 19 | (1) |  | 18 | 1 |
Balance at Sep. 30, 2020 | $ (170,349) | $ 152,746 |  | $ 106,037 | $ (476,293) | $ 6,768 | $ (210,742) | $ 40,393 |
Balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  |  |  | 145,000,000
Common stock, balance (in shares) at Sep. 30, 2020 |  |  | 73,554,693 |  |  |  |  |  |

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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- Definition This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy. + References No definition available. + Details
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