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Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Earnings Per Share [Abstract] |  |  |  |  |
Income from continuing operations | $ (5,166) | $ (1,868) | $ 2,489 | $ 10,474 |
Numerator |  |  |  |  |
Net income attributable to the noncontrolling interests | (2,122) | (1,685) | (7,343) | (4,796) | $ (6,890)
Income (Loss) from Continuing Operations Attributable to Parent | (7,288) | (3,553) | (4,854) | 5,678 |
Effect of dilutive securities | 0 | 0 | 0 | 0 |
Income (Loss) from Continuing Operations Attributable to Parent, Diluted | $ (7,288) | $ (3,553) | $ (4,854) | $ 5,678 |
Denominator |  |  |  |  |
Denominator for basic income (loss) per common share - weighted average common shares | 49,915,807 | 49,630,532 | 49,843,980 | 49,506,427 |
Effect of dilutive securities | 0 | 0 | 0 | 627,836 |
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions | 49,915,807 | 49,630,532 | 49,843,980 | 50,134,263 |
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ (0.15) | $ (0.07) | $ (0.10) | $ 0.11 |
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) | $ (0.15) | $ (0.07) | $ (0.10) | $ 0.11 |

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- Definition Amount of income (loss) from continuing operations attributable to the parent, and includes adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References No definition available. + Details
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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4613673-111683 + Details
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