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Income (Loss) per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | The following table sets forth the computation of basic and diluted income (loss) per common share from continuing operations.
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Numerator |  |  |  |  |  |  |  |
Numerator for basic loss per common share - loss from continuing operations |  | $ | (40,617 | ) |  | $ | (23,692 | )
Net income attributable to the noncontrolling interests |  |  | (984 | ) |  |  | (1,497 | )
Loss attributable to MDC Partners Inc. common shareholders from continuing operations |  |  | (41,601 | ) |  |  | (25,189 | )
Effect of dilutive securities |  |  | — |  |  |  | — |
Numerator for diluted loss per common share – loss attributable to MDC Partners Inc. common shareholders from continuing operations |  | $ | (41,601 | ) |  | $ | (25,189 | )
Denominator |  |  |  |  |  |  |  |
Denominator for basic loss per common share – adjusted weighted shares |  |  | 31,233,893 |  |  |  | 29,889,932 |
Effect of dilutive securities |  |  | — |  |  |  | — |
Denominator for diluted loss per common share - adjusted weighted shares |  |  | 31,233,893 |  |  |  | 29,889,932 |
Basic loss per common share from continuing operations attributable to MDC Partners Inc. |  | $ | (1.33 | ) |  | $ | (0.84 | )
Diluted loss per common share from continuing operations attributable to MDC Partners Inc. |  | $ | (1.33 | ) |  | $ | (0.84 | )

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: 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 + Details
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