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Loss per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2012
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 loss per common share from continuing operations for the years ended December 31:
|  | 2012 |  | 2011 |  | 2010
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Numerator for diluted loss per common share – loss from continuing operations |  | $ | (73,999 | ) |  | $ | (73,120 | ) |  | $ | (177 | )
Net income attributable to the noncontrolling interests |  |  | (6,012 | ) |  |  | (8,387 | ) |  |  | (10,378 | )
Loss attributable to MDC Partners Inc. common shareholders from continuing operations |  |  | (80,011 | ) |  |  | (81,507 | ) |  |  | (10,555 | )
Effect of dilutive securities |  |  | — |  |  |  | — |  |  |  | — |
Numerator for diluted income per common share – loss attributable to MDC Partners Inc. common shareholders from continuing operations |  | $ | (80,011 | ) |  | $ | (81,507 | ) |  | $ | (10,555 | )
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic loss per common share – weighted average common shares |  |  | 30,726,773 |  |  |  | 29,120,373 |  |  |  | 28,161,144 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Dilutive potential common shares |  |  | — |  |  |  | — |  |  |  | — |
Denominator for diluted loss per common share – adjusted weighted shares and assumed conversions |  |  | 30,726,773 |  |  |  | 29,120,373 |  |  |  | 28,161,144 |
Basic loss per common share from continuing operations |  | $ | (2.60 | ) |  | $ | (2.80 | ) |  | $ | (0.38 | )
Diluted loss per common share from continuing operations |  | $ | (2.60 | ) |  | $ | (2.80 | ) |  | $ | (0.38 | )

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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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