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Income (Loss) per Common Share (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, |  | Six Months Ended June 30, |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic income (loss) per common share – income (loss) from continuing operations |  | $ | 11,611 |  | $ | (15,811) |  | $ | (29,006) |  | $ | (39,503) |
Net income attributable to the noncontrolling interests |  |  | (1,516) |  |  | (1,810) |  |  | (2,500) |  |  | (3,307) |
Income (loss) attributable to MDC Partners Inc. common shareholders from continuing operations |  |  | 10,095 |  |  | (17,621) |  |  | (31,506) |  |  | (42,810) |
Effect of dilutive securities |  |  | — |  |  | — |  |  | — |  |  | — |
Numerator for diluted income (loss) per common share – income (loss) attributable to MDC Partners Inc. common shareholders from continuing operations |  | $ | 10,095 |  | $ | (17,621) |  | $ | (31,506) |  | $ | (42,810) |
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic income (loss) per common share – adjusted weighted shares |  |  | 31,398,928 |  |  | 30,872,050 |  |  | 31,316,866 |  |  | 30,380,991 |
Effect of dilutive securities |  |  | 2,717,363 |  |  | — |  |  | — |  |  | — |
Denominator for diluted income (loss) per common share - adjusted weighted shares |  |  | 34,116,291 |  |  | 30,872,050 |  |  | 31,316,866 |  |  | 30,380,991 |
Basic income (loss) per common share from continuing operations attributable to MDC Partners Inc. |  | $ | 0.32 |  | $ | (0.57) |  | $ | (1.01) |  | $ | (1.41) |
Diluted income (loss) per common share from continuing operations attributable to MDC Partners Inc. |  | $ | 0.30 |  | $ | (0.57) |  | $ | (1.01) |  | $ | (1.41) |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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