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Loss per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Numerator |  |  |  |  |  |  |  |  |  |  |
Numerator for diluted loss per common share loss from continuing operations | $ (22,104) | $ (12,392) | $ (15,811) | $ (23,692) | $ (54,687) | $ (16,815) | $ 4,531 | $ (6,149) | $ (73,999) | $ (73,120) | $ (177)
Net income attributable to the non-controlling 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 |  |  |  |  |  |  |  |  | 0 | 0 | 0
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 |  |  |  |  |  |  |  |  | 0 | 0 | 0
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 | $ (0.76) | $ (0.44) | $ (0.57) | $ (0.84) | $ (1.93) | $ (0.65) | $ 0.06 | $ (0.28) | $ (2.60) | $ (2.80) | $ (0.38)
Diluted loss per common share from continuing operations | $ (0.76) | $ (0.44) | $ (0.57) | $ (0.84) | $ (1.93) | $ (0.65) | $ 0.05 | $ (0.28) | $ (2.60) | $ (2.80) | $ (0.38)

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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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- 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 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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=6943989&loc=d3e3602-108585 Reference 4: 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=6880815&loc=d3e20235-122688 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph b(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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