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Loss per Common Share (Tables)
 12 Months Ended
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
 
$
(71,500)
 
$
(72,757)
 
$
(177)
 
Net income attributable to the noncontrolling interests
 
 
(6,738)
 
 
(8,411)
 
 
(10,378)
 
Loss attributable to MDC Partners Inc. common shareholders from continuing operations
 
 
(78,238)
 
 
(81,168)
 
 
(10,555)
 
Effect of dilutive securities
 
 
—
 
 
—
 
 
—
 
Numerator for diluted income per common share – loss  attributable to MDC Partners Inc. common shareholders from continuing operations
 
$
(78,238)
 
$
(81,168)
 
$
(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
 
$
(2.55)
 
$
(2.79)
 
$
(0.38)
 
Diluted loss per common share from continuing operations
 
$
(2.55)
 
$
(2.79)
 
$
(0.38)