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Loss per Common Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share
The following table sets forth the computation of basic and diluted income (loss) per common share for the years ended December 31:
 
2018
 
2017
 
2016
Numerator:
  

 
  

 
  

Net income (loss) attributable to MDC Partners Inc.
$
(123,733
)
 
$
241,848

 
$
(45,839
)
Accretion on convertible preference shares
(8,355
)
 
(6,352
)
 
—

Net income allocated to convertible preference shares
—

 
(29,902
)
 
—

Net income (loss) attributable to MDC Partners Inc. common shareholders
(132,088
)
 
205,594

 
(45,839
)

 
 
 
 
 
Adjustment to net income allocated to convertible preference shares
—

 
106

 
—

Net income (loss) attributable to MDC Partners Inc. common shareholders
$
(132,088
)
 
$
205,700

 
$
(45,839
)
Denominator:
  

 
  

 
  

Basic weighted average number of common shares outstanding
57,218,994

 
55,255,797

 
51,345,807

Effect of dilutive securities:
 
 
 
 
 
Impact of stock options and non-vested stock under employee stock incentive plans
—

 
225,989

 
—

Diluted weighted average number of common shares outstanding
57,218,994

 
55,481,786

 
51,345,807

Net income (loss) attributable to MDC Partners Inc. common shareholders per common share:
 
 
 
 
 
Basic
$
(2.31
)
 
$
3.72

 
$
(0.89
)
Diluted
$
(2.31
)
 
$
3.71

 
$
(0.89
)