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Income (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2019
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:
 
 
Twelve Months Ended December 31,
 
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
 
Net income (loss) attributable to MDC Partners Inc.
 
$
(4,690
)
 
$
(123,733
)
 
$
241,848

Accretion on convertible preference shares
 
(12,304
)
 
(8,355
)
 
(6,352
)
Net income allocated to convertible preference shares
 
—

 
—

 
(29,902
)
Net income (loss) attributable to MDC Partners Inc. common shareholders
 
$
(16,994
)
 
$
(132,088
)
 
$
205,594

 
 
 
 
 
 
 
Adjustment to net income allocated to convertible preference shares
 
—

 
—

 
106

Numerator for dilutive income (loss) per common share:
 
 
 
 
 
 
Net income (loss) attributable to MDC Partners Inc. common shareholders
 
$
(16,994
)
 
$
(132,088
)
 
$
205,700

Denominator:
 
 
 
 
 
 
Basic weighted average number of common shares outstanding
 
69,132,100

 
57,218,994

 
55,255,797

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
 
69,132,100

 
57,218,994

 
55,481,786

Basic
 
$
(0.25
)
 
$
(2.31
)
 
$
3.72

Diluted
 
$
(0.25
)
 
$
(2.31
)
 
$
3.71