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Loss Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Class of Stock [Line Items]        
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]    
The following table sets forth the computation of basic and diluted income (loss) per common share:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017

2016
 
2017
 
2016
Numerator
 

 

 
 
 
 
Net income (loss) attributable to MDC Partners Inc.
$
18,493


$
(32,140
)
 
$
19,180

 
$
(54,937
)
Accretion on convertible preference shares
(1,948
)

—

 
(4,365
)
 
—

Net income allocated to convertible preference shares
(2,408
)
 
—

 
(1,782
)
 
—

Numerator for basic loss per common share - Net income (loss) attributable to MDC Partners Inc. common shareholders
14,137


(32,140
)
 
13,033

 
(54,937
)
Effect of dilutive securities:




 


 


Adjustment to net income allocated to convertible preference shares
13

 
—

 
9

 
—

Numerator for diluted income (loss) per common share- Net income (loss) attributable to MDC Partners Inc. common shareholders
$
14,150


$
(32,140
)
 
$
13,042

 
$
(54,937
)
Denominator




 
 
 
 
Denominator for basic income (loss) per common share - weighted average common shares
57,566,707


52,244,819

 
53,915,536

 
50,861,890

Effect of dilutive securities:
 



 


 


Impact of stock options and non-vested stock under employee stock incentive plans
376,373

 
—

 
312,672

 
—

Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions
57,943,080


52,244,819

 
54,228,208

 
50,861,890

Basic income (loss) per common share
$
0.25


$
(0.62
)
 
$
0.24

 
$
(1.08
)
Diluted income (loss) per common share
$
0.24

 
$
(0.62
)

$
0.24

 
$
(1.08
)
  
Net loss attributable to MDC Partners Inc. $ 18,493 $ (32,140) $ 19,180 $ (54,937)
Numerator        
Income (Loss) from Continuing Operations Attributable to Parent 14,137 (32,140) 13,033 (54,937)
Adjustment to Net Income, Allocated to Convertible Shares 13 0 9 0
Income (Loss) from Continuing Operations Attributable to Parent, Diluted $ 14,150 $ (32,140) $ 13,042 $ (54,937)
Denominator        
Denominator for basic income (loss) per common share - weighted average common shares 57,566,707 52,244,819 53,915,536 50,861,890
Effect of dilutive securities: 376,373 0 312,672 0
Denominator for diluted income (loss) per common share - adjusted weighted shares and assumed conversions 57,943,080 52,244,819 54,228,208 50,861,890
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) $ 245.58 $ (615.18) $ 241.73 $ (1,080.12)
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share) $ 244.21 $ (615.18) $ 240.50 $ (1,080.12)
Series 4 Convertible Preferred Stock [Domain] | Convertible Preferred Stock [Member]        
Numerator        
Accretion on convertible preferred shares $ (1,948) $ 0 $ (4,365) $ 0
Net Income Allocated to Convertible Shares $ (2,408) $ 0 $ (1,782) $ 0