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Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Combinations [Abstract]    
Business Acquisition, Pro Forma Information [Table Text Block]  
Schedule of Net Income (Loss) Attributable to Parent and Transfers to and from Noncontrolling Interest
Changes in the Company’s ownership interests in our less than 100% owned subsidiaries during the three years ended December 31, were as follows:
Net Income (Loss) Attributable to MDC Partners Inc. and
Transfers (to) from the Noncontrolling Interests
 
Year Ended December 31,
  
2017
 
2016
 
2015
Net income (loss) attributable to MDC Partners Inc.
$
241,848

 
$
(45,839
)
 
$
(35,454
)
Transfers (to) from the noncontrolling interests
  

 
  

 
  

Increase (decrease) in MDC Partners Inc. paid-in capital for purchase of equity interests in excess of noncontrolling interests and redeemable noncontrolling interests
2,315

 
22,776

 
(42,780
)
Net transfers (to) from noncontrolling interests
$
2,315

 
$
22,776

 
$
(42,780
)
Change from net income (loss) attributable to MDC Partners Inc. and transfers (to) from noncontrolling interests
$
244,163

 
$
(23,063
)
 
$
(78,234
)