XML 61 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document And Entity Information - shares
 3 Months Ended
Mar. 31, 2020
Apr. 17, 2020
Document Information [Line Items]    
Entity Registrant Name MDC PARTNERS INC  
Entity Central Index Key 0000876883  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Current Reporting Status Yes  
Document Type 10-Q  
Entity Small Business true  
Document Fiscal Year Focus 2020  
Document Period End Date Mar. 31, 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Common Class A    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   72,479,423
Common Class B    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,743