v3.3.1.900
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Document And Entity Information [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus FY  
Trading Symbol MCCCL  
Entity Registrant Name MEDIACOM LLC  
Entity Central Index Key 0001064116  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer No  
Entity Current Reporting Status No  
Entity Voluntary Filers Yes  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding 0  
Entity Public Float   $ 0