v3.19.1
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Mar. 18, 2019
Jun. 29, 2018
Entity Registrant Name Ascent Capital Group, Inc.    
Entity Central Index Key 0001437106    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document fiscal period focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Smaller Reporting Company true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 32.2
Series A Common Stock      
Entity Common Stock, Shares Outstanding (in shares)   12,092,846  
Series B Common Stock      
Entity Common Stock, Shares Outstanding (in shares)   381,528