XML 15 R1.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Document and Entity Information
6 Months Ended
Jun. 30, 2011
Jul. 31, 2011
Common Class A Member
Jul. 31, 2011
Common Class B Member
Document Information [Line Items]      
Document Type 10-Q    
Document Period End Date Jun. 30, 2011
Amendment Flag false    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus Q2    
Entity Registrant Name Entercom Communications Corp.    
Entity Central Index Key 0001067837    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Well Known Seasoned Issuer No    
Entity Common Stock Shares Outstanding   30,891,591 7,367,532