v2.4.0.6
Document and Entity Information
3 Months Ended
Mar. 31, 2013
Apr. 30, 2013
Common Class A [Member]
Apr. 30, 2013
Common Class B [Member]
Document Information [Line Items]      
Document Type 10-Q    
Document Period End Date Mar. 31, 2013    
Amendment Flag false    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus Q1    
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   31,520,147 7,197,532