Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 21, 2017
Document Information [Line Items]
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
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
Trading Symbol	ETM
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock Shares Outstanding		33,514,932
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock Shares Outstanding		7,197,532