Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 20, 2017
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
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 Public Float	$ 622,828,055
Trading Symbol	ETM
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock Shares Outstanding		33,495,197
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock Shares Outstanding		7,197,532