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Document and Entity Information (USD $) In Millions, except Share data	9 Months Ended
	Sep. 30, 2011	Nov. 01, 2011	Jun. 30, 2010
Entity Registrant Name	CUMULUS MEDIA INC
Entity Central Index Key	0001058623
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 49.5
Entity Common Stock, Shares Outstanding		141,334,800
Class A Common Stock
Entity Common Stock, Shares Outstanding		128,250,262
Class B Common Stock
Entity Common Stock, Shares Outstanding		12,439,667
Class C Common Stock
Entity Common Stock, Shares Outstanding		644,871