Document And Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Feb. 06, 2015
Document Information [Line Items]
Entity Registrant Name	RADIO ONE, INC.
Entity Central Index Key	0001041657
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Trading Symbol	ROIA
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2014
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2014
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$ 144.2
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			2,244,551
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			2,861,843
Common Class C [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			2,928,906
Common Class D [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			42,107,610