ACQUISITIONS AND DISPOSITIONS: (Details Textual) (USD $)	3 Months Ended			12 Months Ended							12 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2011	Dec. 31, 2012	Apr. 14, 2011	Mar. 31, 2013 Tv One Llc [Member]	Apr. 25, 2011 Tv One Llc [Member]	Feb. 28, 2011 Tv One Llc [Member]	Mar. 31, 2013 Reach Media [Member] Previous Holding Percentage [Member]	Mar. 31, 2013 Reach Media [Member] Current Holding Percentage [Member]	Dec. 31, 2012 LMA	Mar. 31, 2013 Columbus Ohio Radio Stations [Member]	Feb. 28, 2011 Financial Investers [Member]	Mar. 31, 2013 Senior Notes [Member]	Dec. 31, 2012 Senior Notes [Member]	Dec. 31, 2011 Senior Notes [Member]	Feb. 25, 2011 Senior Notes [Member]
Long-term Debt, Gross	$ 822,370,000			$ 824,078,000										$ 119,000,000	$ 119,000,000	$ 119,000,000
Debt Instrument, Interest Rate, Stated Percentage																	10.00%
Private Placement Debt Offering Utilized Amount																82,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Total					61,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total					2,400,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Indefinite-Lived Intangible Assets Including Goodwill					204,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					287,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Total					225,700,000
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value					203,000,000
Noncontrolling Interest, Ownership Percentage by Parent						51.10%	51.10%		53.50%	80.00%			50.00%
Percentage Of Outstanding Membership Interest							12.40%	2.00%					15.40%
Business Combination,Recognized Identifiable Assets Acquired And Liabilities Assumed, Launch Assets					39,000,000
Business Acquisition After Tax Gain Loss Recognized			146,900,000
Percentage Of Outstanding Membership Interest Before Acquisition							36.80%
Percentage Of Outstanding Membership Interest After Acquisition							50.90%
Business Acquisition, Period Results Included in Combined Entity											18 months
Proceeds from Sale of Productive Assets, Total												4,000,000
Payments to Acquire Additional Interest in Subsidiaries				2,000,000
Disposal Group Including Discontinued Operation, Gain (Loss) on Sale of Assets	$ 893,000	$ 0