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Investments (Narrative) (Detail) - USD ($) $ in Thousands		3 Months Ended									12 Months Ended
	Feb. 18, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Barter and trade revenues											$ 132,500	$ 77,600	$ 71,300
Reduction of "Other comprehensive income (loss)"											(808)	(3,317)	83,752
Acquisitions of investments, net											65,526	8,520
Sale of Equity Method Investment [Abstract]
Proceeds from sale of equity method investment												(236,603)
Other than temporary impairment for equity method investments											(553)	(11,473)
Income Tax Expense Benefit		$ 5,434	$ 2,841	$ 22,077	$ 56,605	$ (33,654)	$ 24,376	$ (621)	$ 68,388		$ 86,957	$ 58,489	$ (121,817)
Australian Radio Network [Member]
Percentage of ownership										50.00%			50.00%
Equity Method Ownership Percentage Disposal	50.00%
Sale of Equity Method Investment [Abstract]
Other than temporary impairment for equity method investments										$ 95,400
Equity Method Investment, Realized Gain (Loss) on Disposal	$ (2,400)
Australian Radio Network [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Sale of Equity Method Investment [Abstract]
Foreign exchange losses	$ (11,500)
Sirius XM Radio, Inc [Member]
Reduction of "Other comprehensive income (loss)"													$ 82,300
Sale of Equity Method Investment [Abstract]
Proceeds from sale of equity method investment													135,500
Equity Method Investment, Realized Gain (Loss) on Disposal													130,900
Sirius XM Radio, Inc [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Sale of Equity Method Investment [Abstract]
Income Tax Expense Benefit													$ 48,600
Three Private Companies [Member]
Barter and trade revenues		15,600
Acquisitions of investments, net		$ 36,500

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Total revenue recognized from advertising barter transactions for each income statement presented.

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