Segment Data (Schedule Of Operating Segment Results) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 1,579,514,000	$ 1,630,034,000	$ 4,523,937,000	$ 4,602,736,000
Direct operating expenses	627,842,000	648,409,000	1,821,626,000	1,890,967,000
Selling, general and administrative expenses	428,967,000	427,259,000	1,269,318,000	1,260,823,000
Depreciation and amortization	166,320,000	175,865,000	505,167,000	524,798,000
Impairment charges	21,631,000	35,000	21,631,000	4,937,000
Corporate expenses	74,542,000	78,202,000	232,422,000	233,104,000
Other operating income, net	6,914,000	47,172,000	98,694,000	45,709,000
Operating income (loss)	267,126,000	347,436,000	772,467,000	733,816,000
Capital expenditures	67,615,000	53,587,000	192,492,000	195,008,000
Share-based compensation expense	2,991,000	2,246,000	7,918,000	8,064,000
Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	2,986,000	4,365,000	10,429,000	13,525,000
iHM [Member]
Segment Reporting Information [Line Items]
Revenue	846,865,000	830,509,000	2,385,367,000	2,307,193,000
Direct operating expenses	253,848,000	244,945,000	709,503,000	683,950,000
Selling, general and administrative expenses	272,349,000	259,283,000	800,221,000	763,308,000
Depreciation and amortization	59,408,000	59,359,000	179,721,000	178,914,000
Impairment charges	0	0	0	0
Corporate expenses	0	0	0	0
Other operating income, net	0	0	0	0
Operating income (loss)	261,260,000	266,922,000	695,922,000	681,021,000
Capital expenditures	13,533,000	9,336,000	40,860,000	30,020,000
Share-based compensation expense	0	0	0	0
iHM [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	0	10,000	0	10,000
Americas Outdoor Advertising [Member]
Segment Reporting Information [Line Items]
Revenue	347,336,000	350,464,000	984,485,000	985,420,000
Direct operating expenses	149,072,000	151,550,000	445,018,000	448,789,000
Selling, general and administrative expenses	59,539,000	60,994,000	172,522,000	175,811,000
Depreciation and amortization	50,121,000	51,303,000	151,574,000	150,862,000
Impairment charges	0	0	0	0
Corporate expenses	0	0	0	0
Other operating income, net	0	0	0	0
Operating income (loss)	88,604,000	86,617,000	215,371,000	209,958,000
Capital expenditures	18,557,000	22,392,000	50,916,000	60,519,000
Share-based compensation expense	0	0	0	0
Americas Outdoor Advertising [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	347,000	721,000	2,510,000	2,791,000
International Outdoor Advertising [Member]
Segment Reporting Information [Line Items]
Revenue	348,941,000	392,330,000	1,049,654,000	1,173,830,000
Direct operating expenses	223,644,000	249,284,000	663,011,000	746,702,000
Selling, general and administrative expenses	73,020,000	78,619,000	219,689,000	237,023,000
Depreciation and amortization	41,564,000	47,775,000	124,961,000	143,995,000
Impairment charges	0	0	0	0
Corporate expenses	0	0	0	0
Other operating income, net	0	0	0	0
Operating income (loss)	10,713,000	16,652,000	41,993,000	46,110,000
Capital expenditures	28,665,000	19,448,000	85,522,000	72,086,000
Share-based compensation expense	0	0	0	0
International Outdoor Advertising [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Other [Member]
Segment Reporting Information [Line Items]
Revenue	39,358,000	61,096,000	114,860,000	149,818,000
Direct operating expenses	3,174,000	5,103,000	9,611,000	17,839,000
Selling, general and administrative expenses	25,149,000	30,245,000	81,798,000	91,883,000
Depreciation and amortization	5,896,000	8,389,000	21,173,000	25,763,000
Impairment charges	0	0	0	0
Corporate expenses	0	0	0	0
Other operating income, net	0	0	0	0
Operating income (loss)	5,139,000	17,359,000	2,278,000	14,333,000
Capital expenditures	1,444,000	1,235,000	4,592,000	4,121,000
Share-based compensation expense	0	0	0	0
Other [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	2,639,000	3,634,000	7,919,000	10,724,000
Corporate and other reconciling items [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Direct operating expenses	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Depreciation and amortization	9,331,000	9,039,000	27,738,000	25,264,000
Impairment charges	21,631,000	35,000	21,631,000	4,937,000
Corporate expenses	74,542,000	78,212,000	232,422,000	233,114,000
Other operating income, net	6,914,000	47,172,000	98,694,000	45,709,000
Operating income (loss)	(98,590,000)	(40,114,000)	(183,097,000)	(217,606,000)
Capital expenditures	5,416,000	1,176,000	10,602,000	28,262,000
Share-based compensation expense	2,991,000	2,246,000	7,918,000	8,064,000
Corporate and other reconciling items [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(2,986,000)	(4,365,000)	(10,429,000)	(13,525,000)
Direct operating expenses	(1,896,000)	(2,473,000)	(5,517,000)	(6,313,000)
Selling, general and administrative expenses	(1,090,000)	(1,882,000)	(4,912,000)	(7,202,000)
Depreciation and amortization	0	0	0	0
Impairment charges	0	0	0	0
Corporate expenses	0	(10,000)	0	(10,000)
Other operating income, net	0	0	0	0
Operating income (loss)	0	0	0	0
Capital expenditures	0	0	0	0
Share-based compensation expense	0	0	0	0
Eliminations [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 0