Segment Data (Schedule Of Operating Segment Results) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 1,363,505,000	$ 1,344,564,000
Direct operating expenses	568,371,000	577,692,000
Selling, general and administrative expenses	425,568,000	416,881,000
Depreciation and amortization	155,456,000	170,453,000
Impairment charges	0	0
Corporate expenses	77,879,000	77,422,000
Other operating income, net	284,463,000	(8,974,000)
Operating income (loss)	420,694,000	93,142,000
Capital expenditures	56,779,000	56,455,000
Share-based compensation expense	3,094,000	2,524,000
Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	285,000	1,101,000
iHM [Member]
Segment Reporting Information [Line Items]
Revenue	738,886,000	697,801,000
Direct operating expenses	224,062,000	213,829,000
Selling, general and administrative expenses	272,013,000	261,080,000
Depreciation and amortization	58,817,000	60,735,000
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	183,994,000	162,157,000
Capital expenditures	8,790,000	12,818,000
Share-based compensation expense	0	0
iHM [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Americas Outdoor Advertising [Member]
Segment Reporting Information [Line Items]
Revenue	282,528,000	295,863,000
Direct operating expenses	138,012,000	146,234,000
Selling, general and administrative expenses	55,329,000	55,637,000
Depreciation and amortization	46,116,000	50,340,000
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	43,071,000	43,652,000
Capital expenditures	11,292,000	16,695,000
Share-based compensation expense	0	0
Americas Outdoor Advertising [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	285,000	1,101,000
International Outdoor Advertising [Member]
Segment Reporting Information [Line Items]
Revenue	308,193,000	319,180,000
Direct operating expenses	205,682,000	216,737,000
Selling, general and administrative expenses	71,472,000	71,493,000
Depreciation and amortization	37,880,000	42,441,000
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	(6,841,000)	(11,491,000)
Capital expenditures	34,913,000	25,105,000
Share-based compensation expense	0	0
International Outdoor Advertising [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Other [Member]
Segment Reporting Information [Line Items]
Revenue	34,183,000	32,821,000
Direct operating expenses	615,000	892,000
Selling, general and administrative expenses	27,039,000	29,772,000
Depreciation and amortization	3,616,000	6,323,000
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	2,913,000	(4,166,000)
Capital expenditures	65,000	146,000
Share-based compensation expense	0	0
Other [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Corporate and other reconciling items [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Direct operating expenses	0	0
Selling, general and administrative expenses	0	0
Depreciation and amortization	9,027,000	10,614,000
Impairment charges	0	0
Corporate expenses	77,879,000	77,422,000
Other operating income, net	284,463,000	(8,974,000)
Operating income (loss)	197,557,000	(97,010,000)
Capital expenditures	1,719,000	1,691,000
Share-based compensation expense	3,094,000	2,524,000
Corporate and other reconciling items [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(285,000)	(1,101,000)
Direct operating expenses	0	0
Selling, general and administrative expenses	(285,000)	(1,101,000)
Depreciation and amortization	0	0
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	0	0
Capital expenditures	0	0
Share-based compensation expense	0	0
Eliminations [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0