Segment Data (Schedule Of Operating Segment Results) (Detail) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 1,344,564,000us-gaap_Revenues	$ 1,342,548,000us-gaap_Revenues
Direct operating expenses	578,519,000us-gaap_DirectOperatingCosts	597,688,000us-gaap_DirectOperatingCosts
Selling, general and administrative expenses	416,188,000	414,636,000
Depreciation and amortization	170,453,000	174,871,000
Impairment charges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Corporate expenses	77,288,000	72,705,000
Other operating income, net	(8,974,000)us-gaap_OtherOperatingIncomeExpenseNet	165,000us-gaap_OtherOperatingIncomeExpenseNet
Operating income (loss)	93,142,000us-gaap_OperatingIncomeLoss	82,813,000us-gaap_OperatingIncomeLoss
Capital expenditures	56,455,000	67,408,000
Share-based compensation expense	2,524,000us-gaap_ShareBasedCompensation	3,036,000us-gaap_ShareBasedCompensation
Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	3,742,000	4,545,000
iHM [Member]
Segment Reporting Information [Line Items]
Revenue	697,801,000	670,347,000
Direct operating expenses	213,829,000	211,946,000
Selling, general and administrative expenses	261,349,000	253,345,000
Depreciation and amortization	60,742,000	60,324,000
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	161,881,000	144,732,000
Capital expenditures	11,913,000	10,292,000
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	295,863,000	290,610,000
Direct operating expenses	146,234,000	143,364,000
Selling, general and administrative expenses	55,637,000	56,368,000
Depreciation and amortization	50,340,000	49,712,000
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	43,652,000	41,166,000
Capital expenditures	16,695,000	16,444,000
Share-based compensation expense	0	0
Americas Outdoor Advertising [Member] \| Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	1,101,000	976,000
International Outdoor Advertising [Member]
Segment Reporting Information [Line Items]
Revenue	319,180,000	344,641,000
Direct operating expenses	216,737,000	238,149,000
Selling, general and administrative expenses	71,493,000	76,581,000
Depreciation and amortization	42,441,000	48,331,000
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	(11,491,000)	(18,420,000)
Capital expenditures	25,105,000	20,862,000
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	35,462,000	41,495,000
Direct operating expenses	3,398,000	6,388,000
Selling, general and administrative expenses	29,772,000	30,728,000
Depreciation and amortization	7,666,000	8,719,000
Impairment charges	0	0
Corporate expenses	0	0
Other operating income, net	0	0
Operating income (loss)	(5,374,000)	(4,340,000)
Capital expenditures	1,051,000	1,807,000
Share-based compensation expense	0	0
Other [Member] \| Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	2,641,000	3,569,000
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	9,264,000	7,785,000
Impairment charges	0	0
Corporate expenses	77,288,000	72,705,000
Other operating income, net	(8,974,000)	165,000
Operating income (loss)	(95,526,000)	(80,325,000)
Capital expenditures	1,691,000	18,003,000
Share-based compensation expense	2,524,000	3,036,000
Corporate and other reconciling items [Member] \| Intersegment [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(3,742,000)	(4,545,000)
Direct operating expenses	(1,679,000)	(2,159,000)
Selling, general and administrative expenses	(2,063,000)	(2,386,000)
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

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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