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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Gross Carrying Amount and Accumulated Amortization for Other Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,535,667	$ 2,549,913
Accumulated Amortization	(2,103,170)	(1,999,857)
Transit, street furniture and other outdoor contractual rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	533,274	548,918
Accumulated Amortization	(440,452)	(440,284)
Customer / advertiser relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,226,329	1,226,314
Accumulated Amortization	(1,205,662)	(1,133,251)
Talent contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	161,962	161,962
Accumulated Amortization	(146,978)	(138,728)
Representation contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	77,507	77,507
Accumulated Amortization	(68,976)	(62,753)
Permanent easements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	162,920	162,920
Accumulated Amortization	0	0
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	373,675	372,292
Accumulated Amortization	$ (241,102)	$ (224,841)

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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