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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	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,566,051	$ 2,565,968
Accumulated Amortization	(2,126,187)	(2,112,684)
Transit, street furniture and other outdoor contractual rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	528,232	528,185
Accumulated Amortization	(443,963)	(440,228)
Customer / advertiser relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,237,115	1,249,128
Accumulated Amortization	(1,210,498)	(1,208,056)
Talent contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	164,932	164,933
Accumulated Amortization	(150,289)	(148,578)
Representation contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	77,508	77,508
Accumulated Amortization	(72,419)	(70,829)
Permanent easements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	163,341	163,317
Accumulated Amortization	0	0
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	394,923	382,897
Accumulated Amortization	$ (249,018)	$ (244,993)

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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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