PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule of Gross Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,565,968	$ 2,549,913
Accumulated Amortization	(2,112,684)	(1,999,857)
Transit, street furniture and other outdoor contractual rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	528,185	548,918
Accumulated Amortization	(440,228)	(440,284)
Customer / advertiser relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,249,128	1,226,314
Accumulated Amortization	(1,208,056)	(1,133,251)
Talent contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	164,933	161,962
Accumulated Amortization	(148,578)	(138,728)
Representation contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	77,508	77,507
Accumulated Amortization	(70,829)	(62,753)
Permanent easements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	163,317	162,920
Accumulated Amortization	0	0
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	382,897	372,292
Accumulated Amortization	$ (244,993)	$ (224,841)