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, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,549,913	$ 2,909,230
Accumulated Amortization	(1,999,857)	(2,168,722)
Transit, street furniture and other outdoor contractual rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	548,918	563,863
Accumulated Amortization	(440,284)	(426,752)
Customer / advertiser relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,226,314	1,222,519
Accumulated Amortization	(1,133,251)	(1,012,380)
Talent contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	161,962	319,384
Accumulated Amortization	(138,728)	(281,060)
Representation contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	77,507	253,511
Accumulated Amortization	(62,753)	(229,413)
Permanent easements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	162,920	159,782
Accumulated Amortization	0	0
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	372,292	390,171
Accumulated Amortization	$ (224,841)	$ (219,117)