PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Changes In Carrying Amount Of Goodwill (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2017	Dec. 31, 2016
Goodwill
Beginning balance	$ 4,066,575	$ 4,128,887
Impairment		(7,274)
Acquisitions	2,252
Foreign currency	13,827	(7,049)
Ending balance	4,080,926	4,066,575
iHM
Goodwill
Beginning balance	3,288,481	3,288,481
Impairment		0
Acquisitions	0
Foreign currency	0	0
Ending balance	3,288,481	3,288,481
Americas Outdoor Advertising
Goodwill
Beginning balance	515,414	534,683
Impairment		0
Acquisitions	2,252
Foreign currency	709	(1,998)
Ending balance	518,464	515,414
International Outdoor Advertising
Goodwill
Beginning balance	180,849	223,892
Impairment		(7,274)
Acquisitions	0
Foreign currency	13,118	(5,051)
Ending balance	192,150	180,849
Other
Goodwill
Beginning balance	81,831	81,831
Impairment		0
Acquisitions	0
Foreign currency	0	0
Ending balance	81,831	81,831
Dispositions
Goodwill
Dispositions and assets held for sale	(1,817)	(37,652)
Dispositions \| iHM
Goodwill
Dispositions and assets held for sale	0	0
Dispositions \| Americas Outdoor Advertising
Goodwill
Dispositions and assets held for sale	0	(6,934)
Dispositions \| International Outdoor Advertising
Goodwill
Dispositions and assets held for sale	(1,817)	(30,718)
Dispositions \| Other
Goodwill
Dispositions and assets held for sale	0	0
Assets held for sale
Goodwill
Dispositions and assets held for sale	89	(10,337)
Assets held for sale \| iHM
Goodwill
Dispositions and assets held for sale	0	0
Assets held for sale \| Americas Outdoor Advertising
Goodwill
Dispositions and assets held for sale	89	(10,337)
Assets held for sale \| International Outdoor Advertising
Goodwill
Dispositions and assets held for sale	0	0
Assets held for sale \| Other
Goodwill
Dispositions and assets held for sale	$ 0	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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