PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule of Changes in the Carrying Amount of Goodwill (Detail) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill
Beginning balance	$ 4,066,575,000	$ 4,128,887,000
Impairment	(1,591,000)	(7,274,000)
Acquisitions	4,694,000
Foreign currency	18,847,000	(7,049,000)
Ending balance	4,051,082,000	4,066,575,000	$ 4,128,887,000
iHM
Goodwill
Beginning balance	3,288,481,000	3,288,481,000
Impairment	0	0
Acquisitions	2,442,000
Foreign currency	0	0
Ending balance	3,255,208,000	3,288,481,000	3,288,481,000
Americas Outdoor Advertising
Goodwill
Beginning balance	515,414,000	534,683,000
Impairment	0	0
Acquisitions	2,252,000
Foreign currency	777,000	(1,998,000)
Ending balance	518,532,000	515,414,000	534,683,000
International Outdoor Advertising
Goodwill
Beginning balance	180,849,000	223,892,000
Impairment	(1,591,000)	(7,274,000)	0
Acquisitions	0
Foreign currency	18,070,000	(5,051,000)
Ending balance	195,511,000	180,849,000	223,892,000
Other
Goodwill
Beginning balance	81,831,000	81,831,000
Impairment	0	0
Acquisitions	0
Foreign currency	0	0
Ending balance	81,831,000	81,831,000	$ 81,831,000
Disposed of by sale
Goodwill
Dispositions/Assets held for sale	(37,532,000)	(37,652,000)
Disposed of by sale \| iHM
Goodwill
Dispositions/Assets held for sale	(35,715,000)	0
Disposed of by sale \| Americas Outdoor Advertising
Goodwill
Dispositions/Assets held for sale	0	(6,934,000)
Disposed of by sale \| International Outdoor Advertising
Goodwill
Dispositions/Assets held for sale	(1,817,000)	(30,718,000)
Disposed of by sale \| Other
Goodwill
Dispositions/Assets held for sale	0	0
Held for sale
Goodwill
Dispositions/Assets held for sale	89,000	(10,337,000)
Held for sale \| iHM
Goodwill
Dispositions/Assets held for sale	0	0
Held for sale \| Americas Outdoor Advertising
Goodwill
Dispositions/Assets held for sale	89,000	(10,337,000)
Held for sale \| International Outdoor Advertising
Goodwill
Dispositions/Assets held for sale	0	0
Held for sale \| Other
Goodwill
Dispositions/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
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 350
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-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
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