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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Changes In Carrying Amount Of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Goodwill
Beginning balance	$ 4,051,082	$ 4,066,575
Impairment		(1,591)
Acquisitions		4,694
Foreign currency	4,624	18,847
Ending balance	4,054,100	4,051,082
iHM
Goodwill
Beginning balance	3,255,208	3,288,481
Impairment		0
Acquisitions		2,442
Foreign currency	0	0
Ending balance	3,253,602	3,255,208
Americas Outdoor Advertising
Goodwill
Beginning balance	507,819	505,478
Impairment		0
Acquisitions		2,252
Foreign currency	0	0
Ending balance	507,819	507,819
International Outdoor Advertising
Goodwill
Beginning balance	206,224	190,785
Impairment		(1,591)
Acquisitions		0
Foreign currency	4,624	18,847
Ending balance	210,848	206,224
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	(1,606)	(37,532)
Dispositions | iHM
Goodwill
Dispositions and assets held for sale	(1,606)	(35,715)
Dispositions | Americas Outdoor Advertising
Goodwill
Dispositions and assets held for sale	0	0
Dispositions | International Outdoor Advertising
Goodwill
Dispositions and assets held for sale	0	(1,817)
Dispositions | Other
Goodwill
Dispositions and assets held for sale	$ 0	0
Assets held for sale
Goodwill
Dispositions and assets held for sale		(89)
Assets held for sale | iHM
Goodwill
Dispositions and assets held for sale		0
Assets held for sale | Americas Outdoor Advertising
Goodwill
Dispositions and assets held for sale		(89)
Assets held for sale | International Outdoor Advertising
Goodwill
Dispositions and assets held for sale		0
Assets held for sale | Other
Goodwill
Dispositions and assets held for sale		$ 0

X

- Definition

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.

+ References

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)
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+ References

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-Publisher FASB
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Publisher FASB
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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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