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
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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		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Goodwill
Beginning balance			$ 4,066,575	$ 4,128,887	$ 4,128,887
Impairment			(1,591)		(7,274)
Acquisitions			2,252
Foreign currency			18,081		(7,049)
Ending balance	$ 4,083,589		4,083,589		4,066,575
iHM
Goodwill
Beginning balance			3,288,481	3,288,481	3,288,481
Impairment			0		0
Acquisitions			0
Foreign currency			0		0
Ending balance	3,288,481		3,288,481		3,288,481
Americas Outdoor Advertising
Goodwill
Beginning balance			515,414	534,683	534,683
Impairment			0		0
Acquisitions			2,252
Foreign currency			654		(1,998)
Ending balance	518,409		518,409		515,414
International Outdoor Advertising
Goodwill
Beginning balance			180,849	223,892	223,892
Impairment	(1,600)	$ (7,300)	(1,591)	(7,300)	(7,274)
Acquisitions			0
Foreign currency			17,427		(5,051)
Ending balance	194,868		194,868		180,849
Other
Goodwill
Beginning balance			81,831	$ 81,831	81,831
Impairment			0		0
Acquisitions			0
Foreign currency			0		0
Ending balance	$ 81,831		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