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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 the Carrying Amount of Goodwill (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill
Beginning balance	$ 4,128,887,000	$ 4,187,424,000
Acquisitions		10,998,000
Impairment	(7,274,000)
Foreign currency	(7,049,000)	(20,353,000)
Ending balance	4,066,575,000	4,128,887,000	$ 4,187,424,000
iHM
Goodwill
Beginning balance	3,288,481,000	3,288,481,000
Acquisitions		0
Impairment	0
Foreign currency	0	0
Ending balance	3,288,481,000	3,288,481,000	3,288,481,000
Americas Outdoor Advertising
Goodwill
Beginning balance	534,683,000	584,574,000
Acquisitions		0
Impairment	0
Foreign currency	(1,998,000)	(709,000)
Ending balance	515,414,000	534,683,000	584,574,000
International Outdoor Advertising
Goodwill
Beginning balance	223,892,000	232,538,000
Acquisitions		10,998,000
Impairment	(7,274,000)	0	0
Foreign currency	(5,051,000)	(19,644,000)
Ending balance	180,849,000	223,892,000	232,538,000
Other
Goodwill
Beginning balance	81,831,000	81,831,000
Acquisitions		0
Impairment	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	(37,652,000)
Disposed of by sale \| iHM
Goodwill
Dispositions/Assets held for sale	0
Disposed of by sale \| Americas Outdoor Advertising
Goodwill
Dispositions/Assets held for sale	(6,934,000)
Disposed of by sale \| International Outdoor Advertising
Goodwill
Dispositions/Assets held for sale	(30,718,000)
Disposed of by sale \| Other
Goodwill
Dispositions/Assets held for sale	0
Held for sale
Goodwill
Dispositions/Assets held for sale	(10,337,000)	(49,182,000)
Held for sale \| iHM
Goodwill
Dispositions/Assets held for sale	0	0
Held for sale \| Americas Outdoor Advertising
Goodwill
Dispositions/Assets held for sale	(10,337,000)	(49,182,000)
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