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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Changes In Carrying Amount Of Goodwill (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Goodwill
Beginning balance			$ 4,051,082,000	$ 4,066,575,000	$ 4,066,575,000
Impairment	$ 0		0		(1,591,000)
Acquisitions					4,694,000
Foreign currency			(5,535,000)		18,847,000
Ending balance	4,043,941,000		4,043,941,000		4,051,082,000
iHM
Goodwill
Beginning balance			3,255,208,000	3,288,481,000	3,288,481,000
Impairment					0
Acquisitions					2,442,000
Foreign currency			0		0
Ending balance	3,253,602,000		3,253,602,000		3,255,208,000
Americas Outdoor
Goodwill
Beginning balance			507,819,000	505,478,000	505,478,000
Impairment					0
Acquisitions					2,252,000
Foreign currency			0		0
Ending balance	507,819,000		507,819,000		507,819,000
International Outdoor
Goodwill
Beginning balance			206,224,000	190,785,000	190,785,000
Impairment		$ (1,600,000)		(1,600,000)	(1,591,000)
Acquisitions					0
Foreign currency			(5,535,000)		18,847,000
Ending balance	200,689,000		200,689,000		206,224,000
Other
Goodwill
Beginning balance			81,831,000	$ 81,831,000	81,831,000
Impairment					0
Acquisitions					0
Foreign currency			0		0
Ending balance	$ 81,831,000		81,831,000		81,831,000
Dispositions
Goodwill
Dispositions			(1,606,000)		(37,532,000)
Dispositions | iHM
Goodwill
Dispositions			(1,606,000)		(35,715,000)
Dispositions | Americas Outdoor
Goodwill
Dispositions			0		0
Dispositions | International Outdoor
Goodwill
Dispositions			0		(1,817,000)
Dispositions | Other
Goodwill
Dispositions			$ 0		0
Assets held for sale
Goodwill
Assets held for sale					89,000
Assets held for sale | iHM
Goodwill
Assets held for sale					0
Assets held for sale | Americas Outdoor
Goodwill
Assets held for sale					89,000
Assets held for sale | International Outdoor
Goodwill
Assets held for sale					0
Assets held for sale | Other
Goodwill
Assets held for sale					$ 0

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- 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.

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