SEGMENT DATA (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 1,600,842	$ 1,590,368	$ 2,970,803	$ 2,919,690
Direct operating expenses	636,641	616,952	1,239,309	1,189,941
Selling, general and administrative expenses	451,490	447,290	924,477	897,909
Corporate expenses	79,626	77,158	158,360	155,520
Depreciation and amortization	147,644	147,795	299,078	293,901
Other operating income, net	(289)	6,916	(3,575)	38,000
Operating income	285,152	308,089	346,004	420,419
Capital expenditures	49,918	85,593	88,621	136,620
Share-based compensation expense	2,113	2,422	4,797	5,481
Operating segments \| iHM
Segment Reporting Information [Line Items]
Revenue	853,267	884,380	1,597,835	1,641,553
Direct operating expenses	263,752	264,201	504,818	507,532
Selling, general and administrative expenses	304,587	298,842	625,857	606,993
Corporate expenses	0	0	0	0
Depreciation and amortization	56,499	58,820	114,832	116,857
Other operating income, net	0	0	0	0
Operating income	228,429	262,517	352,328	410,171
Capital expenditures	15,384	17,107	24,461	30,344
Share-based compensation expense	0	0	0	0
Operating segments \| Americas Outdoor
Segment Reporting Information [Line Items]
Revenue	299,922	300,191	555,769	560,537
Direct operating expenses	130,313	133,033	255,186	263,684
Selling, general and administrative expenses	47,824	49,439	96,774	99,817
Corporate expenses	0	0	0	0
Depreciation and amortization	43,123	42,854	87,627	85,670
Other operating income, net	0	0	0	0
Operating income	78,662	74,865	116,182	111,366
Capital expenditures	11,481	25,817	24,388	39,405
Share-based compensation expense	0	0	0	0
Operating segments \| International Outdoor
Segment Reporting Information [Line Items]
Revenue	412,058	372,128	754,922	656,508
Direct operating expenses	242,623	219,715	479,352	418,722
Selling, general and administrative expenses	77,465	76,459	155,923	141,855
Corporate expenses	0	0	0	0
Depreciation and amortization	38,683	34,095	77,248	67,247
Other operating income, net	0	0	0	0
Operating income	53,287	41,859	42,399	28,684
Capital expenditures	20,294	36,934	35,566	59,274
Share-based compensation expense	0	0	0	0
Operating segments \| Other
Segment Reporting Information [Line Items]
Revenue	38,497	35,609	66,715	64,880
Direct operating expenses	0	3	0	3
Selling, general and administrative expenses	23,613	23,580	48,435	51,221
Corporate expenses	0	0	0	0
Depreciation and amortization	3,254	3,835	7,020	7,204
Other operating income, net	0	0	0	0
Operating income	11,630	8,191	11,260	6,452
Capital expenditures	147	304	187	367
Share-based compensation expense	0	0	0	0
Corporate and other reconciling items
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Direct operating expenses	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Corporate expenses	80,482	78,068	160,239	157,331
Depreciation and amortization	6,085	8,191	12,351	16,923
Other operating income, net	(289)	6,916	(3,575)	38,000
Operating income	(86,856)	(79,343)	(176,165)	(136,254)
Capital expenditures	2,612	5,431	4,019	7,230
Share-based compensation expense	2,113	2,422	4,797	5,481
Eliminations
Segment Reporting Information [Line Items]
Revenue	(2,902)	(1,940)	(4,438)	(3,788)
Direct operating expenses	(47)	0	(47)	0
Selling, general and administrative expenses	(1,999)	(1,030)	(2,512)	(1,977)
Corporate expenses	(856)	(910)	(1,879)	(1,811)
Depreciation and amortization	0	0	0	0
Other operating income, net	0	0	0	0
Operating income	0	0	0	0
Capital expenditures	0	0	0	0
Share-based compensation expense	0	0	0	0
Intersegment revenues
Segment Reporting Information [Line Items]
Revenue	2,902	1,940	4,438	3,788
Intersegment revenues \| iHM
Segment Reporting Information [Line Items]
Revenue	47	0	61	0
Intersegment revenues \| Americas Outdoor
Segment Reporting Information [Line Items]
Revenue	2,855	1,940	4,377	3,788
Intersegment revenues \| International Outdoor
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0	0	0
Intersegment revenues \| Other
Segment Reporting Information [Line Items]
Revenue			$ 0	$ 0

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