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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 10, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-lived intangible assets in International outdoor segment |  | $ 2,417,830,000 |  | $ 2,417,830,000 |  | $ 2,451,813,000
Total amortization expense related to definite-lived intangible assets |  | 24,200,000 | $ 49,500,000 | 116,400,000 | $ 148,200,000 |
Goodwill impairment |  | 0 |  | 0 |  | 1,591,000
International Outdoor |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-lived intangible assets in International outdoor segment |  | 0 |  | $ 0 |  |
Goodwill impairment |  |  | 1,600,000 |  | 1,600,000 | 1,591,000
iHM |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment of indefinite lived intangible assets |  | 33,100,000 | $ 6,000,000 |  | $ 6,000,000 |
Goodwill impairment |  |  |  |  |  | 0
Americas Outdoor |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment of indefinite lived intangible assets |  | $ 7,800,000 |  |  |  |
Goodwill impairment |  |  |  |  |  | $ 0
Stuff Media LLC | Subsequent Event |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Purchase price of acquired company | $ 55,000,000 |  |  |  |  |

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