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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

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