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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill |  |  |
Beginning balance | $ 4,051,082,000 | $ 4,066,575,000 |
Impairment | 0 | (1,591,000) |
Acquisitions | 77,320,000 | 4,694,000 |
Foreign currency | (8,040,000) | 18,847,000 |
Ending balance | 4,118,756,000 | 4,051,082,000 | $ 4,066,575,000
iHM |  |  |
Goodwill |  |  |
Beginning balance | 3,255,208,000 | 3,288,481,000 |
Impairment |  | 0 |
Acquisitions | 77,320,000 | 2,442,000 |
Foreign currency | 0 | 0 |
Ending balance | 3,330,922,000 | 3,255,208,000 | 3,288,481,000
Americas Outdoor Advertising |  |  |
Goodwill |  |  |
Beginning balance | 507,819,000 | 505,478,000 |
Impairment |  | 0 |
Acquisitions | 0 | 2,252,000 |
Foreign currency | 0 | 0 |
Ending balance | 507,819,000 | 507,819,000 | 505,478,000
International Outdoor Advertising |  |  |
Goodwill |  |  |
Beginning balance | 206,224,000 | 190,785,000 |
Impairment |  | (1,591,000) | (7,300,000)
Acquisitions | 0 | 0 |
Foreign currency | (8,040,000) | 18,847,000 |
Ending balance | 198,184,000 | 206,224,000 | 190,785,000
Other |  |  |
Goodwill |  |  |
Beginning balance | 81,831,000 | 81,831,000 |
Impairment |  | 0 |
Acquisitions | 0 | 0 |
Foreign currency | 0 | 0 |
Ending balance | 81,831,000 | 81,831,000 | $ 81,831,000
Disposed of by sale |  |  |
Goodwill |  |  |
Dispositions | (1,606,000) | (37,532,000) |
Disposed of by sale | iHM |  |  |
Goodwill |  |  |
Dispositions | (1,606,000) | (35,715,000) |
Disposed of by sale | Americas Outdoor Advertising |  |  |
Goodwill |  |  |
Dispositions | 0 | 0 |
Disposed of by sale | International Outdoor Advertising |  |  |
Goodwill |  |  |
Dispositions | 0 | (1,817,000) |
Disposed of by sale | Other |  |  |
Goodwill |  |  |
Dispositions | $ 0 | 0 |
Held for sale |  |  |
Goodwill |  |  |
Assets held for sale |  | 89,000 |
Held for sale | iHM |  |  |
Goodwill |  |  |
Assets held for sale |  | 0 |
Held for sale | Americas Outdoor Advertising |  |  |
Goodwill |  |  |
Assets held for sale |  | 89,000 |
Held for sale | International Outdoor Advertising |  |  |
Goodwill |  |  |
Assets held for sale |  | 0 |
Held for sale | Other |  |  |
Goodwill |  |  |
Assets held for sale |  | $ 0 |

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