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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Annual Impairment Test to Goodwill (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) market | Dec. 31, 2016 USD ($) market | Dec. 31, 2015 USD ($)
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 1,591,000 | $ 7,274,000 |
iHM |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment | 0 | 0 |
Cumulative impairments |  |  | $ 3,500,000,000
Americas Outdoor Advertising |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment | 0 | 0 |
Cumulative impairments |  |  | 2,600,000,000
International Outdoor Advertising |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 1,591,000 | $ 7,274,000 | 0
Cumulative impairments |  |  | 326,600,000
International Outdoor Advertising | Goodwill |  |  |
Goodwill [Line Items] |  |  |
Number of markets | market | 1 | 1 |
Other |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 0 | $ 0 |
Cumulative impairments |  |  | $ 212,000,000

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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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