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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Annual Impairment Test to Indefinite-lived Intangible Assets (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) market | Dec. 31, 2017 USD ($) market | Dec. 31, 2016 USD ($) market
Regulatory Assets [Line Items] |  |  |  |
Period over which the Company forecasts revenue, expenses, and cash flows |  | 10 years |  |
Billboard permits |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Number of markets | market |  | 1 |  |
FCC licenses |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Impairment charge |  |  | $ 6.0 | $ 0.7
Number of markets | market |  |  | 1 | 1
iHM |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Impairment charge |  | $ 33.1 |  |
Americas Outdoor Advertising | Billboard permits |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Impairment charge | $ 7.8 |  |  |

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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