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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Acquisitions and Dispositions (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) station | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Goodwill |  | $ 4,051,082 |  | $ 4,066,575 | $ 4,128,887
Net loss on sale of joint venture |  |  | $ 12,100 |  |
Cumulative translation adjustment from sale |  |  | $ 6,300 |  |
Disposed of by sale | Americas outdoor, Indianapolis, Indiana market |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale | $ 43,100 |  |  |  |
Net gain on exchange of assets | 28,900 |  |  |  |
Disposed of by sale | Broadcast communication tower sites and related assets |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Net gain on exchange of assets |  | 15,400 |  |  |
Acquisition Of Certain Assets In Atlanta, Georgia From Fairway Media Group, LLC |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Fair value of assets acquired | 39,400 |  |  |  |
Amount of fixed assets acquired | 9,900 |  |  |  |
Amount of intangible assets acquired | 29,500 |  |  |  |
Goodwill | $ 2,300 |  |  |  |
Acquisition Of Radio Stations From Entercom Communications Corp. |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Amount of fixed assets acquired |  | 8,100 |  |  |
Amount of intangible assets acquired |  | 63,200 |  |  |
Goodwill |  | $ 2,400 |  |  |
Chattanooga, TN | Acquisition Of Radio Stations From Entercom Communications Corp. | Broadcast communication tower sites and related assets |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of radio stations exchanged | station |  | 4 |  |  |
Richmond, VA | Acquisition Of Radio Stations From Entercom Communications Corp. | Broadcast communication tower sites and related assets |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of radio stations exchanged | station |  | 6 |  |  |
Boston, MA | Acquisition Of Radio Stations From Entercom Communications Corp. | Broadcast communication tower sites and related assets |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of radio stations acquired | station |  | 4 |  |  |
Seattle, WA | Acquisition Of Radio Stations From Entercom Communications Corp. | Broadcast communication tower sites and related assets |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of radio stations acquired | station |  | 3 |  |  |

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