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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Detail) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 15, 2016 USD ($) station | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) market | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Amortization expense |  | $ 56.8 |  | $ 60.7 | $ 112.1 | $ 123.6
Disposed of by sale | Broadcast communication tower sites and related assets |  |  |  |  |  |
Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Radio stations sold | station | 6 |  |  |  |  |
Disposal proceeds | $ 5.5 |  |  |  |  |
Gain (loss) on disposal | 2.7 |  |  |  |  |
Deferred portion of gain on asset disposal | $ 1.9 |  |  |  |  |
Disposed of by sale | Non-strategic outdoor markets |  |  |  |  |  |
Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Disposal proceeds |  |  | $ 594.0 |  |  |
Gain (loss) on disposal |  |  | $ 280.0 |  |  |
Markets sold | market |  |  | 9 |  |  |
Disposed of by sale | International Outdoor, Turkey |  |  |  |  |  |
Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain (loss) on disposal |  | (56.6) |  |  |  |
Foreign currency translation adjustments |  | $ 32.2 |  |  |  |
Held-for-sale | Outdoor market Indianapolis |  |  |  |  |  |
Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Disposal proceeds |  |  | $ 41.2 |  |  |

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