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LONG-TERM DEBT - Schedule of Long-term Debt (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 27, 2017 | Dec. 24, 2017 | Nov. 30, 2017 | Sep. 30, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jul. 10, 2017 | Feb. 07, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total Consolidated Secured Debt |  |  |  |  | $ 13,283,883,000 | $ 12,925,802,000 |  |  |
Total debt |  |  | $ 365,000,000 |  | 20,649,181,000 | 20,364,988,000 |  |  |
Long-term debt fees |  |  |  |  | (109,071,000) | (123,003,000) |  |  |
Less: current portion |  |  |  |  | 14,972,367,000 | 342,908,000 |  |  |
Total long-term debt |  |  |  |  | 5,676,814,000 | 20,022,080,000 |  |  |
Maximum borrowing capacity |  |  |  |  | 550,000,000 |  |  |  |
Draws on credit facilities |  |  |  |  | 100,000,000 | 100,000,000 | $ 350,000,000 |  |
Proceeds from long-term debt |  |  |  |  | 156,000,000 | 6,856,000 | $ 1,172,777,000 |  |
Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total Consolidated Secured Debt |  |  |  |  | 6,300,000,000 | 6,300,000,000 |  |  |
Receivables Based Credit Facility Due 2019 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total Consolidated Secured Debt |  |  |  |  | 405,000,000 | 330,000,000 |  |  |
Credit facility term |  |  | 3 years |  |  |  |  |  |
Priority Guarantee Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total Consolidated Secured Debt |  |  |  |  | 6,570,361,000 | 6,274,815,000 |  |  |
Subsidiary Revolving Credit Facility Due 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total Consolidated Secured Debt |  |  |  |  | 0 | 0 |  |  |
Other Secured Subsidiary Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total Consolidated Secured Debt |  |  |  |  | $ 8,522,000 | $ 20,987,000 |  |  |
14.0% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 14.00% | 14.00% |  |  |
Legacy Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 475,000,000 | $ 475,000,000 |  |  |
10.0% Senior Notes Due 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 47,482,000 | $ 347,028,000 |  |  |
Interest Rate |  |  |  |  | 10.00% | 10.00% |  | 10.00% |
Subsidiary Senior Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 5,300,000,000 | $ 5,150,000,000 |  |  |
Other Subsidiary Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | 24,615,000 | 27,954,000 |  |  |
Purchase accounting adjustments and original issue discount |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | (136,653,000) | (166,961,000) |  |  |
Senior Notes | 14.0% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  | $ 1,763,925,000 | 1,729,168,000 |  |  |
Interest Rate |  |  |  |  | 14.00% |  |  |  |
Secured debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term loan |  |  | $ 300,000,000 |  |  |  |  |  |
Legacy Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 475,000,000 | $ 475,000,000 |  |  |
Legacy Notes | 5.5% Senior Notes Due 2016 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  | 5.50% | 5.50% |  |  |
iHeartCommunications |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from long-term debt |  |  | 365,000,000 |  |  |  |  |  |
Credit facility term |  |  |  |  | 3 years |  |  |  |
iHeartCommunications | 10.0% Senior Notes Due 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  | $ 241,400,000
iHeartCommunications | Secured debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Term loan |  |  | 300,000,000.0 |  |  |  |  |  |
Proceeds from secured debt |  |  | $ 300,000,000 |  |  |  |  |  |
iHeartCommunications | Legacy Notes | 5.5% Senior Notes Due 2016 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  | $ 57,100,000 | $ 57,100,000 |  |  |
LIBOR | iHeartCommunications |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 4.75% |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 75,000,000.0 |  |  |  |  |
Credit facility term |  |  |  | 5 years |  |  |  |  |
Outstanding under revolving credit facility |  | $ 405,000,000 | $ 250,000,000 |  | 0 |  |  |  |
Revolving credit facility | iHeartCommunications |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 250,000,000.0 |  |  |  |  |  |
Draws on credit facilities | $ 40,000,000 | $ 40,000,000 | $ 65,000,000 |  |  |  |  |  |
Outstanding under revolving credit facility |  |  |  |  | $ 405,000,000 |  |  |  |

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