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BASIS OF PRESENTATION (Detail) - USD ($) |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2017 | Jul. 10, 2017 | Feb. 07, 2017 | Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 286,370,000 | $ 542,910,000 | $ 845,030,000 | $ 772,678,000 |  |
Operating income (in excess of) |  |  |  |  |  |  | 1,000,000,000 | $ 1,000,000,000.0 |  |
Cash used for operating activities |  |  |  |  | 558,717,000 | 272,578,000 |  |  |  |
Cash paid for interest |  |  |  |  | 1,426,438,000 | $ 1,434,482,000 |  |  |  |
Debt maturities in 2017 |  |  |  |  | 366,900,000 |  |  |  |  |
Debt maturities in 2018 |  |  |  |  | 308,500,000 |  |  |  |  |
Debt maturities in 2019 |  |  |  |  | 8,368,900,000 |  |  |  |  |
Current portion of long-term debt |  |  |  |  | 619,003,000 |  | 342,908,000 |  |  |
Cash interest payments in the next 12 months |  |  |  |  | 1,800,000,000 |  |  |  |  |
Cash interest payment obligations |  |  |  |  | 149,533,000 |  | $ 264,170,000 |  |  |
Amount of Due from iHeartCommunications Note payable to stockholders of CCOH |  |  |  |  | 110,400,000 |  |  |  |  |
Subsidiary |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 222,400,000 |  |  |  |  |
Debt maturities in 2018 |  |  |  |  | 277,100,000 |  |  |  |  |
Receivables based credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Excess availability under receivables based credit facility |  |  |  |  | $ 85,000,000 |  |  |  |  |
11.25% Priority Guarantee Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 11.25% |  |  |  |  |
10.0% Senior Notes due 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 10.00% |  |  |  |  |
Priority Guarantee Notes | 11.25% Priority Guarantee Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 11.25% | 11.25% |  |  |  |  |  |  |
Aggregate principal amount of Notes issued |  |  | $ 241,400,000 |  |  |  |  |  |  |
Priority Guarantee Notes | 11.25% Priority Guarantee Notes Due 2021 | Subsidiary |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of notes exchanged that were held by a subsidiary |  | $ 15,600,000 |  |  |  |  |  |  |  |
Aggregate principal amount of Notes issued |  |  | 476,400,000 |  |  |  |  |  |  |
Senior Notes | 11.25% Priority Guarantee Notes Due 2021 | Subsidiary |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of Notes issued |  |  | $ 476,400,000 |  |  |  |  |  |  |
Senior Notes | 10.0% Senior Notes due 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 10.00% |  |  | 10.00% |  |  |  |  |
Senior Notes | 10.0% Senior Notes due 2018 | Subsidiary |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of Notes issued |  | $ 15,600,000 |  |  |  |  |  |  |  |
Senior Notes | 6.875% Senior Notes due June 15, 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 6.875% |  |  |  |  |
Current portion of long-term debt |  |  |  |  | $ 175,000,000 |  |  |  |  |
Senior Notes | 14% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 14.00% |  |  |  |  |
Subsequent Event | Priority Guarantee Notes | 11.25% Priority Guarantee Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 11.25% |  |  |  |  |  |
Subsequent Event | Priority Guarantee Notes | 11.25% Priority Guarantee Notes Due 2021 | Subsidiary |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of notes exchanged that were held by a subsidiary |  |  |  | $ 45,000,000 |  |  |  |  |  |
Subsequent Event | Priority Guarantee Notes | 10.0% Senior Notes due 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of Notes issued |  |  |  | $ 45,000,000 |  |  |  |  |  |
Subsequent Event | Receivables based credit facility | Receivables based credit facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding under receivables based credit facility | $ 365,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Receivables based credit facility | Receivables based credit facility | Subsidiary |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding under receivables based credit facility | 365,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Senior Notes | 10.0% Senior Notes due 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 10.00% |  |  |  |  |  |
Current portion of long-term debt | $ 51,500,000 |  |  |  |  |  |  |  |  |
Period to refinance or extend the maturity of receivables based credit facility | 12 months |  |  |  |  |  |  |  |  |
Subsequent Event | Senior Notes | 6.875% Senior Notes due June 15, 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | $ 175,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Senior Notes | 14% Senior Notes Due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate | 14.00% |  |  |  |  |  |  |  |  |
Current portion of long-term debt | $ 24,800,000 |  |  |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Cash interest payment obligations |  |  |  |  |  |  |  |  | $ 548,200,000 | $ 344,600,000

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