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LONG-TERM DEBT - Size and Availability (Details) - Line of Credit - Asset-based Revolving Credit Facility Due 2023 - USD ($) | Jun. 14, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | May 01, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  | $ 450,000,000.0 |  |
Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity |  |  | $ 450,000,000 |
Revolving credit facility | CCOH |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 450,000,000.0 |  |  | $ 450,000,000.0
Line of credit facility, borrowing base terms, percentage of eligible accounts receivable | 90.00% |  |  |
Line of credit facility, borrowing base terms, percentage of qualified cash | 100.00% |  |  |
Maximum aggregate increase in credit facility | $ 150,000,000.0 |  |  |

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- Definition Credit Facility, Borrowing Base Terms, Percentage Of Eligible Accounts Receivable + References No definition available. + Details
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Namespace Prefix: | cik0001400891_
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Balance Type: | na
Period Type: | duration

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- Definition Credit Facility, Borrowing Base Terms, Percentage Of Qualified Cash + References No definition available. + Details
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- Definition Credit Facility, Maximum Aggregate Increase In Credit Facility + References No definition available. + Details
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Namespace Prefix: | cik0001400891_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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- Details
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- Details
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- Details
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