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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 2,313,824,000 |  |  |  | $ 2,313,824,000 | $ 2,313,824,000 |  | $ 2,145,935,000 | $ 3,325,622,000
Annual intangible assets impairment test, forecast period |  |  |  |  |  |  | 10 years |  |  |
Impairment of intangible assets, indefinite-lived |  |  |  |  |  |  | $ 0 |  |  |
Impairment of definite-lived intangibles |  |  |  |  | $ 0 |  |  |  |  |
Total amortization expense related to definite-lived intangible assets |  | $ 64,300,000 |  | $ 64,500,000 |  |  | $ 218,000,000 | $ 193,000,000 |  |
Goodwill impairment |  |  | $ 0 |  | 1,200,000,000 | $ 0 |  |  | $ 1,224,374,000 |
FCC Licenses |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets, indefinite-lived |  |  |  |  | $ 502,700,000 |  |  |  |  |
Triton Digital |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration transferred for acquisition | $ 228,500,000 |  |  |  |  |  |  |  |  |
Assets acquired | 69,400,000 |  | 69,400,000 |  |  |  |  |  |  |
Intangible assets acquired | 191,500,000 |  | 191,500,000 |  |  |  |  |  |  |
Goodwill | 168,200,000 |  | 168,200,000 |  |  |  |  |  |  |
Tax-deductible goodwill | 6,900,000 |  | 6,900,000 |  |  |  |  |  |  |
Liabilities assumed | $ 32,400,000 |  | $ 32,400,000 |  |  |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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