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BASIS OF PRESENTATION - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
Jul. 16, 2020
Mar. 26, 2020
Mar. 13, 2020
Jul. 31, 2020
Mar. 31, 2020
May 01, 2019
Sep. 30, 2020
Dec. 31, 2018
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
May 02, 2019
Segment Reporting Information [Line Items]                            
Cash and cash equivalents             $ 713,728,000       $ 400,300,000      
Goodwill impairment         $ 1,200,000,000   $ 1,224,374,000              
Accounting Standards Update [Extensible List]             us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201602Member            
Cumulative effect adjustment           $ 2,779,115,000 $ 1,039,648,000 $ (11,560,342,000) $ 1,065,642,000   2,945,441,000 $ 2,846,917,000 $ 2,820,048,000 $ 2,779,115,000
Credit loss reserve for available-for-sale debt securities             5,600,000              
Cumulative Effect, Period of Adoption, Adjustment                            
Segment Reporting Information [Line Items]                            
Cumulative effect adjustment               128,908,000            
Asset-based Revolving Credit Facility due 2023                            
Segment Reporting Information [Line Items]                            
Repayments of facilities       $ 235,000,000.0                    
Subsidiary | Asset-based Revolving Credit Facility due 2023                            
Segment Reporting Information [Line Items]                            
Repayments of facilities $ 235,000,000.0                          
Subsidiary | Term Loan                            
Segment Reporting Information [Line Items]                            
Debt instrument, face amount       2,500,000,000                    
Line of Credit | Asset-based Revolving Credit Facility due 2023                            
Segment Reporting Information [Line Items]                            
Debt instrument, face amount             450,000,000.0              
Maximum borrowings provided under credit facility             365,600,000              
Outstanding borrowings under facility             0              
Letters of credit outstanding             41,200,000              
Line of credit, excess availability             324,400,000              
Line of credit, amount available to be drawn             165,000,000              
Line of Credit | Subsidiary | Asset-based Revolving Credit Facility due 2023                            
Segment Reporting Information [Line Items]                            
Draws on credit facilities   $ 350,000,000.0 $ 350,000,000.0                      
Secured Debt | Subsidiary                            
Segment Reporting Information [Line Items]                            
Proceeds from issuance of term loan       $ 450,000,000.0                    
FCC Licenses                            
Segment Reporting Information [Line Items]                            
Impairment of FCC licenses         $ 502,700,000 91,400,000                
Retained Earnings (Accumulated Deficit)                            
Segment Reporting Information [Line Items]                            
Cumulative effect adjustment           $ 0 $ (1,807,086,000) (13,345,346,000) $ (1,774,974,000)   $ 112,548,000 $ 51,167,000 $ 38,793,000 $ 0
Retained Earnings (Accumulated Deficit) | Cumulative Effect, Period of Adoption, Adjustment                            
Segment Reporting Information [Line Items]                            
Cumulative effect adjustment               $ 128,908,000   $ 1,500,000