DEBT - Schedule of Gain (Loss) on Debt Extinguishment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	$ 51,712	$ 250,489	$ 243,806
Loss on extinguishment of debt and write-off of deferred financing costs	(51,712)	(250,489)	(243,806)
CSC Holdings
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	51,712	250,489	228,130
Loss on extinguishment of debt and write-off of deferred financing costs	(51,712)	(250,489)	(228,130)
10.875% Notes due October 15, 2025
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		136,249
Loss on extinguishment of debt and write-off of deferred financing costs		(136,249)
8.0% Notes due April 15, 2020
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs			15,176
Loss on extinguishment of debt and write-off of deferred financing costs			(15,176)
Cablevision 5.125% Notes due December 15, 2021
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs			500
Loss on extinguishment of debt and write-off of deferred financing costs			(500)
CSC Holdings 5.125% Notes due December 15, 2021
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs			65,151
Loss on extinguishment of debt and write-off of deferred financing costs			(65,151)
10.125% Notes due January 15, 2023
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs			154,666
Loss on extinguishment of debt and write-off of deferred financing costs			(154,666)
CSC Holdings Term Loan Facility
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs			8,313
Loss on extinguishment of debt and write-off of deferred financing costs			$ (8,313)
CSC Holdings 5.375% Senior Guaranteed Notes Due 2023
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		26,721
Loss on extinguishment of debt and write-off of deferred financing costs		(26,721)
CSC Holdings 7.750% Notes due July 15, 2025
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		35,375
Loss on extinguishment of debt and write-off of deferred financing costs		(35,375)
6.625% Notes due October 15, 2025
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		52,144
Loss on extinguishment of debt and write-off of deferred financing costs		$ (52,144)
CSC Holdings 5.500% Notes due May 15, 2026 | Secured Debt [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	(51,712)
Loss on extinguishment of debt and write-off of deferred financing costs	$ 51,712