DEBT - Schedule of Gain (Loss) on Debt Extinguishment (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		$ 0	$ 1,194	$ 0	$ 159,096
Loss on extinguishment of debt and write-off of deferred financing costs		0	(1,194)	0	(159,096)
CSC Holdings
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	$ (62,096)	0	1,194	0	159,096
Loss on extinguishment of debt and write-off of deferred financing costs	$ 62,096	$ 0	(1,194)	$ 0	(159,096)
10.125% Notes due January 15, 2023
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs			0		154,666
Loss on extinguishment of debt and write-off of deferred financing costs			0		(154,666)
CSC Holdings Term Loan Facility
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs			1,194		4,430
Loss on extinguishment of debt and write-off of deferred financing costs			$ (1,194)		$ (4,430)