DEBT - Schedule of Gain (Loss) on Debt Extinguishment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	$ 1,194	$ 36,911	$ 159,096	$ 41,616
CSC Holdings | Senior Notes | Cablevision 7.75% Notes due April 15, 2018 [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		1		4,706
CSC Holdings | Senior Notes | 7.75% Notes due April 15, 2018
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	0		154,666
Revolving Credit Facility | CSC Holdings
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	$ 1,194		$ 4,430	$ 36,910
5.375% Senior Guaranteed Notes Due February 1, 2028 [Member] | CSC Holdings
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs		$ 36,910