SEGMENT INFORMATION, Reconciliation of Reportable Segments to Consolidated Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	$ 251,255	$ 223,751
Items excluded from operating income:
Gain (loss) on investments, net	100,365	(33,071)
Gain (loss) on equity derivative contracts, net	(48,012)	46,166
Miscellaneous, net	1,971	1,007
Income from continuing operations before income taxes	157,097	92,841
CSC Holdings, LLC
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	251,255	223,751
Items excluded from operating income:
Interest expense	(93,560)	(89,552)
Gain (loss) on investments, net	100,365	(33,071)
Gain (loss) on equity derivative contracts, net	(48,012)	46,166
Miscellaneous, net	1,971	1,007
Income from continuing operations before income taxes	224,906	160,478
Significant Reconciling Items | CSC Holdings, LLC
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	251,255	223,751
Items excluded from operating income:
Interest expense	(93,560)	(89,552)
Interest income	874	164
CSC Holdings intercompany interest income	12,013	12,013
Gain (loss) on investments, net	100,365	(33,071)
Gain (loss) on equity derivative contracts, net	(48,012)	46,166
Miscellaneous, net	1,971	1,007
Income from continuing operations before income taxes	224,906	160,478
Significant Reconciling Items | Cablevision Systems Corporation
Items excluded from operating income:
Interest expense	(55,807)	(55,629)
Intercompany interest expense	(12,013)	(12,013)
Interest income	$ 11	$ 5