SEGMENT INFORMATION, Reconciliation of Reportable Segments to Consolidated Balances (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	$ 252,446	$ 225,427	$ 715,422	$ 530,577
Items Excluded from Operating Income [Abstract]
Gain on investments, net	2,151	70,222	38,988	166,891
Gain (loss) on equity derivative contracts, net	13,679	(40,750)	19,715	(93,260)
Loss on extinguishment of debt and write-off of deferred financing costs	(1,931)	(16,509)	(10,229)	(23,146)
Miscellaneous, net	811	805	3,348	1,673
Income from continuing operations before income taxes	120,714	93,920	336,785	124,873
Reportable Segments [Member]
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	252,446	225,427	715,422	530,577
CSC Holdings, LLC [Member]
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	252,446	225,427	715,422	530,577
Items Excluded from Operating Income [Abstract]
Interest expense	(90,862)	(88,516)	(263,662)	(287,587)
Gain on investments, net	2,151	70,222	38,988	166,891
Gain (loss) on equity derivative contracts, net	13,679	(40,750)	19,715	(93,260)
Loss on extinguishment of debt and write-off of deferred financing costs	(1,931)	(16,507)	(9,618)	(23,144)
Miscellaneous, net	811	805	3,348	1,673
Income from continuing operations before income taxes	188,406	165,592	540,507	339,773
CSC Holdings, LLC [Member] | Significant Reconciling Items [Member]
Items Excluded from Operating Income [Abstract]
Interest expense	(90,862)	(88,516)	(263,662)	(287,587)
Interest income	99	141	274	314
Intercompany interest income	12,013	14,770	36,040	44,309
Gain on investments, net	2,151	70,222	38,988	166,891
Gain (loss) on equity derivative contracts, net	13,679	(40,750)	19,715	(93,260)
Loss on extinguishment of debt and write-off of deferred financing costs	(1,931)	(16,507)	(9,618)	(23,144)
Miscellaneous, net	811	805	3,348	1,673
Cablevision Systems Corporation [Member] | Significant Reconciling Items [Member]
Items Excluded from Operating Income [Abstract]
Interest expense	(55,685)	(56,908)	(167,083)	(170,631)
Intercompany interest expense	(12,013)	(14,770)	(36,040)	(44,309)
Interest income	6	8	12	42
Loss on extinguishment of debt and write-off of deferred financing costs	$ 0	$ (2)	$ (611)	$ (2)