SEGMENT INFORMATION, Reconciliation of Reportable Segments to Consolidated Balances (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	$ 205,836	$ 252,446	$ 255,893	$ 207,083	$ 168,647	$ 225,427	$ 197,763	$ 107,387	$ 921,258	$ 699,224	$ 769,048
Items excluded from operating income:
Interest expense									(576,000)	(601,102)	(661,052)
Gain on sale of affiliate interests									0	0	716
Gain on investments, net									129,659	313,167	294,235
Loss on equity derivative contracts, net									(45,055)	(198,688)	(211,335)
Loss on interest rate swap contracts, net									0	0	(1,828)
Loss on extinguishment of debt and write-off of deferred financing costs									(10,120)	(22,542)	(66,213)
Miscellaneous, net									4,988	2,436	1,770
Income from continuing operations before income taxes									425,150	192,960	126,319
CSC Holdings, LLC
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	205,836	252,446	255,893	207,083	168,647	225,427	197,763	107,387	921,258	699,224	769,048
Items excluded from operating income:
Interest expense									(353,288)	(374,430)	(466,776)
Gain on sale of affiliate interests									0	0	716
Gain on investments, net									129,659	313,167	294,235
Loss on equity derivative contracts, net									(45,055)	(198,688)	(211,335)
Loss on interest rate swap contracts, net									0	0	(1,828)
Loss on extinguishment of debt and write-off of deferred financing costs									(9,618)	(23,144)	(66,213)
Miscellaneous, net									4,988	2,436	1,770
Income from continuing operations before income taxes									696,401	477,423	379,610
CSC Holdings, LLC | Significant Reconciling Items
Items excluded from operating income:
Interest expense									(353,288)	(374,430)	(466,776)
Interest income									403	423	914
Intercompany interest income									48,054	58,435	59,079
Gain on sale of affiliate interests									0	0	716
Gain on investments, net									129,659	313,167	294,235
Loss on equity derivative contracts, net									(45,055)	(198,688)	(211,335)
Loss on interest rate swap contracts, net									0	0	(1,828)
Loss on extinguishment of debt and write-off of deferred financing costs									(9,618)	(23,144)	(66,213)
Miscellaneous, net									4,988	2,436	1,770
Cablevision Systems Corporation | Significant Reconciling Items
Items excluded from operating income:
Interest expense									(222,712)	(226,672)	(194,276)
Intercompany interest expense									(48,054)	(58,435)	(59,079)
Interest income									17	42	64
Loss on extinguishment of debt and write-off of deferred financing costs									$ (502)	$ 602	$ 0