SEGMENT INFORMATION, Reconciliation of Reportable Segments to Consolidated Balances (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	$ 197,140	$ 183,116	$ 244,464	$ 223,751	$ 205,836	$ 252,446	$ 255,893	$ 207,083	$ 848,471	$ 921,258	$ 699,224
Items excluded from operating income:
Interest expense									(585,764)	(576,000)	(601,102)
Gain (loss) on investments, net									(30,208)	129,659	313,167
Gain (loss) on equity derivative contracts, net									104,927	(45,055)	(198,688)
Loss on extinguishment of debt and write-off of deferred financing costs									(1,735)	(10,120)	(22,542)
Miscellaneous, net									6,045	4,988	2,436
Income from continuing operations before income taxes									342,661	425,150	192,960
CSC Holdings, LLC
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	$ 197,140	$ 183,116	$ 244,464	$ 223,751	$ 205,836	$ 252,446	$ 255,893	$ 207,083	848,471	921,258	699,224
Items excluded from operating income:
Interest expense									(362,903)	(353,288)	(374,430)
Gain (loss) on investments, net									(30,208)	129,659	313,167
Gain (loss) on equity derivative contracts, net									104,927	(45,055)	(198,688)
Loss on extinguishment of debt and write-off of deferred financing costs									(1,735)	(9,618)	(23,144)
Miscellaneous, net									6,045	4,988	2,436
Income from continuing operations before income taxes									613,548	696,401	477,423
CSC Holdings, LLC | Significant Reconciling Items
Items excluded from operating income:
Interest expense									(362,903)	(353,288)	(374,430)
Interest income									897	403	423
CSC Holdings intercompany interest income									48,054	48,054	58,435
Gain (loss) on investments, net									(30,208)	129,659	313,167
Gain (loss) on equity derivative contracts, net									104,927	(45,055)	(198,688)
Loss on extinguishment of debt and write-off of deferred financing costs									(1,735)	(9,618)	(23,144)
Miscellaneous, net									6,045	4,988	2,436
Cablevision Systems Corporation | Significant Reconciling Items
Items excluded from operating income:
Interest expense									(222,861)	(222,712)	(226,672)
Intercompany interest expense									(48,054)	(48,054)	(58,435)
Interest income									28	17	42
Loss on extinguishment of debt and write-off of deferred financing costs									$ 0	$ (502)	$ 602