SEGMENT INFORMATION, Reconciliation of Reportable Segments to Consolidated Balances (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	$ 223,751	$ 207,083
Items excluded from operating income:
Loss on investments, net	(33,071)	(41,775)
Gain on equity derivative contracts, net	46,166	38,649
Write-off of deferred financing costs, net of gain on extinguishment of debt	0	(611)
Miscellaneous, net	1,007	731
Income from continuing operations before income taxes	92,841	63,195
Reportable Segments
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	223,751	207,083
CSC Holdings, LLC
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	223,751	207,083
Items excluded from operating income:
Interest expense	(89,552)	(85,220)
Loss on investments, net	(33,071)	(41,775)
Gain on equity derivative contracts, net	46,166	38,649
Miscellaneous, net	1,007	731
Income from continuing operations before income taxes	160,478	131,553
CSC Holdings, LLC | Reportable Segments
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	223,751	207,083
CSC Holdings, LLC | Significant Reconciling Items
Items excluded from operating income:
Interest expense	(89,552)	(85,220)
Interest income	164	72
Intercompany interest income	12,013	12,013
Loss on investments, net	(33,071)	(41,775)
Gain on equity derivative contracts, net	46,166	38,649
Miscellaneous, net	1,007	731
Cablevision Systems Corporation | Significant Reconciling Items
Items excluded from operating income:
Interest expense	(55,629)	(55,736)
Intercompany interest expense	(12,013)	(12,013)
Interest income	5	2
Write-off of deferred financing costs, net of gain on extinguishment of debt	$ 0	$ (611)