SEGMENT INFORMATION, Reconciliation of Reportable Segments to Consolidated Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	$ 244,464	$ 255,893	$ 468,215	$ 462,976
Items excluded from operating income:
Gain on investments, net	78,818	78,612	45,747	36,837
Gain (loss) on equity derivative contracts, net	(22,693)	(32,613)	23,473	6,036
Loss on extinguishment of debt and write-off of deferred financing costs	(1,735)	(7,687)	(1,735)	(8,298)
Miscellaneous, net	1,307	1,806	2,314	2,537
Income from continuing operations before income taxes	154,285	152,876	247,126	216,071
CSC Holdings, LLC
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	244,464	255,893	468,215	462,976
Items excluded from operating income:
Interest expense	(90,339)	(87,580)	(179,891)	(172,800)
Gain on investments, net	78,818	78,612	45,747	36,837
Gain (loss) on equity derivative contracts, net	(22,693)	(32,613)	23,473	6,036
Loss on extinguishment of debt and write-off of deferred financing costs	(1,735)	(7,687)	(1,735)	(7,687)
Miscellaneous, net	1,307	1,806	2,314	2,537
Income from continuing operations before income taxes	221,997	220,548	382,475	352,101
Significant Reconciling Items | CSC Holdings, LLC
Operating Income (Loss) from Continuing Operations Before Income Taxes [Abstract]
Operating income for reportable segments	244,464	255,893	468,215	462,976
Items excluded from operating income:
Interest expense	(90,339)	(87,580)	(179,891)	(172,800)
Interest income	161	103	325	175
Intercompany interest income	12,014	12,014	24,027	24,027
Gain on investments, net	78,818	78,612	45,747	36,837
Gain (loss) on equity derivative contracts, net	(22,693)	(32,613)	23,473	6,036
Loss on extinguishment of debt and write-off of deferred financing costs	(1,735)	(7,687)	(1,735)	(7,687)
Miscellaneous, net	1,307	1,806	2,314	2,537
Income from continuing operations before income taxes	221,997	220,548	382,475	352,101
Significant Reconciling Items | Cablevision Systems Corporation
Items excluded from operating income:
Interest expense	(55,705)	(55,662)	(111,334)	(111,398)
Intercompany interest expense	(12,014)	(12,014)	(24,027)	(24,027)
Interest income	7	4	12	6
Loss on extinguishment of debt and write-off of deferred financing costs	$ 0	$ 0	$ 0	$ (611)