INTERIM FINANCIAL INFORMATION (Unaudited) (Details) (USD $) In Thousands, except Per Share data, 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
Selected Quarterly Financial Information [Abstract]
Revenues, net	$ 1,631,036	$ 1,626,187	$ 1,628,137	$ 1,575,586	$ 1,583,468	$ 1,567,837	$ 1,569,619	$ 1,511,228		$ 6,460,946	$ 6,232,152	$ 6,131,675
Operating expenses	(1,425,200)	(1,373,741)	(1,372,244)	(1,368,503)	(1,414,821)	(1,342,410)	(1,371,856)	(1,403,841)		(5,539,688)	(5,532,928)	(5,362,627)
Operating income	205,836	252,446	255,893	207,083	168,647	225,427	197,763	107,387		921,258	699,224	769,048
Income (loss) from continuing operations, net of income taxes	56,319	71,901	91,028	90,134	46,488	59,748	28,222	(7,133)		309,382	127,325	74,325
Income from discontinued operations, net of income taxes	(175)	(79)	3,510	(434)	4,800	235,286	107,495	(9,265)		2,822	338,316	159,288
Net income	56,144	71,822	94,538	89,700	51,288	295,034	135,717	(16,398)		312,204	465,641	233,613
Net loss (income) attributable to noncontrolling interests	(169)	(331)	(328)	63	554	(433)	(358)	257		(765)	20	(90)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	55,975	71,491	94,210	89,763	51,842	294,601	135,359	(16,141)		311,439	465,661	233,523
Basic income (loss) per share attributable to Cablevision Systems Corporation stockholders [Abstract]
Income (loss) from continuing operations (in dollars per share)	$ 0.21	$ 0.27	$ 0.34	$ 0.34	$ 0.18	$ 0.23	$ 0.11	$ (0.03)	[1]	$ 1.17	$ 0.49	$ 0.28
Income (loss) from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.02	$ 0.90	$ 0.41	$ (0.04)	[1]	$ 0.01	$ 1.30	$ 0.61
Net income (in dollars per share)	$ 0.21	$ 0.27	$ 0.36	$ 0.34	$ 0.20	$ 1.13	$ 0.52	$ (0.06)	[1]	$ 1.18	$ 1.79	$ 0.89
Diluted income (loss) per share attributable to Cablevision Systems Corporation stockholders [Abstract]
Income (loss) from continuing operations (in dollars per share)	$ 0.20	$ 0.26	$ 0.34	$ 0.34	$ 0.18	$ 0.22	$ 0.11	$ (0.03)	[1]	$ 1.14	$ 0.48	$ 0.28
Income (loss) from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.01	$ 0.00	$ 0.02	$ 0.88	$ 0.41	$ (0.04)	[1]	$ 0.01	$ 1.27	$ 0.60
Net income (in dollars per share)	$ 0.20	$ 0.26	$ 0.35	$ 0.33	$ 0.19	$ 1.10	$ 0.51	$ (0.06)	[1]	$ 1.15	$ 1.75	$ 0.87
Amounts attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC sole member [Abstract]
Income (loss) from continuing operations, net of income taxes	56,150	71,570	90,700	90,197	47,042	59,315	27,864	(6,876)		308,617	127,345	74,235
Income from discontinued operations, net of income taxes	(175)	(79)	3,510	(434)	4,800	235,286	107,495	(9,265)		2,822	338,316	159,288
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	55,975	71,491	94,210	89,763	51,842	294,601	135,359	(16,141)		311,439	465,661	233,523
CSC Holdings, LLC
Selected Quarterly Financial Information [Abstract]
Revenues, net	1,631,036	1,626,187	1,628,137	1,575,586	1,583,468	1,567,837	1,569,619	1,511,228		6,460,946	6,232,152	6,131,675
Operating expenses	(1,425,200)	(1,373,741)	(1,372,244)	(1,368,503)	(1,414,821)	(1,342,410)	(1,371,856)	(1,403,841)		(5,539,688)	(5,532,928)	(5,362,627)
Operating income	205,836	252,446	255,893	207,083	168,647	225,427	197,763	107,387		921,258	699,224	769,048
Income (loss) from continuing operations, net of income taxes	91,476	109,399	129,321	129,755	87,289	98,051	70,049	33,955		459,951	289,344	227,063
Income from discontinued operations, net of income taxes	(175)	(79)	3,510	(434)	(2,198)	235,682	106,492	(9,265)		2,822	330,711	159,288
Net income	91,301	109,320	132,831	129,321	85,091	333,733	176,541	24,690		462,773	620,055	386,351
Net loss (income) attributable to noncontrolling interests	(169)	(331)	(328)	63	554	(433)	(358)	257		(765)	20	(90)
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	91,132	108,989	132,503	129,384	85,645	333,300	176,183	24,947		462,008	620,075	386,261
Amounts attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC sole member [Abstract]
Income (loss) from continuing operations, net of income taxes	91,307	109,068	128,993	129,818	87,843	97,618	69,691	34,212		459,186	289,364	226,973
Income from discontinued operations, net of income taxes	(175)	(79)	3,510	(434)	(2,198)	235,682	106,492	(9,265)		2,822	330,711	159,288
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	$ 91,132	$ 108,989	$ 132,503	$ 129,384	$ 85,645	$ 333,300	$ 176,183	$ 24,947		$ 462,008	$ 620,075	$ 386,261

[1] Since Cablevision generated a loss from continuing operations for the three months ended March 31, 2013, the outstanding common stock equivalents were excluded from the computation of net loss per share for the respective period as the impact would be anti-dilutive.