INTERIM FINANCIAL INFORMATION (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Selected Quarterly Financial Information [Abstract]
Revenues, net	$ 1,628,978	$ 1,612,601	$ 1,653,393	$ 1,614,771	$ 1,631,036	$ 1,626,187	$ 1,628,137	$ 1,575,586	$ 6,509,743	$ 6,460,946	$ 6,232,152
Operating expenses	(1,431,838)	(1,429,485)	(1,408,929)	(1,391,020)	(1,425,200)	(1,373,741)	(1,372,244)	(1,368,503)	(5,661,272)	(5,539,688)	(5,532,928)
Operating income	197,140	183,116	244,464	223,751	205,836	252,446	255,893	207,083	848,471	921,258	699,224
Income from continuing operations, net of income taxes	33,781	23,431	75,676	54,901	56,319	71,901	91,028	90,134	187,789	309,382	127,325
Loss from discontinued operations, net of income taxes	(1,633)	(406)	0	(10,502)	(175)	(79)	3,510	(434)	(12,541)	2,822	338,316
Net income	32,148	23,025	75,676	44,399	56,144	71,822	94,538	89,700	175,248	312,204	465,641
Net loss (income) attributable to noncontrolling interests	(30)	78	(81)	234	(169)	(331)	(328)	63	201	(765)	20
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	$ 32,118	$ 23,103	$ 75,595	$ 44,633	$ 55,975	$ 71,491	$ 94,210	$ 89,763	$ 175,449	$ 311,439	$ 465,661
Basic income (loss) per share attributable to Cablevision Systems Corporation stockholders [Abstract]
Income from continuing operations (in dollars per share)	$ 0.12	$ 0.09	$ 0.28	$ 0.21	$ 0.21	$ 0.27	$ 0.34	$ 0.34	$ 0.70	$ 1.17	$ 0.49
Loss from discontinued operations (in dollars per share)	(0.01)	0.00	0.00	(0.04)	0.00	0.00	0.01	0.00	(0.05)	0.01	1.30
Net income (in dollars per share)	0.12	0.09	0.28	0.17	0.21	0.27	0.36	0.34	0.65	1.18	1.79
Diluted income (loss) per share attributable to Cablevision Systems Corporation stockholders [Abstract]
Income from continuing operations (in dollars per share)	0.12	0.08	0.27	0.20	0.20	0.26	0.34	0.34	0.68	1.14	0.48
Loss from discontinued operations (in dollars per share)	(0.01)	0.00	0.00	(0.04)	0.00	0.00	0.01	0.00	(0.05)	0.01	1.27
Net income (in dollars per share)	$ 0.12	$ 0.08	$ 0.27	$ 0.16	$ 0.20	$ 0.26	$ 0.35	$ 0.33	$ 0.63	$ 1.15	$ 1.75
Amounts attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC sole member [Abstract]
Income from continuing operations, net of income taxes	$ 33,751	$ 23,509	$ 75,595	$ 55,135	$ 56,150	$ 71,570	$ 90,700	$ 90,197	$ 187,990	$ 308,617	$ 127,345
Loss from discontinued operations, net of income taxes	(1,633)	(406)	0	(10,502)	(175)	(79)	3,510	(434)	(12,541)	2,822	338,316
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	32,118	23,103	75,595	44,633	55,975	71,491	94,210	89,763	175,449	311,439	465,661
CSC Holdings, LLC
Selected Quarterly Financial Information [Abstract]
Revenues, net	1,628,978	1,612,601	1,653,393	1,614,771	1,631,036	1,626,187	1,628,137	1,575,586	6,509,743	6,460,946	6,232,152
Operating expenses	(1,431,838)	(1,429,485)	(1,408,929)	(1,391,020)	(1,425,200)	(1,373,741)	(1,372,244)	(1,368,503)	(5,661,272)	(5,539,688)	(5,532,928)
Operating income	197,140	183,116	244,464	223,751	205,836	252,446	255,893	207,083	848,471	921,258	699,224
Income from continuing operations, net of income taxes	75,208	62,244	113,804	92,936	91,476	109,399	129,321	129,755	344,192	459,951	289,344
Loss from discontinued operations, net of income taxes	(1,633)	(406)	0	(10,502)	(175)	(79)	3,510	(434)	(12,541)	2,822	330,711
Net income	73,575	61,838	113,804	82,434	91,301	109,320	132,831	129,321	331,651	462,773	620,055
Net loss (income) attributable to noncontrolling interests	(30)	78	(81)	234	(169)	(331)	(328)	63	201	(765)	20
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	73,545	61,916	113,723	82,668	91,132	108,989	132,503	129,384	331,852	462,008	620,075
Amounts attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC sole member [Abstract]
Income from continuing operations, net of income taxes	75,178	62,322	113,723	93,170	91,307	109,068	128,993	129,818	344,393	459,186	289,364
Loss from discontinued operations, net of income taxes	(1,633)	(406)	0	(10,502)	(175)	(79)	3,510	(434)	(12,541)	2,822	330,711
Net income attributable to Cablevision Systems Corporation stockholders/CSC Holdings, LLC's sole member	$ 73,545	$ 61,916	$ 113,723	$ 82,668	$ 91,132	$ 108,989	$ 132,503	$ 129,384	$ 331,852	$ 462,008	$ 620,075