DISCONTINUED OPERATIONS, Operating Results of Discontinued Operations (Details) (USD $)	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
Operating Results of Discontinued Operations [Abstract]
Revenues, net									$ 0		$ 289,630,000		$ 573,786,000
Income (loss) before income taxes									5,028,000		571,123,000		269,869,000
Income tax benefit (expense)									(2,206,000)		(232,807,000)	[1]	(110,581,000)
Income (loss) from discontinued operations, net of income taxes	(175,000)	(79,000)	3,510,000	(434,000)	4,800,000	235,286,000	107,495,000	(9,265,000)	2,822,000		338,316,000		159,288,000
Income tax benefit recognized at Cablevision, not applicable to CSC Holdings											(7,605,000)
Impairment loss relating to goodwill									0		0		0
Goodwill, net of accumulated impairment losses	264,690,000				264,690,000				264,690,000		264,690,000
Litigation Settlement
Operating Results of Discontinued Operations [Abstract]
Revenues, net											0	[2]	0	[3]
Income (loss) before income taxes											173,690,000	[4]	339,004,000	[3]
Income tax benefit (expense)											(70,054,000)	[1],[4]	(138,754,000)	[3]
Income (loss) from discontinued operations, net of income taxes											103,636,000	[4]	200,250,000	[3]
Income tax benefit recognized at Cablevision, not applicable to CSC Holdings											(1,003,000)	[4]
Bresnan Cable
Operating Results of Discontinued Operations [Abstract]
Revenues, net									0	[5]	262,323,000	[4]	508,710,000
Income (loss) before income taxes									5,848,000	[5]	439,870,000	[4]	(49,452,000)
Income tax benefit (expense)									(2,542,000)	[5]	(180,178,000)	[1],[4]	20,157,000
Income (loss) from discontinued operations, net of income taxes											259,692,000	[4]	(29,295,000)
Income tax benefit recognized at Cablevision, not applicable to CSC Holdings											(6,602,000)	[4]
Pretax gain (loss) recognized in connection with sale											408,000,000
Clearview Cinemas
Operating Results of Discontinued Operations [Abstract]
Revenues, net									0		27,307,000	[6],[7]	65,076,000
Income (loss) before income taxes									(820,000)		(42,437,000)	[6],[7]	(19,683,000)
Income tax benefit (expense)									336,000		17,425,000	[1],[6],[7]	8,016,000
Income (loss) from discontinued operations, net of income taxes											(25,012,000)	[6],[7]	(11,667,000)
Income tax benefit recognized at Cablevision, not applicable to CSC Holdings											0	[6],[7]
Pretax gain (loss) recognized in connection with sale											(19,300,000)
Impairment loss relating to goodwill								10,347,000
Goodwill, net of accumulated impairment losses					0						0
CSC Holdings, LLC
Operating Results of Discontinued Operations [Abstract]
Income (loss) from discontinued operations, net of income taxes	(175,000)	(79,000)	3,510,000	(434,000)	(2,198,000)	235,682,000	106,492,000	(9,265,000)	2,822,000		330,711,000		159,288,000
Goodwill, net of accumulated impairment losses	264,690,000				264,690,000				264,690,000		264,690,000
CSC Holdings, LLC | Litigation Settlement
Operating Results of Discontinued Operations [Abstract]
Income (loss) from discontinued operations, net of income taxes											102,633,000	[4]
CSC Holdings, LLC | Bresnan Cable
Operating Results of Discontinued Operations [Abstract]
Income (loss) from discontinued operations, net of income taxes									3,306,000	[5]	253,090,000	[4]
CSC Holdings, LLC | Clearview Cinemas
Operating Results of Discontinued Operations [Abstract]
Income (loss) from discontinued operations, net of income taxes									$ (484,000)		$ (25,012,000)	[6],[7]

[1] Includes tax benefit of $7,605 resulting from a decrease in the valuation allowance for certain state net operating loss carry forwards.

[2] Represents primarily the proceeds from the final allocation of the DISH Network, LLC litigation settlement. See discussion below for additional information.

[3] Represents primarily the gain relating to the settlement of litigation with DISH Network, LLC. See discussion below for additional information.

[4] Includes the pretax gain recognized in connection with the Bresnan Sale of approximately $408,000.

[5] Represents primarily a gain recognized upon the settlement of a contingency related to Montana property taxes.

[6] Includes the pretax loss recognized in connection with the Clearview Sale of approximately $19,300.

[7] As a result of the Company's annual impairment test in the first quarter of 2013, the Company recorded an impairment charge of $10,347, relating to goodwill of the Company's Clearview business which reduced the carrying value to zero. The Company determined the fair value of the Clearview business, which was a single reporting unit, assuming highest and best use, based on either an income or market approach on a theater by theater basis.