DEBT, Senior Notes and Debentures (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	May. 31, 2014	Jan. 31, 2014
Senior Notes and Debentures [Abstract]
Carrying amount		$ 5,860,642,000		$ 5,855,867,000
CSC Holdings, LLC
Senior Notes and Debentures [Abstract]
Carrying amount		$ 3,065,092,000		3,062,126,000
CSC Holdings, LLC | Debentures | 7.875% Debentures due February 2018
Senior Notes and Debentures [Abstract]
Issuer		CSC Holdings (a)(c)
Date issued	[1],[2]	Feb. 06, 1998
Maturity date	[1],[2]	Feb. 15, 2018
Interest rate (percent)	[1],[2]	7.875%
Issue amount	[1],[2]	$ 300,000,000
Carrying amount	[1],[2]	$ 299,635,000		299,464,000
CSC Holdings, LLC | Debentures | 7.625% Debentures due July 2018
Senior Notes and Debentures [Abstract]
Issuer		CSC Holdings (a)(c)
Date issued	[1],[2]	Jul. 21, 1998
Maturity date	[1],[2]	Jul. 15, 2018
Interest rate (percent)	[1],[2]	7.625%
Issue amount	[1],[2]	$ 500,000,000
Carrying amount	[1],[2]	$ 499,937,000		499,912,000
CSC Holdings, LLC | Senior Notes | Senior 8.625% Notes due February 2019
Senior Notes and Debentures [Abstract]
Issuer		CSC Holdings (b)(c)
Date issued	[1],[3]	Feb. 12, 2009
Maturity date	[1],[3]	Feb. 15, 2019
Interest rate (percent)	[1],[3]	8.625%
Issue amount	[1],[3]	$ 526,000,000
Carrying amount	[1],[3]	$ 515,520,000		512,750,000
CSC Holdings, LLC | Senior Notes | Senior 6.75% Notes due November 2021
Senior Notes and Debentures [Abstract]
Issuer		CSC Holdings (b)
Date issued	[3]	Nov. 15, 2011
Maturity date	[3]	Nov. 15, 2021
Interest rate (percent)	[3]	6.75%
Issue amount	[3]	$ 1,000,000,000
Carrying amount	[3]	$ 1,000,000,000		1,000,000,000
CSC Holdings, LLC | Senior Notes | Senior 5.25% Notes due June 1, 2024
Senior Notes and Debentures [Abstract]
Issuer		CSC Holdings (b)
Date issued	[3]	May 23, 2014
Maturity date	[3]	Jun. 01, 2024
Interest rate (percent)		5.25%	[3]		5.25%
Issue amount		$ 750,000,000	[3]		$ 750,000,000
Carrying amount	[3]	750,000,000		750,000,000
Cablevision Systems Corporation
Senior Notes and Debentures [Abstract]
Senior notes due to Newsday		$ 611,455,000
Cablevision Systems Corporation | Senior Notes | Senior 8.625% Notes due September 2017
Senior Notes and Debentures [Abstract]
Issuer		Cablevision (b)(c)
Date issued	[1],[3]	Sep. 23, 2009
Maturity date	[1],[3]	Sep. 15, 2017
Interest rate (percent)	[1],[3]	8.625%
Issue amount	[1],[3]	$ 900,000,000
Carrying amount	[1],[3]	$ 896,526,000		894,717,000
Cablevision Systems Corporation | Senior Notes | Senior 7.75% Notes due April 2018
Senior Notes and Debentures [Abstract]
Issuer		Cablevision (b)
Date issued	[3]	Apr. 15, 2010
Maturity date	[3]	Apr. 15, 2018
Interest rate (percent)	[3]	7.75%
Issue amount	[3]	$ 750,000,000
Carrying amount	[3]	$ 750,000,000		750,000,000
Senior notes due to Newsday				345,238,000
Cablevision Systems Corporation | Senior Notes | Senior 8% Notes due April 2020
Senior Notes and Debentures [Abstract]
Issuer		Cablevision (b)
Date issued	[3]	Apr. 15, 2010
Maturity date	[3]	Apr. 15, 2020
Interest rate (percent)	[3]	8.00%
Issue amount	[3]	$ 500,000,000
Carrying amount	[3]	500,000,000		500,000,000
Senior notes due to Newsday		$ 266,217,000		266,217,000
Cablevision Systems Corporation | Senior Notes | Senior 5.875% Notes due September 2022
Senior Notes and Debentures [Abstract]
Issuer		Cablevision (b)
Date issued	[3]	Sep. 27, 2012
Maturity date	[3]	Sep. 15, 2022
Interest rate (percent)		5.875%	[3]			5.875%
Issue amount	[3]	$ 649,024,000
Carrying amount	[3]	$ 649,024,000		$ 649,024,000

[1] The carrying amount of the senior notes is net of the unamortized original issue discount.

[2] The debentures are not redeemable by the Company prior to maturity.

[3] The Company may redeem some or all of the notes at any time at a specified "make-whole" price plus accrued and unpaid interest to the redemption date.