BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Basis of Presentation [Abstract]
Debt instrument, unamortized debt discounts	$ 16,626
Deferred financing costs netted against debt	63,248
Deferred financing costs, net of accumulated amortization	6,808	$ 7,588
Cablevision Systems Corporation
Basis of Presentation [Abstract]
Senior notes, principal outstanding	2,771,096
Senior notes due to Newsday	611,455
CSC Holdings, LLC
Basis of Presentation [Abstract]
Debt instrument, unamortized debt discounts	13,626
Deferred financing costs netted against debt	38,320
Deferred financing costs, net of accumulated amortization	$ 6,808	7,588
Long-term Debt | Accounting Standards Update 2015-03
Basis of Presentation [Abstract]
Deferred finance costs, net		67,119
Long-term Debt | Accounting Standards Update 2015-03 | CSC Holdings, LLC
Basis of Presentation [Abstract]
Deferred finance costs, net		40,328
Deferred Finance Costs, Noncurrent, Net | Accounting Standards Update 2015-03
Basis of Presentation [Abstract]
Deferred finance costs, net		(67,119)
Deferred Finance Costs, Noncurrent, Net | Accounting Standards Update 2015-03 | CSC Holdings, LLC
Basis of Presentation [Abstract]
Deferred finance costs, net		$ (40,328)