FAIR VALUE MEASUREMENT, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Carrying Amount (c)
Debt instruments:
Total debt instruments	[1]	$ 9,507,344	$ 9,521,333
Estimated Fair Value
Debt instruments:
Total debt instruments		9,452,730	9,473,141
CSC Holdings, LLC | Carrying Amount (c)
Debt instruments:
Total debt instruments	[1]	6,736,248	6,752,574
CSC Holdings, LLC | Carrying Amount (c) | Level II
CSC Holdings notes receivable:
Cablevision senior notes held by Newsday Holdings LLC	[1],[2]	611,455	611,455
Debt instruments:
Credit facility debt	[1],[3]	2,500,453	2,514,454
Collateralized indebtedness	[1]	1,191,324	1,191,324
Senior notes and debentures	[1]	3,034,301	3,032,252
Notes payable	[1]	10,170	14,544
CSC Holdings, LLC | Estimated Fair Value
Debt instruments:
Total debt instruments		6,692,562	6,712,973
CSC Holdings, LLC | Estimated Fair Value | Level II
CSC Holdings notes receivable:
Cablevision senior notes held by Newsday Holdings LLC	[2]	616,020	616,020
Debt instruments:
Credit facility debt	[3]	2,510,701	2,525,654
Collateralized indebtedness		1,175,291	1,176,396
Senior notes and debentures		2,996,440	2,996,440
Notes payable		10,130	14,483
Cablevision Systems Corporation | Carrying Amount (c) | Level II
Debt instruments:
Senior notes and debentures	[1]	2,771,096	2,768,759
Cablevision Systems Corporation | Estimated Fair Value | Level II
Debt instruments:
Senior notes and debentures		$ 2,760,168	$ 2,760,168

[1] Amounts are net of unamortized deferred financing costs and discounts

[2] These notes are eliminated at the consolidated Cablevision level.

[3] The principal amount of the Company's credit facility debt, which bears interest at variable rates, approximates its fair value.