FAIR VALUE MEASUREMENT, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Carrying Amount
Debt instruments:
Total debt instruments		$ 9,588,452	$ 9,646,610
Carrying Amount | Level II
Debt instruments:
Senior notes and debentures		2,795,550	2,793,741
Estimated Fair Value
Debt instruments:
Total debt instruments		9,473,141	10,184,722
Estimated Fair Value | Level II
Debt instruments:
Senior notes and debentures		2,760,168	3,048,387
CSC Holdings, LLC | Carrying Amount
Debt instruments:
Total debt instruments		6,792,902	6,852,869
CSC Holdings, LLC | Carrying Amount | Level II
CSC Holdings notes receivable:
Cablevision senior notes held by Newsday Holdings LLC	[1]	611,455	611,455
Debt instruments:
Credit facility debt	[2]	2,521,942	2,780,649
Collateralized indebtedness		1,191,324	986,183
Senior notes and debentures		3,065,092	3,062,126
Notes payable		14,544	23,911
CSC Holdings, LLC | Estimated Fair Value
Debt instruments:
Total debt instruments		6,712,973	7,136,335
CSC Holdings, LLC | Estimated Fair Value | Level II
CSC Holdings notes receivable:
Cablevision senior notes held by Newsday Holdings LLC	[1]	616,020	680,587
Debt instruments:
Credit facility debt	[2]	2,525,654	2,785,975
Collateralized indebtedness		1,176,396	957,803
Senior notes and debentures		2,996,440	3,368,875
Notes payable		$ 14,483	$ 23,682

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

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