FAIR VALUE MEASUREMENT, Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Carrying Amount [Member]
Debt instruments [Abstract]
Total debt instruments	$ 9,672,811		$ 9,727,944
Estimated Fair Value [Member]
Debt instruments [Abstract]
Total debt instruments	10,068,116		10,301,457
CSC Holdings, LLC [Member] | Carrying Amount [Member]
Debt instruments [Abstract]
Total debt instruments	6,870,302		6,898,832
CSC Holdings, LLC [Member] | Carrying Amount [Member] | Level II [Member]
CSC Holdings notes receivable [Abstract]
Cablevision senior notes held by Newsday Holdings LLC	611,455	[1]	611,455	[1]
Debt instruments [Abstract]
Credit facility debt	2,795,869	[2]	3,766,145	[2]
Collateralized indebtedness	986,183		817,950
Senior notes and debentures	3,061,424		2,309,403
Notes payable	26,826		5,334
CSC Holdings, LLC [Member] | Estimated Fair Value [Member]
Debt instruments [Abstract]
Total debt instruments	7,068,264		7,200,084
CSC Holdings, LLC [Member] | Estimated Fair Value [Member] | Level II [Member]
CSC Holdings notes receivable [Abstract]
Cablevision senior notes held by Newsday Holdings LLC	667,008	[1]	682,887	[1]
Debt instruments [Abstract]
Credit facility debt	2,801,437	[2]	3,776,760	[2]
Collateralized indebtedness	960,858		809,105
Senior notes and debentures	3,279,405		2,608,885
Notes payable	26,564		5,334
Cablevision Systems Corporation [Member] | Carrying Amount [Member] | Level II [Member]
Debt instruments [Abstract]
Senior notes and debentures	2,802,509		2,829,112
Cablevision Systems Corporation [Member] | Estimated Fair Value [Member] | Level II [Member]
Debt instruments [Abstract]
Senior notes and debentures	$ 2,999,852		$ 3,101,373

[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.