DEBT, Newsday LLC Credit Facility (Details) (Newsday Holdings LLC, USD $)	0 Months Ended	12 Months Ended
	Dec. 10, 2013	Dec. 31, 2014	Dec. 31, 2012 Facility
Floating Term Rate Loan Facility
Credit facility debt [Abstract]
Maximum credit borrowing capacity		$ 480,000,000
Repayment on credit facility	160,000,000
Senior notes due to Newsday		611,455,000
Deferred financing costs incurred		4,558,000
Cablevision senior notes purchased by CSC Holdings and cancelled by Cablevision	142,262,000
Minimum liquidity		25,000,000
Floating Term Rate Loan Facility | Base Rate
Credit facility debt [Abstract]
Basis spread on variable rate (in hundredths)		2.50%
Floating Term Rate Loan Facility | Eurodollar Rate
Credit facility debt [Abstract]
Basis spread on variable rate (in hundredths)		3.50%
Senior Secured Credit Facility
Credit facility debt [Abstract]
Maximum credit borrowing capacity			650,000,000
Number of credit facilities/components			2
Unamortized deferred financing costs written off			5,083,000
Fixed Term Rate Loan Facility
Credit facility debt [Abstract]
Maximum credit borrowing capacity			525,000,000
Interest rate (in hundredths)			10.50%
Floating Term Rate Loan Facility Maturing 2013
Credit facility debt [Abstract]
Maximum credit borrowing capacity			$ 125,000,000