EQUITY PLANS, Valuation Assumptions (Details) (Cablevision Systems Corporation Employee Stock Plan [Member], USD $)	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Sep. 30, 2014
Cablevision Systems Corporation Employee Stock Plan [Member]
Cablevision's Equity Plans [Abstract]
Vesting period	3 years	3 years
Expiration period from date of grant	10 years	10 years
Assumptions Used to Calculate the Fair Value of Stock Option Awards Granted [Abstract]
Risk-free interest rate (in hundredths)	2.12%
Expected life	6 years 6 months
Dividend yield (in hundredths)	3.79%
Volatility (in hundredths)	42.80%
Grant date fair value (in dollars per share)	$ 5.27