EQUITY PLANS, Valuation Assumptions (Details) (Cablevision Systems Corporation Employee Stock Plan [Member], Stock Options [Member], USD $)	3 Months Ended
	Mar. 31, 2013
Cablevision Systems Corporation Employee Stock Plan [Member] | Stock Options [Member]
Cablevision's Equity Plans [Abstract]
Vesting period (in years)	3 years
Expiration period from date of grant (in years)	10 years
Assumptions Used to Calculate the Fair Value of Stock Option Awards Granted [Abstract]
Risk-free interest rate (in hundredths)	1.25%
Expected life (in years)	6 years 6 months
Dividend yield (in hundredths)	3.86%
Volatility (in hundredths)	42.31%
Grant date fair value (in dollars per share)	$ 3.96