EQUITY PLANS, Valuation Assumptions (Details) - Jun. 30, 2015 - $ / shares	Total
Cablevision Systems Corporation 2015 Employee Stock Plan | Stock Options
Cablevision's Equity Plans [Abstract]
Expiration period from date of grant	10 years
Additional year due to death, expiration period	1 year
Cablevision Systems Corporation 2015 Employee Stock Plan | Stock Appreciation Rights (SARs)
Cablevision's Equity Plans [Abstract]
Expiration period from date of grant	10 years
Additional year due to death, expiration period	1 year
Cablevision Systems Corporation Employee Stock Plan | Stock Options
Cablevision's Equity Plans [Abstract]
Expiration period from date of grant	10 years
Vesting period	3 years
Annual vesting percentage (in hundredths)	33.33%
Assumptions Used to Calculate the Fair Value of Stock Option Awards Granted [Abstract]
Risk-free interest rate (in hundredths)	1.82%
Expected life (in years)	8 years
Dividend yield (in hundredths)	3.63%
Volatility (in hundredths)	39.98%
Grant date fair value (in dollars per share)	$ 5.45
CNYG Class A Common Stock | Cablevision Systems Corporation 2015 Employee Stock Plan
Cablevision's Equity Plans [Abstract]
Number of shares authorized	25,000,000