EQUITY AND LONG-TERM INCENTIVE PLANS, Long-term Incentive Plans (Details) (Cablevision Systems Corporation Cash Incentive Plan, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cablevision Systems Corporation Cash Incentive Plan
Long-Term Incentive Plans [Abstract]
Long-term incentive awards compensation expense	$ 43,892	$ 24,596	$ 10,167
Accrued long-term performance-based awards for which performance criteria has not yet been met	$ 42,653