BENEFIT PLANS, Plan Assumptions for Defined Benefit Plans (Details)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cablevision Defined Benefit Plans
Weighted-average assumptions used to determine net periodic benefit cost [Abstract]
Discount rate (in hundredths)	[1]	3.83%	4.24%	3.67%
Rate of increase in future compensation levels (in hundredths)		0.00%	3.50%	3.50%
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate (in hundredths)	[1]	3.94%	3.70%
Rate of increase in future compensation levels (in hundredths)		0.00%	3.50%
Pension Plan
Weighted-average assumptions used to determine net periodic benefit cost [Abstract]
Expected rate of return on plan assets (Pension Plan only) (in hundredths)		4.03%	4.53%	3.60%

[1] The discount rates of 3.83% and 4.24% in 2015 and 2014, respectively, represent the average of the quarterly discount rates used to remeasure the Company's projected benefit obligation and net periodic benefit cost in connection with the recognition of settlement losses discussed above.