SEGMENT INFORMATION - Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information, Capital Expenditures [Abstract]
Capital expenditures	$ 202,235	$ 63,365	$ 459,662	$ 129,570
Cablevision Systems Corp.
Segment Reporting Information, Capital Expenditures [Abstract]
Capital expenditures	137,238	150	321,637	150
Cequel Corp.
Segment Reporting Information, Capital Expenditures [Abstract]
Capital expenditures	$ 64,997	$ 63,215	$ 138,025	$ 129,420