CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (474,790)	$ (282,129)	$ (550,978)	$ (422,877)
Defined benefit pension plans:
Unrecognized actuarial loss	(4,333)	(982)	(4,333)	(982)
Applicable income taxes	1,733	393	1,733	393
Unrecognized loss arising during period, net of income taxes	(2,600)	(589)	(2,600)	(589)
Curtailment loss, net of settlement loss of $389 included in net periodic benefit cost	(2,806)	0	(2,806)	0
Applicable income taxes	1,122	0	1,122	0
Curtailment loss, net of settlement loss included in net periodic benefit cost, net of income taxes	(1,684)	0	(1,684)	0
Other comprehensive loss	(4,284)	(589)	(4,284)	(589)
Comprehensive loss	(479,074)	(282,718)	(555,262)	(423,466)
Comprehensive loss (income) attributable to noncontrolling interests	(365)	364	(602)	364
Comprehensive loss attributable to Altice USA, Inc. stockholders	$ (479,439)	$ (282,354)	$ (555,864)	$ (423,102)