CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (128,949)	$ (76,188)
Defined benefit pension plans:
Unrecognized actuarial gain	4,551	0
Applicable income taxes	(1,228)	0
Unrecognized gain arising during period, net of income taxes	3,323	0
Settlement losses included in other expense, net	606	0
Applicable income taxes	(164)	0
Settlement losses included in other expense, net, net of income taxes	442	0
Other comprehensive gain	3,765	0
Comprehensive loss	(125,184)	(76,188)
Comprehensive income attributable to noncontrolling interests	(2)	(237)
Comprehensive loss attributable to Altice USA, Inc. stockholders	$ (125,186)	$ (76,425)