CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,538)	$ (25,198)
Defined benefit pension plans:
Unrecognized actuarial gain (loss)		4,918
Applicable income taxes		(1,292)
Unrecognized gain (loss) arising during period, net of income taxes	(9,871)	3,626
Settlement loss included in other expense, net		171
Applicable income taxes		(45)
Settlement loss included in other expense, net, net of income taxes	368	126
Foreign currency translation adjustment		(245)
Applicable income taxes		64
Foreign currency translation adjustment, net	(424)	(181)
Other comprehensive income (loss)	(9,927)	3,571
Comprehensive loss	(11,465)	(21,627)
Comprehensive loss attributable to noncontrolling interests		199
Comprehensive loss attributable to Altice USA, Inc. stockholders	$ (10,785)	$ (21,428)