CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 111,477		$ 86,410		$ 109,939	$ 61,212
Defined benefit pension plans:
Unrecognized actuarial gain (loss)			(8,567)			(3,648)
Applicable income taxes			2,282			989
Unrecognized gain (loss) arising during period, net of income taxes	1,377		(6,285)		(8,493)	(2,659)
Settlement loss included in other expense, net			367			538
Applicable income taxes			(101)			(147)
Settlement loss included in other expense, net, net of income taxes	199		266		566	391
Foreign currency translation adjustment			(336)			(580)
Applicable income taxes			93			157
Foreign currency translation adjustment, net	(517)	$ (424)	(243)	$ (181)	(941)	(423)
Other comprehensive income (loss)	1,059		(6,262)		(8,868)	(2,691)
Comprehensive income	112,536		80,148		101,071	58,521
Comprehensive loss (income) attributable to noncontrolling interests			(43)			156
Comprehensive income attributable to Altice USA, Inc. stockholders	$ 112,323		$ 80,105		$ 101,538	$ 58,677