CSC HOLDINGS - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 139,939	$ 20,594	$ 1,494,764
Defined benefit pension and postretirement plans:
Unrecognized actuarial gain		830	(18,632)
Applicable income taxes		(220)	7,441
Unrecognized gain (loss) arising during period, net of income taxes	8,430	610	(11,191)
Settlement loss included in other expense, net		1,268	1,845
Applicable income taxes		(342)	(738)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement Gain (Loss), After Tax	1,202	926	1,107
Curtailment loss		0	(3,195)
Applicable income taxes		0	1,278
Other Comprehensive Income (Loss), Defined Benefit Plan, Curtailment Gain (Loss), After Tax	0	0	(1,917)
Foreign currency translation adjustment		967	0
Applicable income taxes		(261)	0
Foreign currency translation adjustment, net of income taxes	(1,164)	706	0
Other comprehensive income (loss)	8,533	2,242	(12,001)
Comprehensive income	148,472	22,836	1,482,763
Comprehensive income attributable to noncontrolling interests		(1,761)	(1,587)
Comprehensive income attributable to Altice USA, Inc. stockholders	147,469	21,075	1,481,176
Applicable income taxes		0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	743	9,894
Amortization of actuarial losses included in other expense, net of tax	65	0	0
CSC Holdings
Net income	212,817	260,326	2,577,876
Defined benefit pension and postretirement plans:
Unrecognized actuarial gain	12,074	830	(18,632)
Applicable income taxes	(3,644)	(220)	7,441
Unrecognized gain (loss) arising during period, net of income taxes	8,430	610	(11,191)
Settlement loss included in other expense, net	1,643	1,268	1,845
Applicable income taxes	(441)	(342)	(738)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement Gain (Loss), After Tax	1,202	926	1,107
Curtailment loss	0	0	(3,195)
Applicable income taxes	0	0	1,278
Other Comprehensive Income (Loss), Defined Benefit Plan, Curtailment Gain (Loss), After Tax	0	0	(1,917)
Foreign currency translation adjustment	(1,164)	967	0
Applicable income taxes	0	(261)	0
Foreign currency translation adjustment, net of income taxes	(1,164)	706	0
Other comprehensive income (loss)	8,533	2,242	(12,001)
Comprehensive income	221,350	262,568	2,565,875
Comprehensive income attributable to noncontrolling interests	(1,003)	(1,761)	(1,587)
Comprehensive income attributable to Altice USA, Inc. stockholders	220,347	260,807	2,564,288
Applicable income taxes	(24)	0	0
Amortization of actuarial losses included in other expense, net of tax	65	0	0
Amortization of actuarial losses	$ 89	$ 0	$ 0