CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	CSC Holdings	Parent [Member]	Parent [Member] CSC Holdings	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	AOCI Attributable to Parent [Member] CSC Holdings	Noncontrolling Interests	Noncontrolling Interests CSC Holdings	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] CSC Holdings	Treasury Stock, Common	Common Class A Common Stock	Common Class B Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Members' Equity												$ 4,001,628
Accumulated other comprehensive income								$ (11,783)
Total member's deficiency				$ 3,989,845
Noncontrolling interests										$ 9,295
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		$ 3,999,140
Beginning balance at Dec. 31, 2018	$ 3,680,236		$ 3,670,941		$ 251,830		$ (11,783)		$ 9,295		$ 3,423,803			$ 4,961	$ 2,130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Altice USA, Inc. stockholders	138,936	211,814	138,936	211,814	138,936
Net income attributable to noncontrolling interests	1,003	1,003							1,003	1,003
Pension liability adjustments, net of income taxes	(9,697)	(9,697)	(9,697)	(9,697)			(9,697)	(9,697)
Foreign currency translation adjustment, net	(1,164)	(1,164)	(1,164)	(1,164)			(1,164)	(1,164)
Share-based compensation expense (equity classified)	99,077	99,077	99,077	99,077							99,077	99,077
Redeemable equity vested	187,966	187,967	187,966	187,967							187,966	187,967
Change in redeemable equity	(166,511)	(166,511)	(166,511)	(166,511)							(166,511)	(166,511)
Class A shares acquired through share repurchase program and retired	(1,686,873)		(1,686,873)								(1,686,146)			(727)
Conversion of Class B to Class A shares														268	(268)
Issuance of common shares pursuant to employee long term incentive plan	7,122		7,122			$ 42					7,099			(65)
Issuance of common shares to acquire partnership interests in Neptune LP						(163,862)					(163,862)
Class A shares issued in connection with acquisition	(10,773)	10,773	(10,773)	10,773							(10,768)	10,773		5
Ending balance at Dec. 31, 2019	2,279,262		2,269,964		390,766	(163,904)	(3,250)		9,298		2,039,918			4,572	1,862
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from the sale of a noncontrolling interest in Lightpath, net of expenses	1,000								1,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		1,000								1,000
Contributions from (distributions to) parent, net	151,455	151,455		(151,455)								151,455
Members' Equity												2,047,397
Accumulated other comprehensive income								(3,250)
Total member's deficiency				2,044,147
Noncontrolling interests										9,298
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		2,053,445
Net income attributable to Altice USA, Inc. stockholders	436,183	448,542	436,183	448,542
Net income attributable to noncontrolling interests	7,296	7,296							7,296	7,296
Pension liability adjustments, net of income taxes	(9,063)	(9,063)	(9,063)	(9,063)			(9,063)	(9,063)
Foreign currency translation adjustment, net	(2,167)	(2,167)	(2,167)	(2,167)			(2,167)	(2,167)
Share-based compensation expense (equity classified)	122,811	122,811	122,811	122,811							122,811	122,811
Redeemable equity vested	96,918	96,918	96,918	96,918							96,918	96,918
Change in redeemable equity	(14,130)	(14,130)	(14,130)	(14,130)							(14,130)	(14,130)
Class A shares acquired through share repurchase program and retired	(4,816,895)		(4,816,895)		1,812,590						(3,002,693)			(1,612)
Conversion of Class B to Class A shares														3	(3)
Issuance of common shares pursuant to employee long term incentive plan	(15,752)		(15,752)								(15,705)		$ (38)	(9)
Gain on sale of minority interest in subsidiary	650,270	(650,444)	741,471	(741,645)					91,201	(91,201)	741,471	(741,645)
Ending balance at Dec. 31, 2020	(1,203,139)		(1,141,030)		(985,641)	(163,866)	3,646		(62,109)		0			2,972	1,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Proceeds from the sale of a noncontrolling interest in Lightpath, net of expenses		12,498								12,498
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(12,498)								(12,498)
Contributions from (distributions to) parent, net	178,720	178,720										178,720
Noncash distribution to parent				178,720
Members' Equity												(1,172,505)
Accumulated other comprehensive income	3,646	3,646						3,646
Total member's deficiency		(1,168,859)		(1,168,859)
Noncontrolling interests	(62,109)	(62,109)								(62,109)
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		(1,230,968)
Net income attributable to Altice USA, Inc. stockholders	990,311	988,176	990,311	988,176
Net income attributable to noncontrolling interests	20,621	20,621							20,621	20,621
Pension liability adjustments, net of income taxes	(3,513)	(3,513)	(3,513)	(3,513)			(3,513)	(3,513)
Foreign currency translation adjustment, net	(662)	(662)	(662)	(662)			(662)	(662)
Share-based compensation expense (equity classified)	97,511	97,511	97,511	97,511	79,521						17,990	97,511
Redeemable equity vested	23,749	23,749	23,749	23,749	23,749						0	23,749
Change in redeemable equity	2,014	2,014	2,014	2,014	(2,014)						0	2,014
Class A shares acquired through share repurchase program and retired	(804,928)		(804,928)		804,692						0			(236)
Conversion of Class B to Class A shares														16	(16)
Issuance of common shares pursuant to employee long term incentive plan	(13,900)		(13,900)		149,932						(15)		$ (163,866)	49
Other	212	(212)		4,166	(4,166)				4,378	(4,378)		4,166		(4,166)
Ending balance at Dec. 31, 2021	(870,902)		$ (819,788)		$ (848,836)	$ 0	$ 6,497		$ (51,114)		$ 18,005			$ 2,703	$ 1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		14,004								14,004
Contributions from (distributions to) parent, net	(19,500)
Distribution Made to Limited Liability Company (LLC) Member, Non-cash Distributions Paid		(19,500)		(19,500)								(19,500)
Members' Equity												$ (848,156)
Accumulated other comprehensive income	6,497	6,497						$ 6,497
Total member's deficiency		(841,659)		$ (841,659)
Noncontrolling interests	$ (51,114)	(51,114)								$ (51,114)
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		$ (892,773)