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AFFILIATE AND RELATED PARTY TRANSACTIONS - Amounts Due From and Due to Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Treasury Stock, Shares, Acquired		6,629,415			25,655
Payments for Repurchase of Common Stock					$ 725,518	$ 1,381,235
Share based compensation expense	$ 27,646		$ 34,318		55,927	62,264
Related party expense	4,165		520		$ 6,166	3,162
Stock options | 2017 LTIP
Related Party Transaction [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					896,398
Share based compensation expense	24,473		25,327		$ 48,696	45,676
Restricted Stock | 2019 LTIP
Related Party Transaction [Line Items]
Share based compensation expense	261		635		578	1,211
CSC Holdings
Related Party Transaction [Line Items]
Cash distributions to parent	(184,478)	$ (501,000)	(652,383)	$ (720,350)	(685,478)	(1,372,733)
Intercompany settlement			35,415
Cash distributions					685,478	1,372,733
Non-cash distributions to parent	(19,660)	(748)		(150,602)
CSC Holdings | Member's Equity (Deficiency)
Related Party Transaction [Line Items]
Cash distributions to parent	(184,478)	(501,000)	(652,383)	(720,350)
Intercompany settlement			$ 35,415
Non-cash distributions to parent	(19,660)	$ (748)		$ (150,602)	(20,408)	$ (115,187)
Affiliates
Related Party Transaction [Line Items]
Due to related parties and affiliates	14,450				14,450		$ 8,538
Affiliates | Other Related Party
Related Party Transaction [Line Items]
Due from related parties and affiliates	3,669				3,669		4,262
Due to related parties and affiliates	864				864		600
Affiliates | Altice Management International
Related Party Transaction [Line Items]
Due to related parties and affiliates	$ 13,586				$ 13,586		$ 7,938

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