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, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Payments for Repurchase of Common Stock				$ 0	$ 725,518
Share based compensation expense	$ 36,529	$ 27,646		77,061	55,927
Related party expense	5,274	4,165		12,349	6,166
Stock options | 2017 LTIP
Related Party Transaction [Line Items]
Share based compensation expense	19,910	24,473		42,407	48,696
Restricted Stock | 2019 LTIP
Related Party Transaction [Line Items]
Share based compensation expense	15,018	261		31,027	578
CSC Holdings
Related Party Transaction [Line Items]
Cash distributions to parent	0	(184,478)	$ (501,000)	0	(685,478)
Cash distributions				0	685,478
Non-cash distributions to parent		(19,660)	(748)
CSC Holdings | Member's Deficiency
Related Party Transaction [Line Items]
Cash distributions to parent		(184,478)	(501,000)
Non-cash distributions to parent	0	$ (19,660)	$ (748)	0	$ (20,408)
Affiliates
Related Party Transaction [Line Items]
Due from related parties and affiliates	3,790			3,790		$ 3,776
Due to related parties and affiliates	25,767			25,767		31,810
Affiliates | Altice Management Americas
Related Party Transaction [Line Items]
Due from related parties and affiliates	385			385		241
Affiliates | Other Related Party
Related Party Transaction [Line Items]
Due from related parties and affiliates	3,405			3,405		3,535
Due to related parties and affiliates	283			283		1,206
Affiliates | Altice Management International
Related Party Transaction [Line Items]
Due to related parties and affiliates	$ 25,484			$ 25,484		$ 30,604