SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) vote shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Class of Stock [Line Items]
Advertising costs	$ 274,639	$ 213,474	$ 233,326
Antidilutive securities | shares	15,856,000	25,768,000	4,245,000
Concentration Risk, Customer	10
Document Period End Date	Dec. 31, 2021
concentration of customer to trade receivables	10.00%
CSC Holdings
Class of Stock [Line Items]
Membership units outstanding | shares	100
Distributions to parent	$ 763,435	$ 4,794,408	$ 2,279,472
Distribution Made to Limited Liability Company (LLC) Member, Non-cash Distributions Paid	$ 19,500
Common Class A
Class of Stock [Line Items]
Common stock number of votes per share | vote	1
Common Class B
Class of Stock [Line Items]
Common stock number of votes per share | vote	25
Common stock conversion ratio	1
Minimum | Customer Contracts
Class of Stock [Line Items]
Finite-lived intangible asset, useful life	3 years
Maximum | Customer Contracts
Class of Stock [Line Items]
Finite-lived intangible asset, useful life	5 years
Franchise
Class of Stock [Line Items]
Franchise fees and other taxes and fees	$ 257,364	$ 257,405	$ 254,227