INCOME TAXES - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal tax expense at statutory rate	$ 24,899	$ 108,513	$ 274,240
State income taxes, net of federal impact	6,436	26,527	21,492
Minority interest	(5,494)	(5,914)	(5,092)
Changes in the valuation allowance	13,847	20,176	13,573
Change in New York state rate to measure deferred taxes, net of federal impact	0	112,117	0
Other changes in the state rates used to measure deferred taxes, net of federal impact	23,909	(9,603)	(6,924)
Tax expense (benefit) relating to uncertain tax positions	14,311	(36,281)	(24,580)
Tax credits	4,201	3,544	2,500
Excess tax deficiencies (benefits) related to share-based compensation including non-deductible carried unit plans	11,696	10,321	(2,602)
Non-deductible officers compensation	3,934	4,916	7,201
Foreign losses of disregarded entities	(6,097)	(6,352)	0
Business dispositions	(46,591)	0	(12,643)
Goodwill impairment	34,241	0	0
Other permanent differences		0	(22,613)
Other, net	(2,740)	2,402	6,263
Income tax expense	39,528	295,840	294,975
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	326	354
Research and Development Expense	33,427	22,292
Prepaid Expense and Other Assets, Current	174,859	130,684
Other Accrued Liabilities, Current	470,096	278,580
Related Party
Prepaid Expense and Other Assets, Current	407	572
Other Accrued Liabilities, Current	71,523	20,857
Altice Management Americas | Related Party
Prepaid Expense and Other Assets, Current	137	529
Other Related Party | Related Party
Prepaid Expense and Other Assets, Current	270	43
Other Accrued Liabilities, Current	25,216	1,646
Altice Management International | Related Party
Other Accrued Liabilities, Current	46,307	19,211
CSC Holdings
Federal tax expense at statutory rate	24,899	108,513	274,240
State income taxes, net of federal impact	9,842	28,768	13,973
Minority interest	(5,494)	(5,914)	(5,092)
Changes in the valuation allowance	14,099	15,494	12,793
Change in New York state rate to measure deferred taxes, net of federal impact	0	112,117	0
Other changes in the state rates used to measure deferred taxes, net of federal impact	23,300	(10,849)	(7,125)
Tax expense (benefit) relating to uncertain tax positions	(14,311)	(36,281)	(24,580)
Tax credits	4,201	3,544	2,500
Excess tax deficiencies (benefits) related to share-based compensation including non-deductible carried unit plans	11,696	10,321	(2,602)
Non-deductible officers compensation	3,934	4,916	7,201
Foreign losses of disregarded entities	(6,097)	(6,352)	0
Business dispositions	(46,591)	0	(12,643)
Goodwill impairment	34,241	0	0
Other permanent differences	0	0	(22,613)
Other, net	(2,740)	2,401	16,898
Income tax expense	42,577	292,152	$ 297,110
Prepaid Expense and Other Assets, Current	174,859	130,684
Other Accrued Liabilities, Current	470,097	278,580
CSC Holdings | Related Party
Prepaid Expense and Other Assets, Current	407	572
Other Accrued Liabilities, Current	$ 71,523	$ 20,857