AFFILIATE AND RELATED PARTY TRANSACTIONS - Amounts Due From and Due to Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	$ 189,391	$ 141,897
Other current liabilities	406,280	425,459
Interest expense on intercompany note payable to the Captive		1,619,970	$ 1,582,646
CSC Holdings
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	191,909	142,694
Other current liabilities	388,298	407,540
Cash distribution payments to Optimum Communications, net	(9,738)	(8,399)	(1,793)
Non-cash equity contributions from Optimum Communications, net		5,794	8,183
Interest expense on intercompany note payable to the Captive	1,781,107
CSC Holdings \| Paid-in Capital
Related Party Transaction [Line Items]
Non-cash equity contributions from Optimum Communications, net	43
Non-cash equity contributions from Optimum Communications, net		5,794	8,183
Related Party
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	475	314
Other current liabilities	27,029	26,944
Related Party \| CSC Holdings
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	2,821	905
Other current liabilities	26,944
Note payable to the Captive		90,500
Altice Management Americas \| Related Party
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	30	44
Other Related Party \| Related Party
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	445	270
Other current liabilities	2,091	0
Altice Management International \| Related Party
Related Party Transaction [Line Items]
Other current liabilities	24,938	26,944
Altice USA \| Related Party
Related Party Transaction [Line Items]
Amounts due from Optimum Communications	2,346	0
Captive \| Related Party
Related Party Transaction [Line Items]
Amounts due from (due to) the Captive	(201)
Amounts due from (due to) the Captive		591
Note payable to the Captive	92,500
Captive \| Related Party \| CSC Holdings
Related Party Transaction [Line Items]
Note payable to the Captive	82,500	90,500
Interest expense on intercompany note payable to the Captive	$ 5,234	$ 1,460	$ 0

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