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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation [Line Items]
Percentage of subsidiaries that file tax return		80.00%
Indefinite-lived cable franchise rights impairment		$ 1,611,308	$ 0	$ 0
Income Tax Expense (Benefit)		(96,908)	(4,071)	39,528
Unrecognized Tax Benefits	$ 114,365	117,731	114,365	53,010	$ 70,593
Increase (Decrease) in Deferred Income Taxes			105,278
Carried back capital losses	98,207
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		9,041	17,862	$ 1,475
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	36,126	45,167	36,126
Income tax benefit if prevail on all uncertain tax positions.		$ 93,727
Cablevision Lightpath \| Cablevision Lightpath
Effective Income Tax Rate Reconciliation [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		49.99%
I24News
Effective Income Tax Rate Reconciliation [Line Items]
Tax loss from transfer of business		$ 10,157
Qualified Opportunity Zone
Effective Income Tax Rate Reconciliation [Line Items]
Investment, Tax Basis, Unrealized Gain		600,000
Income Tax Expense (Benefit)		1,269
Unrecognized Tax Benefits	$ 12,920	$ 93,624	$ 12,920