INCOME TAXES - Income Tax Expense (Benefit) Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current expense (benefit):
Federal	$ 312,330	$ 227,189	$ 133,329
State	6,626	54,130	81,076
Foreign	0	105	128
Total current expense (benefit)	318,956	281,424	214,533
Deferred expense (benefit):
Federal	(321,244)	(210,378)	(43,797)
State	(74,872)	(16,547)	80,356
Foreign	64	10	(174)
Total deferred benefit	(396,052)	(226,915)	36,385
Income tax expense (benefit) before tax benefit relating to uncertain tax positions	(77,096)	54,509	250,918
Tax benefit relating to uncertain tax positions, adj	73,025	(14,981)	44,922
Income Tax Expense (Benefit)	$ (4,071)	39,528	295,840
Cablevision Lightpath | Cablevision Lightpath
Deferred expense (benefit):
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	49.99%
CSC Holdings
Current expense (benefit):
Federal	$ 311,628	227,189	133,329
State	6,626	62,312	88,068
Foreign	0	105	128
Total current expense (benefit)	318,254	289,606	221,525
Deferred expense (benefit):
Federal	(321,245)	(210,378)	(43,797)
State	(78,370)	(21,680)	69,676
Foreign	64	10	(174)
Total deferred benefit	(399,551)	(232,048)	25,705
Income tax expense (benefit) before tax benefit relating to uncertain tax positions	(81,297)	57,558	247,230
Tax benefit relating to uncertain tax positions, adj	73,025	(14,981)	44,922
Income Tax Expense (Benefit)	$ (8,272)	$ 42,577	$ 292,152