SUPPLEMENTAL SCHEDULES (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Current assets	$ 739,268				$ 739,268		$ 730,992
Total assets	31,619,129				31,619,129		31,701,370
Current liabilities	2,241,810				2,241,810		2,254,796
Long-term debt, net of current maturities	25,214,989				25,214,989		24,872,015
Total liabilities	32,244,623				32,244,623		32,158,202
Noncontrolling interests	(1,379)				(1,379)		12,403
Total liabilities and stockholders' deficiency	31,619,129				31,619,129		31,701,370
Income Statement [Abstract]
Revenue	2,147,203		$ 2,240,755		4,299,485	$ 4,491,690
Operating expenses	1,836,080		1,739,173		3,644,904	3,596,954
Operating income	311,123		501,582		654,581	894,736
Other expense, net	(446,756)		(430,867)		(877,449)	(833,993)
Income (loss) before income taxes	(135,633)		70,715		(222,868)	60,743
Income tax benefit (expense)	47,647		(49,013)		63,611	(51,937)
Net income (loss)	(87,986)		21,702		(159,257)	8,806
Net loss (income) attributable to noncontrolling interests	(8,265)	$ (4,405)	(6,341)	$ (8,297)	(12,670)	(14,638)
Net income (loss) attributable to CSC Holdings, LLC sole member	(96,251)	(75,676)	15,361	(21,193)	(171,927)	(5,832)
Restricted Group
Balance Sheet Related Disclosures [Abstract]
Current assets	625,829				625,829
Long term assets	29,307,204				29,307,204
Total assets	29,933,033				29,933,033
Current liabilities	2,247,129				2,247,129
Long-term debt, net of current maturities	23,689,334				23,689,334
Long-term liabilities	4,493,916				4,493,916
Total liabilities	30,430,379				30,430,379
Total member's deficiency	(497,346)				(497,346)
Noncontrolling interests	0				0
Total deficiency	(497,346)				(497,346)
Total liabilities and stockholders' deficiency	29,933,033				29,933,033
Income Statement [Abstract]
Revenue	2,028,023		2,125,225		4,064,910	4,266,308
Operating expenses	1,761,036		1,656,798		3,489,604	3,436,561
Operating income	266,987		468,427		575,306	829,747
Other expense, net	(424,885)		(409,566)		(831,713)	(796,674)
Income (loss) before income taxes	(157,898)		58,861		(256,407)	33,073
Income tax benefit (expense)	51,622		(47,490)		69,052	(48,301)
Net income (loss)	(106,276)		11,371		(187,355)	(15,228)
Net loss (income) attributable to noncontrolling interests	0		0		0	0
Net income (loss) attributable to CSC Holdings, LLC sole member	(106,276)		11,371		(187,355)	(15,228)
Unrestricted Group
Balance Sheet Related Disclosures [Abstract]
Current assets	168,516				168,516
Long term assets	1,599,039				1,599,039
Total assets	1,767,555				1,767,555
Current liabilities	132,921				132,921
Long-term debt, net of current maturities	1,525,655				1,525,655
Long-term liabilities	247,891				247,891
Total liabilities	1,906,467				1,906,467
Total member's deficiency	(137,024)				(137,024)
Noncontrolling interests	(1,888)				(1,888)
Total deficiency	(138,912)				(138,912)
Total liabilities and stockholders' deficiency	1,767,555				1,767,555
Income Statement [Abstract]
Revenue	121,568		117,470		239,249	229,364
Operating expenses	82,186		84,327		166,258	164,398
Operating income	39,382		33,143		72,991	64,966
Other expense, net	(22,387)		(20,584)		(47,148)	(35,687)
Income (loss) before income taxes	16,995		12,559		25,843	29,279
Income tax benefit (expense)	(2,862)		(1,523)		(3,840)	(3,636)
Net income (loss)	14,133		11,036		22,003	25,643
Net loss (income) attributable to noncontrolling interests	(9,033)		(6,969)		(13,887)	(16,089)
Net income (loss) attributable to CSC Holdings, LLC sole member	5,100		4,067		8,116	9,554
Eliminations
Balance Sheet Related Disclosures [Abstract]
Current assets	(65,945)				(65,945)
Long term assets	(13,206)				(13,206)
Total assets	(79,151)				(79,151)
Current liabilities	(69,134)				(69,134)
Long-term debt, net of current maturities	0				0
Long-term liabilities	(10,468)				(10,468)
Total liabilities	(79,602)				(79,602)
Total member's deficiency	(58)				(58)
Noncontrolling interests	509				509
Total deficiency	451				451
Total liabilities and stockholders' deficiency	(79,151)				(79,151)
Income Statement [Abstract]
Revenue	(2,388)		(1,940)		(4,674)	(3,982)
Operating expenses	(2,400)		(1,952)		(4,697)	(4,005)
Operating income	12		12		23	23
Other expense, net	(887)		(717)		(1,406)	(1,632)
Income (loss) before income taxes	(875)		(705)		(1,383)	(1,609)
Income tax benefit (expense)	0		0		0	0
Net income (loss)	(875)		(705)		(1,383)	(1,609)
Net loss (income) attributable to noncontrolling interests	768		628		1,217	1,451
Net income (loss) attributable to CSC Holdings, LLC sole member	(107)		(77)		(166)	(158)
CSC Holdings
Balance Sheet Related Disclosures [Abstract]
Current assets	728,400				728,400		721,581
Long term assets	30,893,037				30,893,037
Total assets	31,621,437				31,621,437		31,706,411
Current liabilities	2,310,916				2,310,916		2,327,377
Long-term debt, net of current maturities	25,214,989				25,214,989		24,872,015
Long-term liabilities	4,731,339				4,731,339
Total liabilities	32,257,244				32,257,244		32,166,031
Total member's deficiency	(634,428)				(634,428)
Noncontrolling interests	(1,379)				(1,379)		12,403
Total deficiency	(635,807)	(531,476)	(400,201)	(438,611)	(635,807)	(400,201)	(459,620)	$ (437,925)
Total liabilities and stockholders' deficiency	31,621,437				31,621,437		$ 31,706,411
Income Statement [Abstract]
Revenue	2,147,203		2,240,755		4,299,485	4,491,690
Operating expenses	1,840,822		1,739,173		3,651,165	3,596,954
Operating income	306,381		501,582		648,320	894,736
Other expense, net	(448,159)		(430,867)		(880,267)	(833,993)
Income (loss) before income taxes	(141,778)		70,715		(231,947)	60,743
Income tax benefit (expense)	48,760		(49,013)		65,212	(51,937)
Net income (loss)	(93,018)		21,702		(166,735)	8,806
Net loss (income) attributable to noncontrolling interests	(8,265)	(4,405)	(6,341)	(8,297)	(12,670)	(14,638)
Net income (loss) attributable to CSC Holdings, LLC sole member	$ (101,283)	$ (78,122)	$ 15,361	$ (21,193)	$ (179,405)	$ (5,832)