CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Parent [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Common Class A Common Stock	Common Class B Common Stock
Beginning balance at Dec. 31, 2022	$ (503,912)	$ (475,211)	$ 182,701	$ (654,273)	$ 0	$ (8,201)	$ (28,701)	$ 2,719	$ 1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to CSC Holdings, LLC sole member	25,865	25,865		25,865
Net income attributable to noncontrolling interests	5,305						5,305
Pension liability adjustments, net of income taxes	(1,061)	(1,061)				1,061
Foreign currency translation adjustment	(190)	(188)				(188)	(2)
Share-based compensation benefit (equity classified)	(8,718)	(8,718)	(8,718)
Change in noncontrolling interest	(22,193)	(14,166)	(14,166)				(8,027)
Other, net	(82)	(82)	(67)					(15)
Ending balance at Mar. 31, 2023	(502,864)	(471,439)	159,750	(628,408)	0	(7,328)	(31,425)	2,704	1,843
Beginning balance at Dec. 31, 2022	(503,912)	(475,211)	182,701	(654,273)	0	(8,201)	(28,701)	2,719	1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to CSC Holdings, LLC sole member	171,004
Net income attributable to noncontrolling interests	21,825
Ending balance at Sep. 30, 2023	(321,341)	(305,089)	176,140	(483,269)	0	(2,507)	(16,252)	2,704	1,843
Beginning balance at Mar. 31, 2023	(502,864)	(471,439)	159,750	(628,408)	0	(7,328)	(31,425)	2,704	1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to CSC Holdings, LLC sole member	78,300	78,300		78,300
Net income attributable to noncontrolling interests	7,844						7,844
Pension liability adjustments, net of income taxes	(4,343)	(4,343)				4,343
Foreign currency translation adjustment	738	740				740	(2)
Share-based compensation benefit (equity classified)	9,091	9,091	9,091
Change in noncontrolling interest	575	175	175				400
Distributions to noncontrolling interests	(1,077)						(1,077)
Other, net	(83)	(83)	(83)
Ending balance at Jun. 30, 2023	(403,133)	(378,873)	168,933	(550,108)	0	(2,245)	(24,260)	2,704	1,843
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to CSC Holdings, LLC sole member	66,839	66,839		66,839
Net income attributable to noncontrolling interests	8,676						8,676
Pension liability adjustments, net of income taxes	(1,764)	(1,764)				1,764
Foreign currency translation adjustment	(2,030)	(2,026)				(2,026)	(4)
Share-based compensation benefit (equity classified)	6,062	6,062	6,062
Change in noncontrolling interest	512	1,176	1,176				(664)
Other, net	(31)	(31)	(31)
Ending balance at Sep. 30, 2023	(321,341)	(305,089)	176,140	(483,269)	0	(2,507)	(16,252)	2,704	1,843
Beginning balance at Dec. 31, 2023	(434,418)	(422,180)	187,186	(601,075)	0	(12,851)	(12,238)	2,718	1,842
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to CSC Holdings, LLC sole member	(21,193)	(21,193)		(21,193)
Net income attributable to noncontrolling interests	8,297						8,297
Pension liability adjustments, net of income taxes	(4,255)	(4,255)				4,255
Foreign currency translation adjustment	(612)	(612)				(612)
Share-based compensation benefit (equity classified)	6,484	6,484	6,484
Other, net	2,082	2,082	2,043		(10)			49
Ending balance at Mar. 31, 2024	(435,105)	(431,164)	195,713	(622,268)	(10)	(9,208)	(3,941)	2,767	1,842
Beginning balance at Dec. 31, 2023	(434,418)	(422,180)	187,186	(601,075)	0	(12,851)	(12,238)	2,718	1,842
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to CSC Holdings, LLC sole member	(48,802)
Net income attributable to noncontrolling interests	16,773
Ending balance at Sep. 30, 2024	(422,577)	(427,112)	225,467	(649,877)	(10)	(7,313)	4,535	2,779	1,842
Beginning balance at Mar. 31, 2024	(435,105)	(431,164)	195,713	(622,268)	(10)	(9,208)	(3,941)	2,767	1,842
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to CSC Holdings, LLC sole member	15,361	15,361		15,361
Net income attributable to noncontrolling interests	6,341						6,341
Pension liability adjustments, net of income taxes	(2,629)	(2,629)				2,629
Foreign currency translation adjustment	(205)	(205)				(205)
Share-based compensation benefit (equity classified)	15,147	15,147	15,147
Other, net	(862)	(862)	(868)					6
Ending balance at Jun. 30, 2024	(396,694)	(399,094)	209,992	(606,907)	(10)	(6,784)	2,400	2,773	1,842
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to CSC Holdings, LLC sole member	(42,970)	(42,970)		(42,970)
Net income attributable to noncontrolling interests	2,135						2,135
Pension liability adjustments, net of income taxes	943	943				(943)
Foreign currency translation adjustment	414	414				414
Share-based compensation benefit (equity classified)	16,188	16,188	16,188
Other, net	(707)	(707)	(713)					6
Ending balance at Sep. 30, 2024	$ (422,577)	$ (427,112)	$ 225,467	$ (649,877)	$ (10)	$ (7,313)	$ 4,535	$ 2,779	$ 1,842