INTANGIBLE ASSETS - Summary of Acquired Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Acquired Indefinite-lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 226,052	$ 317,219	$ 457,869	$ 555,238
Cable television franchises	13,020,081		13,020,081		$ 13,020,081
Goodwill	8,004,808		8,004,808		8,019,861
Total	21,024,889		21,024,889		21,039,942
Cablevision
Acquired Indefinite-lived Intangible Assets [Line Items]
Cable television franchises	8,113,575		8,113,575		8,113,575
Goodwill	5,866,108		5,866,108		5,866,120
Total	13,979,683		13,979,683		13,979,695
Cequel
Acquired Indefinite-lived Intangible Assets [Line Items]
Cable television franchises	4,906,506		4,906,506		4,906,506
Goodwill	2,138,700		2,138,700		2,153,741
Total	$ 7,045,206		$ 7,045,206		$ 7,060,247