CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue (including revenue from affiliates of $3,406 and $3,488 respectively) (See Note 15)	$ 2,478,821	$ 2,450,256
Operating expenses:
Programming and other direct costs (including charges from affiliates of $2,228 and $2,189 respectively) (See Note 15)	851,864	864,514
Other operating expenses (including charges from affiliates of $3,179 and $3,941 respectively) (See Note 15)	580,433	582,309
Restructuring and other expense	3,209	7,294
Depreciation and amortization (including impairments)	434,857	547,569
Total operating expenses	1,870,363	2,001,686
Operating income	608,458	448,570
Other income (expense):
Interest expense	(316,339)	(365,211)
Interest income	27	1,659
Gain (loss) on investments and sale of affiliate interests, net	73,453	(455,473)
Gain (loss) on derivative contracts related to change in the value of equity derivative contracts related to Comcast common stock	(53,565)	439,861
Gain (loss) on interest rate swap contracts, net of a gain of $74,835 recorded in the 2020 period in connection with the early termination of the swap agreements discussed below	75,653	(54,832)
Other income, net	2,859	923
Total other income (expense)	(217,912)	(433,073)
Income before income taxes	390,546	15,497
Income Tax Expense (Benefit)	(112,007)	(17,035)
Net income (loss)	278,539	(1,538)
Net loss (income) attributable to noncontrolling interests	(4,403)	680
Net income (loss) attributable to Altice USA, Inc. stockholders	$ 274,136	$ (858)
Income (loss) per share:
Basic income (loss) per share	$ 0.58	$ 0
Basic weighted average common shares (in thousands)	469,233	621,414
Diluted income (loss) per share	$ 0.58	$ 0
Diluted weighted average common shares (in thousands)	475,448	621,414
Cash dividends declared per common share	$ 0	$ 0