CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue (including revenue from affiliates of $727, $253, $852 and $394, respectively) (See Note 14)	$ 2,364,153	$ 2,322,362	$ 4,693,867	$ 4,624,621
Operating expenses:
Programming and other direct costs (including charges from affiliates of $3,865, $1,095, $5,019 and $1,830, respectively) (See Note 14)	795,127	758,694	1,582,488	1,517,046
Other operating expenses (including charges from affiliates of $6,255, $8,666, $14,249 and $15,964, respectively) (See Note 14)	575,749	591,222	1,158,772	1,199,366
Restructuring and other expense	9,691	12,388	13,278	89,317
Depreciation and amortization (including impairments)	648,527	706,790	1,291,232	1,315,514
Total operating expenses	2,029,094	2,069,094	4,045,770	4,121,243
Operating income	335,059	253,268	648,097	503,378
Other income (expense):
Interest expense (including $42,817 and $90,405 related to affiliates and related parties in 2017) (See Note 9)	(390,543)	(420,370)	(767,801)	(853,664)
Interest income	5,313	180	8,416	412
Gain (loss) on investments and sale of affiliate interests, net	(45,113)	57,130	(293,715)	188,788
Gain (loss) on investments and sale of affiliate interests, net	(58,420)		(310,996)
Gain (loss) on derivative contracts, net	42,159	(66,463)	210,511	(137,507)
Gain (loss) on interest rate swap contracts	(12,929)	9,146	(44,851)	11,488
Loss on extinguishment of debt and write-off of deferred financing costs (including $513,723 related to affiliates and related parties in 2017) (See Note 10)	(36,911)	(561,382)	(41,616)	(561,382)
Other expense, net	(629)	(3,935)	(12,287)	(6,035)
Total other income (expense)	(438,653)	(985,694)	(941,343)	(1,357,900)
Loss before income taxes	(103,594)	(732,426)	(293,246)	(854,522)
Income tax benefit	5,590	252,487	66,293	298,395
Net loss	(98,004)	(479,939)	(226,953)	(556,127)
Net loss (income) attributable to noncontrolling interests			147	(602)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(149)	365	(147)	602
Net loss attributable to Altice USA, Inc. stockholders	$ (97,855)	$ (480,304)	$ (226,806)	$ (556,729)
Basic and diluted net loss per share (in dollars per share)	$ (0.13)	$ (0.73)	$ (0.31)	$ (0.85)
Basic and diluted weighted average common shares (in shares)	737,069	659,145	737,069	654,362