CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue (including revenue from affiliates of $496, $727, $1,088 and $852, respectively) (See Note 15)	$ 2,451,081	$ 2,364,153	$ 4,847,648	$ 4,693,867
Operating expenses:
Programming and other direct costs (including charges from affiliates of $2,087, $3,865, $3,774 and $5,019 respectively) (See Note 15)	818,994	795,127	1,631,979	1,582,488
Other operating expenses (including charges from affiliates of $2,020, $6,255, $4,266 and $14,249, respectively) (See Note 15)	569,459	575,749	1,133,891	1,158,772
Restructuring and other expense	11,465	9,691	26,709	13,278
Depreciation and amortization (including impairments)	568,620	648,527	1,130,048	1,291,232
Total operating expenses	1,968,538	2,029,094	3,922,627	4,045,770
Operating income	482,543	335,059	925,021	648,097
Other income (expense):
Interest expense	(381,218)	(390,543)	(769,501)	(767,801)
Interest income	605	5,313	2,424	8,416
Gain (loss) on investments and sale of affiliate interests, net	103,146	(45,113)	357,871	(293,715)
Gain (loss) on derivative contracts, net	(49,624)	42,159	(226,653)	210,511
Loss on interest rate swap contracts	(26,900)	(12,929)	(50,572)	(44,851)
Loss on extinguishment of debt and write-off of deferred financing costs	(1,194)	(36,911)	(159,096)	(41,616)
Other income (expense), net	212	(629)	292	(12,287)
Total other income (expense)	(354,973)	(438,653)	(845,235)	(941,343)
Income (loss) before income taxes	127,570	(103,594)	79,786	(293,246)
Income tax benefit (expense)	(41,160)	5,590	(18,574)	66,293
Net income (loss)	86,410	(98,004)	61,212	(226,953)
Net loss (income) attributable to noncontrolling interests	(43)	149	156	147
Net income (loss) attributable to Altice USA, Inc. stockholders	$ 86,367	$ (97,855)	$ 61,368	$ (226,806)
Income (loss) per share:
Basic income (loss) per share (in dollars per share)	$ 0.13	$ (0.13)	$ 0.09	$ (0.31)
Basic weighted average common shares (in shares)	668,031	737,069	681,703	737,069
Diluted income (loss) per share (in dollars per share)	$ 0.13	$ (0.13)	$ 0.09	$ (0.31)
Diluted weighted average common shares (in shares)	668,648	737,069	682,014	737,069
Cash dividends declared per common share (in dollars per share)	$ 0	$ 0	$ 0	$ 0