CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue (including revenue from affiliates of $125 and $141, respectively) (See Note 14)	$ 2,329,714	$ 2,302,259
Operating expenses:
Programming and other direct costs (including charges from affiliates of $1,154 and $735, respectively) (See Note 14)	787,361	758,352
Other operating expenses (including charges from affiliates of $7,994 and $7,298, respectively) (See Note 14)	583,023	608,144
Restructuring and other expense	3,587	76,929
Depreciation and amortization (including impairments)	642,705	608,724
Total operating expenses	2,016,676	2,052,149
Operating income	313,038	250,110
Other income (expense):
Interest expense (including interest expense to affiliates and related parties of$47,588 in 2017) (See Note 14)	(377,258)	(433,294)
Interest income	3,103	232
Gain (loss) on investments and sale of affiliate interests, net	(248,602)	131,658
Gain (loss) on derivative contracts, net	168,352	(71,044)
Gain (loss) on interest rate swap contracts	(31,922)	2,342
Loss on extinguishment of debt and write-off of deferred financing costs	(4,705)	0
Other expense, net	(11,658)	(2,100)
Total other income (expense)	(502,690)	(372,206)
Loss before income taxes	(189,652)	(122,096)
Income tax benefit	60,703	45,908
Net loss	(128,949)	(76,188)
Net income attributable to noncontrolling interests	(2)	(237)
Net loss attributable to Altice USA, Inc. stockholders	$ (128,951)	$ (76,425)
Basic and diluted net loss per share (in dollars per share)	$ (0.17)	$ (0.12)
Basic and diluted weighted average common shares (in shares)	737,069	649,525