| Cover page Document | Aug. 03, 2020 | Jun. 02, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Aug. 3, 2020 | |
| Entity Registrant Name | Altice USA, Inc. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-38126 | |
| Entity Tax Identification Number | 38-3980194 | |
| Entity Address, Address Line One | 1 Court Square West | |
| Entity Address, City or Town | Long Island City, | |
| Entity Address, State or Province | NY | |
| Entity Address, Postal Zip Code | 11101 | |
| City Area Code | 516 | |
| Local Phone Number | 803-2300 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Class A Common Stock, par value $0.01 per share | |
| Trading Symbol | ATUS | |
| Security Exchange Name | NYSE | |
| Entity Central Index Key | 0001702780 | |
| Amendment Flag | false | |
| Entity Emerging Growth Company | false |
