| Cover | Aug. 03, 2021 | May 05, 2021 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Aug. 3, 2021 | |
| Entity Registrant Name | TELLURIAN INC. /DE/ | |
| Entity Central Index Key | 0000061398 | |
| Amendment Flag | false | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-5507 | |
| Entity Tax Identification Number | 06-0842255 | |
| Entity Address, Address Line One | 1201 Louisiana Street, | |
| Entity Address, Address Line Two | Suite 3100, | |
| Entity Address, City or Town | Houston, | |
| Entity Address, State or Province | TX | |
| Entity Address, Postal Zip Code | 77002 | |
| City Area Code | 832 | |
| Local Phone Number | 962-4000 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common stock, par value $0.01 per share | |
| Trading Symbol | TELL | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | false |
