| Cover | Feb. 24, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 24, 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 |
