| Document And Entity Information | Nov. 12, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 12, 2024 |
| Entity Registrant Name | Montauk Renewables, Inc. |
| Entity Central Index Key | 0001826600 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-39919 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 85-3189583 |
| Entity Address, Address Line One | 5313 Campbells Run Road |
| Entity Address, Address Line Two | Suite 200 |
| Entity Address, City or Town | Pittsburgh |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 15205 |
| City Area Code | (412) |
| Local Phone Number | 747-8700 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | MNTK |
| Security Exchange Name | NASDAQ |
