| Document and Entity Information | Sep. 06, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 06, 2023 |
| Entity Registrant Name | Magnachip Semiconductor Corporation |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-34791 |
| Entity Tax Identification Number | 83-0406195 |
| Entity Address, Address Line One | c/o Magnachip Semiconductor, Ltd. |
| Entity Address, Address Line Two | 15F, 76 Jikji-daero 436beon-gil, Heungdeok-gu |
| Entity Address, Address Line Three | Cheongju-si |
| Entity Address, City or Town | Chungcheongbuk-do |
| Entity Address, Postal Zip Code | 28581 |
| Entity Address, Country | KR |
| Country Region | 82 |
| City Area Code | 2 |
| Local Phone Number | 6903-3000 |
| 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 | MX |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001325702 |
