| Document and Entity Information | Feb. 28, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 28, 2024 |
| Entity Registrant Name | Magnachip Semiconductor Corporation |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-34791 |
| Entity Tax Identification Number | 83-0406195 |
| Entity Address Address Line 1 | c/o Magnachip Semiconductor, Ltd. |
| Entity Address Address Line 2 | 15F, 76 Jikji-daero 436beon-gil, Heungdeok-gu |
| Entity Address Address Line 3 | 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 |
| Security 12b Title | 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 |
