| Document and Entity Information | Nov. 02, 2022 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 02, 2022 |
| 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 S.A. |
| Entity Address, Address Line Two | 1, Allée Scheffer, |
| Entity Address, Postal Zip Code | L-2520 |
| Entity Address, City or Town | Luxembourg |
| Entity Address, Country | LU |
| Country Region | 352 |
| City Area Code | 45 |
| Local Phone Number | 62-62 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001325702 |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | MX |
| Security Exchange Name | NYSE |
| Preferred Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Title of 12(b) Security | Preferred Stock Purchase Rights |
| Security Exchange Name | NYSE |
| No Trading Symbol Flag | true |
