Document and Entity Information
Dec. 30, 2020
Cover [Abstract]  
Entity Registrant Name MAGNACHIP SEMICONDUCTOR Corp
Amendment Flag false
Entity Central Index Key 0001325702
Current Fiscal Year End Date --12-31
Document Type 8-K
Document Period End Date Dec. 30, 2020
Entity Incorporation State 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, City or Town Allée Scheffer
Entity Address, Postal Zip Code L-2520
Entity Address, Country LU
City Area Code (352)
Local Phone Number 45-62-62
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