Cover Page - shares	3 Months Ended
	Mar. 31, 2022	Apr. 30, 2022
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Entity Registrant Name	Magnachip Semiconductor Corporation
Entity Central Index Key	0001325702
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Incorporation, State or Country Code	DE
Entity Common Stock, Shares Outstanding		44,894,385
Entity File Number	001-34791
Entity Tax Identification Number	83-0406195
Entity Address, Address Line One	c/o MagnaChip Semiconductor S.A. 1
Entity Address, City or Town	Allée Scheffer
Entity Address, Postal Zip Code	L-2520
City Area Code	352
Local Phone Number	45-62-62
Document Quarterly Report	true
Document Transition Report	false
Entity Address, Country	LU
Common Stock [Member]
Document 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 Information [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
No Trading Symbol Flag	true
Security Exchange Name	NYSE