Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 29, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Document Transition Report	false
Entity File Number	001-34791
Entity Registrant Name	Magnachip Semiconductor Corporation
Entity Central Index Key	0001325702
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	83-0406195
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Address, Address Line One	c/o Magnachip Semiconductor, Ltd.
Entity Address, Address Line Two	15F, 76 Jikji-daero 436beon-gil
Entity Address, City or Town	Heungdeok-gu
Entity Address, Country	KR
Entity Address, Postal Zip Code	28581
City Area Code	82
Local Phone Number	(2) 6903-3000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	MX
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		38,260,814
Document Financial Statement Error Correction [Flag]	false
Entity Public Float			$ 439,134,938
ICFR Auditor Attestation Flag	true
Auditor Name	Samil PricewaterhouseCoopers
Auditor Firm ID	1103
Auditor Location	Seoul, Korea