Subsequent Events	12 Months Ended
Dec. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	25. Subsequent Events Matters Related to the Audit Committee’s Review, the Restatement of Certain of the Company’s Consolidated Financial Statements, the State of the Company’s Internal Control Over Financial Reporting and the Company’s Failure to Timely File Periodic Reports with the SEC *Securities Class Action Complaint* On March 12, 2014, a purported class action was filed against the Company and certain of the Company’s current and now-former officers on behalf of shareholders who purchased or acquired the Company’s securities between February 1, 2012 and March 11, 2014. On September 30, 2014, an amended complaint was filed against the Company, certain current and now-former officers of the Company, certain members of the Company’s Board of Directors, and a shareholder of the Company, alleging violations of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder. The action, Thomas et al., v. MagnaChip Semiconductor Corp., et al., No. 3:14-CV-1160, is pending in the Northern District of California. The Court has granted the plaintiffs thirty days from the date the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 (the “2013 Form 10-K”) is filed with the U.S. Securities and Exchange Commission (the “SEC”) to file and serve a further amended complaint. At this time, the Company is unable to estimate any reasonably possible loss, or range of reasonably possible losses, with respect to the matters described above. *SEC Enforcement Staff Investigation* In addition, in March 2014, the Company voluntarily reported to the SEC that the Audit Committee had determined that the Company incorrectly recognized revenue on certain transactions and as a result would restate its financial statements, and that the Audit Committee had commenced the Independent Investigation. Over the course of 2014, the Company voluntarily produced documents to the SEC regarding the various accounting issues identified during the Independent Investigation, and whether the Company’s hiring of an accountant from the Company’s independent registered public accounting firm impacted that accounting firm’s independence. On July 22, 2014, the Staff of the SEC’s Division of Enforcement obtained a Formal Order of Investigation. The Company will continue to cooperate with the SEC in this investigation. At this time, the Company is unable to estimate any reasonably possible loss, or range of reasonably possible losses, with respect to the matters described above. *Late Filings and NYSE Actions* On April 4, 2014, the Company filed a Current Report on Form 8-K with the SEC announcing that on April 2, 2014 the Company received from NYSE Regulation, Inc. (the “NYSE”) a notice of failure to satisfy a continued listing rule or standard and related monitoring. The notice informed the Company that, as a result of the failure to timely file the 2013 Form 10-K, the Company is subject to the procedures specified in Section 802.01E (SEC Annual Report Timely Filing Criteria) of the NYSE Listed Company Manual (“Section 802.01E”). Under the Section 802.01E procedures, the NYSE will monitor the status of the filing of the 2013 Form 10-K and related public disclosures for up to a six-month period from its due date. If the Company did not file the 2013 Form 10-K within six months from the filing due date, the NYSE may, in its sole discretion, allow the Company’s common stock to trade for up to an additional six months pending the filing of the 2013 Form 10-K prior to commencing suspension or delisting procedures, depending on the Company’s specific circumstances. On September 5, 2014, the Company made a request to the NYSE that its shares are permitted to continue to trade on the NYSE while the Company completed its restatement of the consolidated financial statements. On October 3, 2014, the Company received an extension for continued listing and trading of the Company’s common stock on the NYSE. The extension, subject to ongoing reassessment by the NYSE, provided the Company with an additional trading period until April 1, 2015, during which the Company can file its 2013 Form 10-K with the SEC. On February 12, 2015, the Company filed its 2013 Form 10-K, and simultaneously filed its Form 10-Q for each of the quarters ended March 31, 2014, June 30, 2014 and September 30, 2014. The Company believes that these filings with the SEC satisfy the NYSE continued listing requirements. *2021 Notes indenture reporting covenant default* As disclosed in the Company’s Form 8-K filed on June 25, 2014, the Company received a notice of default on June 20, 2014 (the “10-K and Q1 10-Q Notice of Default”) from the Trustee under the Indenture. The 10-K and Q1 10-Q Notice of Default related to the failure by the Company, pursuant to Section 4.03 of the Indenture, to file with the SEC its Annual Report on Form 10-K for the fiscal year ended December 31, 2013 and its Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2014 (the “Initial Reporting Defaults”). The Company did not cure the Initial Reporting Defaults within the applicable 60-day grace period and the Initial Reporting Defaults ripened into Events of Default. The Company elected, as the sole and exclusive remedy for the Events of Default, to pay additional interest on the Notes at a rate equal to 0.25% per annum of the principal amount of the Notes (the “Additional Interest”) for a period of 180 days following the occurrence of the Events of Default (the “Additional Interest Period”). On August 20, 2014, the Company received a notice of default related to its failure to file its Form 10-Q for the fiscal quarter ended June 30, 2014 (the “Q2 10-Q Notice of Default”), and on November 19, 2014, the Company received a notice of default related to its failure to file its Form 10-Q for the fiscal quarter ended September 30, 2014 (the “Q3 10-Q Notice of Default”). These defaults also ripened into Events of Default and on December 29, 2014 and January 15, 2015, respectively, the Company elected to extend the Additional Interest Period for up to 180 days following each additional Event of Default. Upon the filing with the SEC of this Report and expected filing of the Form 10-Qs for each of the fiscal quarters ended March 31, 2014, June 30, 2014 and September 30, 2014, the Company believes it will regain compliance with its reporting obligations under the Indenture, cure all identified covenant defaults in each of the 10-K and Q1 10-Q Notice of Default, the Q2 10-Q Notice of Default, and the Q3 10-Q Notice of Default, and cease accruing the Additional Interest on the Notes as of the filing date of 10-Q for the fiscal quarter ended September 30, 2014. *Early termination of derivative contracts* On September 1, 2014, the Company and the counterparty, the Goldman Sachs International bank (“GS”), mutually agreed to terminate a zero cost collar contract under termination provisions of the International Swaps and Derivatives Association (“ISDA”) agreement. In connection with this termination, the Company received $1,050 thousand for settlement proceeds from GS. On September 30, 2014, the Company and the counterparty, the UBS AG, Seoul Branch (“UBS”), mutually agreed to terminate a zero cost collar contract under termination provisions of the ISDA agreement. In connection with this termination, the Company received $430 thousand for settlement proceeds from UBS. *Close of a fabrication facility* On December 4, 2014, the Company approved a plan to close its six-inch fabrication facility in Cheongju, South Korea (the “6-inch fab”). This plan is expected to be substantially implemented over the next 12 months, and the 6-inch fab is expected to be closed by the end of 2015. The Company plans to transfer the 6-inch fab employees to the Company’s other facilities.

25. Subsequent Events

Matters Related to the Audit Committee’s Review, the Restatement of Certain of the Company’s Consolidated Financial Statements, the State of the Company’s Internal Control Over Financial Reporting and the Company’s Failure to Timely File Periodic Reports with the SEC

Securities Class Action Complaint

On March 12, 2014, a purported class action was filed against the Company and certain of the Company’s current and now-former officers on behalf of shareholders who purchased or acquired the Company’s securities between February 1, 2012 and March 11, 2014. On September 30, 2014, an amended complaint was filed against the Company, certain current and now-former officers of the Company, certain members of the Company’s Board of Directors, and a shareholder of the Company, alleging violations of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder. The action, Thomas et al., v. MagnaChip Semiconductor Corp., et al., No. 3:14-CV-1160, is pending in the Northern District of California. The Court has granted the plaintiffs thirty days from the date the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 (the “2013 Form 10-K”) is filed with the U.S. Securities and Exchange Commission (the “SEC”) to file and serve a further amended complaint. At this time, the Company is unable to estimate any reasonably possible loss, or range of reasonably possible losses, with respect to the matters described above.

SEC Enforcement Staff Investigation

In addition, in March 2014, the Company voluntarily reported to the SEC that the Audit Committee had determined that the Company incorrectly recognized revenue on certain transactions and as a result would restate its financial statements, and that the Audit Committee had commenced the Independent Investigation. Over the course of 2014, the Company voluntarily produced documents to the SEC regarding the various accounting issues identified during the Independent Investigation, and whether the Company’s hiring of an accountant from the Company’s independent registered public accounting firm impacted that accounting firm’s independence. On July 22, 2014, the Staff of the SEC’s Division of Enforcement obtained a Formal Order of Investigation. The Company will continue to cooperate with the SEC in this investigation. At this time, the Company is unable to estimate any reasonably possible loss, or range of reasonably possible losses, with respect to the matters described above.

Late Filings and NYSE Actions

On April 4, 2014, the Company filed a Current Report on Form 8-K with the SEC announcing that on April 2, 2014 the Company received from NYSE Regulation, Inc. (the “NYSE”) a notice of failure to satisfy a continued listing rule or standard and related monitoring. The notice informed the Company that, as a result of the failure to timely file the 2013 Form 10-K, the Company is subject to the procedures specified in Section 802.01E (SEC Annual Report Timely Filing Criteria) of the NYSE Listed Company Manual (“Section 802.01E”). Under the Section 802.01E procedures, the NYSE will monitor the status of the filing of the 2013 Form 10-K and related public disclosures for up to a six-month period from its due date. If the Company did not file the 2013 Form 10-K within six months from the filing due date, the NYSE may, in its sole discretion, allow the Company’s common stock to trade for up to an additional six months pending the filing of the 2013 Form 10-K prior to commencing suspension or delisting procedures, depending on the Company’s specific circumstances.

On September 5, 2014, the Company made a request to the NYSE that its shares are permitted to continue to trade on the NYSE while the Company completed its restatement of the consolidated financial statements. On October 3, 2014, the Company received an extension for continued listing and trading of the Company’s common stock on the NYSE. The extension, subject to ongoing reassessment by the NYSE, provided the Company with an additional trading period until April 1, 2015, during which the Company can file its 2013 Form 10-K with the SEC. On February 12, 2015, the Company filed its 2013 Form 10-K, and simultaneously filed its Form 10-Q for each of the quarters ended March 31, 2014, June 30, 2014 and September 30, 2014. The Company believes that these filings with the SEC satisfy the NYSE continued listing requirements.

2021 Notes indenture reporting covenant default

As disclosed in the Company’s Form 8-K filed on June 25, 2014, the Company received a notice of default on June 20, 2014 (the “10-K and Q1 10-Q Notice of Default”) from the Trustee under the Indenture. The 10-K and Q1 10-Q Notice of Default related to the failure by the Company, pursuant to Section 4.03 of the Indenture, to file with the SEC its Annual Report on Form 10-K for the fiscal year ended December 31, 2013 and its Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2014 (the “Initial Reporting Defaults”). The Company did not cure the Initial Reporting Defaults within the applicable 60-day grace period and the Initial Reporting Defaults ripened into Events of Default. The Company elected, as the sole and exclusive remedy for the Events of Default, to pay additional interest on the Notes at a rate equal to 0.25% per annum of the principal amount of the Notes (the “Additional Interest”) for a period of 180 days following the occurrence of the Events of Default (the “Additional Interest Period”).

On August 20, 2014, the Company received a notice of default related to its failure to file its Form 10-Q for the fiscal quarter ended June 30, 2014 (the “Q2 10-Q Notice of Default”), and on November 19, 2014, the Company received a notice of default related to its failure to file its Form 10-Q for the fiscal quarter ended September 30, 2014 (the “Q3 10-Q Notice of Default”). These defaults also ripened into Events of Default and on December 29, 2014 and January 15, 2015, respectively, the Company elected to extend the Additional Interest Period for up to 180 days following each additional Event of Default.

Upon the filing with the SEC of this Report and expected filing of the Form 10-Qs for each of the fiscal quarters ended March 31, 2014, June 30, 2014 and September 30, 2014, the Company believes it will regain compliance with its reporting obligations under the Indenture, cure all identified covenant defaults in each of the 10-K and Q1 10-Q Notice of Default, the Q2 10-Q Notice of Default, and the Q3 10-Q Notice of Default, and cease accruing the Additional Interest on the Notes as of the filing date of 10-Q for the fiscal quarter ended September 30, 2014.

Early termination of derivative contracts

On September 1, 2014, the Company and the counterparty, the Goldman Sachs International bank (“GS”), mutually agreed to terminate a zero cost collar contract under termination provisions of the International Swaps and Derivatives Association (“ISDA”) agreement. In connection with this termination, the Company received $1,050 thousand for settlement proceeds from GS.

On September 30, 2014, the Company and the counterparty, the UBS AG, Seoul Branch (“UBS”), mutually agreed to terminate a zero cost collar contract under termination provisions of the ISDA agreement. In connection with this termination, the Company received $430 thousand for settlement proceeds from UBS.

Close of a fabrication facility

On December 4, 2014, the Company approved a plan to close its six-inch fabrication facility in Cheongju, South Korea (the “6-inch fab”). This plan is expected to be substantially implemented over the next 12 months, and the 6-inch fab is expected to be closed by the end of 2015. The Company plans to transfer the 6-inch fab employees to the Company’s other facilities.