Magnachip Semiconductor (MX) 10-Q 5 Jun 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Jun. 01, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	MX
Entity Registrant Name	MAGNACHIP SEMICONDUCTOR Corp
Entity Central Index Key	1325702
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		34,056,468

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets
Cash and cash equivalents	$91,395	$102,434
Accounts receivable, net	71,848	72,957
Inventories, net	76,422	75,334
Other receivables	4,535	10,616
Prepaid expenses	10,311	7,560
Current deferred income tax assets	43	237
Other current assets	7,224	6,898
Total current assets	261,778	276,036
Property, plant and equipment, net	216,486	223,766
Intangible assets, net	2,422	2,451
Long-term prepaid expenses	9,951	10,916
Deferred income tax assets	281	415
Other non-current assets	14,548	14,147
Total assets	505,466	527,731
Current liabilities
Accounts payable	73,812	70,767
Other accounts payable	8,195	10,986
Accrued expenses	74,573	81,060
Other current liabilities	4,616	6,460
Total current liabilities	161,196	169,273
Long-term borrowings, net	224,065	224,035
Accrued severance benefits, net	144,491	139,289
Other non-current liabilities	11,489	13,636
Total liabilities	541,241	546,233
Commitments and Contingencies (Note 16)
Stockholders' equity
Common stock, $0.01 par value, 150,000,000 shares authorized, 40,635,233 shares issued and 34,056,468 outstanding at March 31, 2015 and December 31, 2014	406	406
Additional paid-in capital	118,604	118,419
Accumulated deficit	-31,372	-11,343
Treasury stock, 6,578,765 shares at March 31, 2015 and December 31, 2014	-90,918	-90,918
Accumulated other comprehensive loss	-32,495	-35,066
Total stockholders' equity (deficit)	-35,775	-18,502
Total liabilities and stockholders' equity	$505,466	$527,731

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	40,635,233	40,635,233
Common stock, shares outstanding	34,056,468	34,056,468
Treasury stock, shares	6,578,765	6,578,765

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Net sales	$164,885	$164,164
Cost of sales	129,908	123,887
Gross profit	34,977	40,277
Operating expenses
Selling, general and administrative expenses	25,030	25,027
Research and development expenses	22,160	23,137
Total operating expenses	47,190	48,164
Operating loss	-12,213	-7,887
Interest expense, net	-4,063	-4,070
Foreign currency loss, net	-3,176	-9,406
Other income, net	556	561
Loss before income taxes	-18,896	-20,802
Income tax expenses	1,133	803
Net loss	($20,029)	($21,605)
Loss per common share-
Basic	($0.59)	($0.63)
Diluted	($0.59)	($0.63)
Weighted average number of shares-
Basic	34,056,468	34,052,875
Diluted	34,056,468	34,052,875

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net loss	($20,029)	($21,605)
Other comprehensive income
Foreign currency translation adjustments	3,056	6,619
Derivative adjustments
Fair valuation of derivatives		-1,801
Reclassification adjustment for loss (gain) on derivatives included in net loss	-485	3
Unrealized gain on investments		276
Net current-period other comprehensive income (loss)	2,571	5,097
Total comprehensive loss	($17,458)	($16,508)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated deficit) [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]
In Thousands, except Share data	USD ($)		USD ($)	USD ($)	USD ($)	USD ($)	USD ($)
Balance, beginning at Dec. 31, 2013	$81,541		$406	$116,222	$105,889	($90,918)	($50,058)
Balance, Shares beginning at Dec. 31, 2013		34,048,366
Stock-based compensation	617			617
Exercise of stock options	48			48
Exercise of stock options, Shares		6,795
Exercise of warrants	19			19
Exercise of warrants, Shares		1,202
Other comprehensive income, net	5,097						5,097
Net loss	-21,605				-21,605
Balance, ending at Mar. 31, 2014	65,717		406	116,906	84,284	-90,918	-44,961
Balance, Shares ending at Mar. 31, 2014		34,056,363
Balance, beginning at Dec. 31, 2014	-18,502		406	118,419	-11,343	-90,918	-35,066
Balance, Shares beginning at Dec. 31, 2014	34,056,468	34,056,468
Stock-based compensation	185			185
Other comprehensive income, net	2,571						2,571
Net loss	-20,029				-20,029
Balance, ending at Mar. 31, 2015	($35,775)		$406	$118,604	($31,372)	($90,918)	($32,495)
Balance, Shares ending at Mar. 31, 2015	34,056,468	34,056,468

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net loss	($20,029)	($21,605)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	6,870	7,268
Provision for severance benefits	7,260	4,034
Bad debt expenses (reversal of allowance)	-20	94
Amortization of debt issuance costs and original issue discount	162	149
Loss on foreign currency, net	4,179	11,007
Stock-based compensation	185	617
Other	-222	367
Changes in operating assets and liabilities
Accounts receivable	133	-28,094
Inventories, net	-1,701	-10,028
Other receivables	6,140	691
Other current assets	-1,653	-806
Deferred tax assets	324	366
Accounts payable	5,902	-837
Other accounts payable	-4,881	-1,230
Accrued expenses	-7,626	-3,273
Other current liabilities	-1,774	-1,790
Other non-current liabilities	-220	548
Payment of severance benefits	-1,341	-1,514
Other	-367	-150
Net cash used in operating activities	-8,679	-44,186
Cash flows from investing activities
Purchase of plant, property and equipment	-557	-6,259
Payment for intellectual property registration	-77	-92
Payment of guarantee deposits	-411	-289
Other	15	7
Net cash used in investing activities	-1,030	-6,633
Cash flows from financing activities
Proceeds from issuance of common stock		67
Net cash provided by financing activities		67
Effect of exchange rates on cash and cash equivalents	-1,330	1,914
Net decrease in cash and cash equivalents	-11,039	-48,838
Cash and cash equivalents
Beginning of the period	102,434	153,606
End of the period	91,395	104,768
Supplemental cash flow information
Cash paid for interest	7,683	7,340
Cash paid (refunded) for income taxes	303	-21
Non-cash investing activities
Property, plant and equipment additions in other accounts payable	$785	$1,271

Business_Basis_of_Presentation

Business, Basis of Presentation and Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Business, Basis of Presentation and Significant Accounting Policies	1. Business, Basis of Presentation and Significant Accounting Policies
	Business
	MagnaChip Semiconductor Corporation (together with its subsidiaries, the “Company”) is a Korea-based designer and manufacturer of analog and mixed-signal semiconductor products for consumer, computing, communication, industrial, automotive and Internet of Things (“IoT”) applications. The Company provides technology platforms for analog, mixed signal, power, high voltage, non-volatile memory and RF applications. The Company’s business is comprised of three key business lines: Display Solutions, Power Solutions and Semiconductor Manufacturing Services. The Company’s Display Solutions products provide flat panel display solutions to major suppliers of large and small flat panel display. The Company’s Power Solutions products include discrete and integrated circuit solutions for power management in consumer, communication and industrial applications. The Company’s Semiconductor Manufacturing Services provide specialty analog and mixed-signal foundry services mainly for fabless and Integrated Device Manufacturer (“IDM”) semiconductor companies that primarily serve the consumer, computing, communication, industrial, automotive and IoT applications.
	Basis of Presentation
	The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America (“US GAAP”). These interim consolidated financial statements include normal recurring adjustments and the elimination of all intercompany accounts and transactions which are, in the opinion of management, necessary to provide a fair statement of the Company’s financial condition and results of operations for the periods presented. These interim consolidated financial statements are presented in accordance with ASC 270, “Interim Reporting” (“ASC 270”) and, accordingly, do not include all of the information and note disclosures required by US GAAP for complete financial statements. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results to be expected for a full year or for any other periods.
	The December 31, 2014 balance sheet data was derived from the Company’s audited financial statements, but does not include all disclosures required by US GAAP.
	Recent Accounting Pronouncements
	In April 2015, the FASB issued Accounting Standards Update. 2015-03, “Interest—Imputation of Interest” (“ASU 2015-03”). ASU 2015-03 requires that debt issuance costs are presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs would not be affected. ASU 2015-03 is effective for annual reporting periods beginning after December 15, 2015, including interim periods within that reporting period. The Company is currently evaluating the impact of the adoption of ASU 2015-03 on its consolidated financial statements.
	In August 2014, the FASB issued Accounting Standards Update No. 2014-15, “Presentation of Financial Statements — Going Concern” (“ASU 2014-15”), which provides guidance on determining when and how to disclose going-concern uncertainties in the financial statements. ASU 2014-15 requires management to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date the financial statements are issued. An entity will be required to provide certain disclosures if conditions of events raise substantial doubt about the entity’s ability to continue as a going concern. ASU 2014-15 is effective for annual periods ending after December 15, 2016, and interim periods thereafter, with early adoption permitted. The Company is currently evaluating the impact of the adoption of ASU 2014-15 on its consolidated financial statements.
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”). ASU 2014-09 supersedes the revenue recognition requirements in “Revenue Recognition (Topic 605)”, and requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is not permitted. The Company is currently evaluating the impact of the adoption of ASU 2014-09 on its consolidated financial statements.

Sales_of_Accounts_Receivable_a

Sales of Accounts Receivable and Receivable Discount Program	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Sales of Accounts Receivable and Receivable Discount Program	2. Sales of Accounts Receivable and Receivable Discount Program
	The Company has entered into an agreement to sell selected trade accounts receivable to a financial institution from time to time since March 2012. After the sale, the Company does not retain any interest in the receivables and the applicable financial institution collects these accounts receivable directly from the customer. The proceeds from the sales of these accounts receivable totaled $25,485 thousand and $3,139 thousand for the three months ended March 31, 2015 and 2014, respectively, and these sales resulted in pre-tax losses of $22 thousand and $8 thousand for the three months ended March 31, 2015 and 2014, respectively, which are included in selling, general and administrative expenses in the consolidated statements of operations. Net proceeds of this accounts receivable sale program are recognized in the consolidated statements of cash flows as part of operating cash flows.
	The Company uses receivable discount programs with certain customers. While these discount arrangements allow the Company to accelerate collection of customers’ receivables, there can be no assurance that these programs will continue in the future.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventories	3. Inventories
	Inventories as of March 31, 2015 and December 31, 2014 consist of the following:
		March 31,			December 31,
		2015			2014
	Finished goods	$	33,372		$	40,404
	Semi-finished goods and work-in-process		75,083			68,153
	Raw materials		8,119			7,520
	Materials in-transit and other		1,666			6,745
	Less: inventory reserve		(41,818	)		(47,488	)
	Inventories, net	$	76,422		$	75,334
		Three Months Ended
		March 31,			March 31,
		2015			2014
	Beginning balance	$	(47,488	)	$	(72,400	)
	Change in reserve		(896	)		(2,788	)
	Write off		6,338			4,012
	Translation adjustments		228			911
	Ending balance	$	(41,818	)	$	(70,265	)
	Inventory reserve represents the Company’s best estimate in value lost due to excessive inventory level, physical deterioration, obsolescence, changes in price levels, or other causes based on individual facts and circumstances. Inventory reserve relates to inventory items including finished goods, semi-finished goods and work-in-process. Write off of this reserve is recognized only when the related inventory has been disposed or scrapped.

Property_Plant_and_Equipment

Property, Plant and Equipment	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	4. Property, Plant and Equipment
	Property, plant and equipment as of March 31, 2015 and December 31, 2014 comprise the following:
		March 31,			December 31,
		2015			2014
	Buildings and related structures	$	70,662		$	70,552
	Machinery and equipment		267,733			269,031
	Vehicles and others		24,719			24,812
			363,114			364,395
	Less: accumulated depreciation		(163,253	)		(157,341	)
	Land		16,625			16,712
	Property, plant and equipment, net	$	216,486		$	223,766
	Aggregate depreciation expenses totaled $6,789 thousand and $6,850 thousand for the three months ended March 31, 2015 and 2014, respectively.

Intangible_Assets

Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	5. Intangible Assets
	Intangible assets as of March 31, 2015 and December 31, 2014 are as follows:
		March 31,			December 31,
		2015			2014
	Technology	$	19,580		$	19,683
	Customer relationships		28,120			28,269
	Intellectual property assets		8,350			8,359
	Less: accumulated amortization		(53,628	)		(53,860	)
	Intangible assets, net	$	2,422		$	2,451
	Aggregate amortization expenses for intangible assets totaled $81 thousand and $418 thousand for the three months ended March 31, 2015 and 2014, respectively.

Accrued_Expenses

Accrued Expenses	3 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Accrued Expenses	6. Accrued Expenses
	Accrued expenses as of March 31, 2015 and December 31, 2014 are as follows:
		March 31,		December 31,
		2015		2014
	Payroll, benefits and related taxes, excluding severance benefits	$	20,888	$	18,654
	Withholding tax levied on intercompany interest income		28,329		27,497
	Interest on senior notes		3,148		7,040
	Settlement obligations		7,264		8,976
	Outside service fees		7,064		10,640
	Others		7,880		8,253
	Accrued expenses	$	74,573	$	81,060
	Settlement obligations included in the table above relate to claims involving the Company’s products that may have caused a failure in the customer’s product. Although the Company does not agree with the claim, as its product met the customer’s specifications, the Company considered a number of factors and decided not to dispute the claim but make certain in-kind payments as demanded by the customer. These settlement obligations are accrued when they are deemed probable and can be reasonably estimated.

Derivative_Financial_Instrumen

Derivative Financial Instruments

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

7. Derivative Financial Instruments

The Company’s Korean subsidiary from time to time has entered into zero cost collar contracts to hedge the risk of changes in the functional-currency-equivalent cash flows attributable to currency rate changes on U.S. dollar denominated revenues.

The Company did not have any derivative contracts in effect as of March 31, 2015 and December 31, 2014.

The zero cost collar contracts qualify as cash flow hedges under ASC 815, “Derivatives and Hedging,” (“ASC 815”), since at both the inception of the contracts and on an ongoing basis, the hedging relationship was and is expected to be highly effective in achieving offsetting cash flows attributable to the hedged risk during the term of the contracts. The Company is utilizing the “hypothetical derivative” method to measure the effectiveness by comparing the changes in value of the actual derivative versus the change in fair value of the “hypothetical derivative.”

For derivative instruments that are designated and qualify as cash flow hedges, the effective portion of the gain or loss on the derivative is reported as a component of accumulated other comprehensive income (“AOCI”) and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative, representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness, are recognized in current earnings.

The following table summarizes the impact of derivative instruments on the consolidated statement of operations for the three months ended March 31, 2015 and 2014:

Derivatives in ASC

Amount of Loss

Location of

Amount of Gain (Loss)

Location of Loss

Amount of Loss

815 Cash Flow Hedging

Recognized in

Gain (Loss)

Reclassified from AOCI into

Recognized in

Recognized in

Relationships

AOCI on

Reclassified from

Statement of

Statement of

Statement of

Derivatives

AOCI into

Operations

Operations on

Operations on Derivatives

(Effective Portion)

Statement of

(Effective Portion)

Derivative

(Ineffective Portion

Operations

(Ineffective

and Amount

(Effective Portion)

Portion and

Excluded from

Amount

Effectiveness Testing)

Excluded  from

Effectiveness

Testing)

Three Months Ended

Three Months Ended

Three Months Ended

March 31,

March 31,

March 31,

2015

2014

2015

2014

2015

2014

Zero cost collars

$

—

$

(1,801

)

Net sales

$

485

$

(3

)

Other income,

$

—

$

(16

)

net

Total

$

—

$

(1,801

)

$

485

$

(3

)

$

—

$

(16

)

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	8. Fair Value Measurements
	The Company did not have any assets measured at fair value on a recurring basis as of March 31, 2015 other than cash and cash equivalents, restricted cash, accounts receivable, other receivables, accounts payable, and other accounts payable, fair value of which approximate carrying values due to the short-term nature of these instruments. The fair value of assets and liabilities whose carrying value approximates fair value is determined using Level 2 inputs, with the exception of cash (Level 1).
	As of March 31, 2015, the total carrying value and estimated fair value of the Company’s 6.625% Senior Notes due 2021 (the “2021 Notes”), which are not measured at fair value on a recurring basis, were $224,065 thousand and $157,500 thousand, respectively. The decrease in the fair value of the 2021 Notes was related to the deterioration of the Company’s credit rating in the first quarter of 2015. The estimated fair value is based on Level 2 inputs.

LongTerm_Borrowings

Long-Term Borrowings	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-Term Borrowings	9. Long-Term Borrowings
	Long-term borrowings as of March 31, 2015 and December 31, 2014 are as follows:
		March 31,			December 31,
		2015			2014
	6.625% senior notes due July 2021	$	225,000		$	225,000
	Discount on senior notes		(935	)		(965	)
	Long-term borrowings, net of unamortized discount	$	224,065		$	224,035
	On July 18, 2013, the Company issued $225,000,000 aggregate principal amount of the 2021 Notes at a price of 99.5%. Interest on the 2021 Notes accrues at a rate of 6.625% per annum, payable semi-annually on January 15 and July 15 of each year, beginning on January 15, 2014.
	In connection with the issuance of the 2021 Notes, the Company capitalized certain costs and fees, which are being amortized using the effective interest method over its respective term, 2013 to 2021. Amortization costs, which were included in interest expense in the accompanying statements of operations, amounted to $132 thousand for the three months ended March 31, 2015. The remaining capitalized costs as of March 31, 2015, which were included in other non-current assets in the consolidated balance sheet, were $4,188 thousand.
	The Company used net proceeds from the issuance of the 2021 Notes of $218.8 million, which represents $225.0 million of principal amount net of $1.1 million of original issue discount and $5.1 million of debt issuance costs, together with cash on hand, to repay all of the Company’s 10.500% senior notes due April 2018, including applicable premium and accrued interest, and to pay related fees and expenses of the 2021 Notes offering.
	In connection with the refinancing of the Company’s senior notes, the Company recognized $32.8 million of loss on early extinguishment of senior notes, which consisted of $23.8 million from the applicable premium, $5.3 million from write-off of debt issuance costs, $1.9 million from write-off of discounts and $1.8 million of interest incurred during the notice period.
	The Company can optionally redeem all or a part of the 2021 Notes according to the following schedule: (i) at any time prior to July 15, 2016, the Company may on any one or more occasions redeem up to 35% of the aggregate principal amount of 2021 Notes issued under that certain Indenture, dated as of July 18, 2013, by and between the Company and Wilmington Trust, National Association, as trustee (the “Trustee”), as supplemented by that certain First Supplemental Indenture, dated as of March 27, 2014 (collectively, the “Indenture”) at a redemption price equal to 106.625% of the principal amount of the 2021 Notes redeemed, plus accrued and unpaid interest and special interest, if any, to the date of redemption with the net proceeds of a qualified equity offering; (ii) at any time prior to July 15, 2017, the Company may on any one or more occasions redeem all or a part of the 2021 Notes at a redemption price equal to 100% of the principal amount of the notes redeemed, plus the applicable premium as of, and accrued and unpaid interest and special interest, if any, to the date of redemption; and (iii) on or after July 15, 2017, the Company may on any one or more occasions redeem all or a part of the 2021 Notes, at a redemption price equal to 103.313%, 101.656% and 100% of the principal amount of the notes redeemed in 2017, 2018 and 2019 and thereafter, respectively, plus accrued and unpaid interest and special interest, if any, on the notes redeemed, to the applicable date of redemption.
	The Indenture contains covenants that limit ability of the Company and its restricted subsidiaries to: (i) declare or pay any dividend or make any payment or distribution on account of or purchase or redeem the Company’s capital stock or equity interests of the restricted subsidiaries; (ii) make any principal payment on, or redeem or repurchase, prior to any scheduled repayment or maturity, any subordinated indebtedness; (iii) make certain investments; (iv) incur additional indebtedness and issue certain types of capital stock; (v) create or incur any lien (except for permitted liens) that secures obligations under any indebtedness; (vi) merge with or into or sell all or substantially all of the Company’s assets to other companies; (vii) enter into certain types of transactions with affiliates; (viii) guarantee the payment of any indebtedness; (ix) enter into sale-leaseback transactions; (x) enter into agreements that would restrict the ability of the restricted subsidiaries to make distributions with respect to their equity to the Company or other restricted subsidiaries, to make loans to the Company or other restricted subsidiaries or to transfer assets to the Company or other restricted subsidiaries; and (xi) designate unrestricted subsidiaries.
	These covenants are subject to a number of exceptions and qualifications. Certain of these restrictive covenants will terminate if the notes are rated investment grade at any time.
	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 2021 Notes at a rate equal to 0.25% per annum of the principal amount of the 2021 Notes (the “Additional Interest”) for a period of up to 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 the 2013 Form 10-K and the Form 10-Qs for each of the fiscal quarters ended March 31, 2014, June 30, 2014 and September 31, 2014, the Company regained compliance with its reporting obligations under the Indenture and cured all identified covenant defaults in each of the 10-K and the Q1 10-Q Notice of Default, the Q2 10-Q Notice of Default, and the Q3 10-Q Notice of Default, and ceased accruing the Additional Interest on the 2021 Notes as of February 12, 2015.

Accrued_Severance_Benefits

Accrued Severance Benefits	3 Months Ended
	Mar. 31, 2015
Postemployment Benefits [Abstract]
Accrued Severance Benefits	10. Accrued Severance Benefits
	The majority of accrued severance benefits is for employees in the Company’s Korean subsidiary, MagnaChip Semiconductor, Ltd. Pursuant to the Employee Retirement Benefit Security Act of Korea, eligible employees and executive officers with one or more years of service are entitled to severance benefits upon the termination of their employment based on their length of service and rate of pay. As of March 31, 2015, 98% of employees of the Company were eligible for severance benefits.
	Changes in accrued severance benefits are as follows:
		Three Months Ended
		March 31,			March 31,
		2015			2014
	Beginning balance	$	140,405		$	135,356
	Provisions		7,260			4,034
	Severance payments		(1,341	)		(1,514	)
	Translation adjustments		(726	)		(1,700	)
			145,598			136,176
	Less: Cumulative contributions to the National Pension Fund		(343	)		(375	)
	Group severance insurance plan		(764	)		(788	)
	Accrued severance benefits, net	$	144,491		$	135,013
	The severance benefits funded through the Company’s National Pension Fund and group severance insurance plan will be used exclusively for payment of severance benefits to eligible employees. These amounts have been deducted from the accrued severance benefit balance.
	The Company is liable to pay the following future benefits to its non-executive employees upon their normal retirement age:
		Severance benefit
	Remainder of 2015	$	295
	2016		1,166
	2017		1,713
	2018		2,903
	2019		2,278
	2020		3,121
	2021 – 2025		31,155
	The above amounts were determined based on the non-executive employees’ current salary rates and the number of service years that will be accumulated upon their retirement dates. These amounts do not include amounts that might be paid to non-executive employees that will cease working with the Company before their normal retirement ages.

Foreign_Currency_Gain_Loss_Net

Foreign Currency Gain (Loss), Net	3 Months Ended
	Mar. 31, 2015
Foreign Currency [Abstract]
Foreign Currency Gain (Loss), Net	11. Foreign Currency Gain (Loss), Net
	Net foreign currency gain or loss includes non-cash translation gain or loss associated with intercompany balances. A substantial portion of the Company’s net foreign currency gain or loss is non-cash translation gain or loss associated with intercompany long-term loans to the Company’s Korean subsidiary. The loans are denominated in U.S. dollars and are affected by changes in the exchange rate between the Korean won and the U.S. dollar. As of March 31, 2015, the outstanding intercompany loan balance including accrued interests between the Korean subsidiary and the Dutch subsidiary was $762 million. The Korean won to U.S. dollar exchange rates were 1,105.0:1 and 1,099.2:1 using the first base rate as of March 31, 2015 and December 31, 2014, respectively, as quoted by the Korea Exchange Bank.

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes
	The Company files income tax returns in the U.S., Korea, Japan, Taiwan and various other jurisdictions.
	The Company’s Korean subsidiary, MagnaChip Semiconductor, Ltd., is the principal operating entity within the consolidated Company. For the three months ended March 31, 2015 and 2014, no income tax expense for MagnaChip Semiconductor, Ltd. was recorded due to net operating loss carry-forwards available to offset taxable income and full allowance for deferred tax assets.
	Income tax expense recorded for the three months ended March 31, 2015 and 2014 was $1,133 thousand and $803 thousand, respectively, primarily attributable to withholding taxes related to intercompany balances.

Geographic_and_Segment_Informa

Geographic and Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Geographic and Segment Information	13. Geographic and Segment Information
	As of March 31, 2015, the Company has one operating segment consisting of three business lines: Display Solutions, Power Solutions and Semiconductor Manufacturing Services. The Company’s chief operating decision maker is considered to be its Chief Executive Officer. The chief operating decision maker allocates resources and assesses performance of the business and other activities at the operating segment level.
	The following is a summary of net sales by business line:
		Three Months Ended
		March 31,		March 31,
		2015		2014
	Net Sales
	Display Solutions	$	56,353	$	40,379
	Semiconductor Manufacturing Services		74,520		91,928
	Power Solutions		33,837		31,775
	All other		175		82
	Total net sales	$	164,885	$	164,164
	The following is a summary of net sales by region, based on the location of the customer:
		Three Months Ended
		March 31,		March 31,
		2015		2014
	Korea	$	62,470	$	67,013
	Asia Pacific (other than Korea)		79,177		70,221
	U.S.A.		19,370		19,753
	Europe		3,653		6,893
	Others		215		284
	Total	$	164,885	$	164,164
	Net sales from the Company’s top ten largest customers accounted for 67% and 55% for the three months ended March 31, 2015 and 2014, respectively.
	For the three months ended March 31, 2015, the Company had two customers that represented 15.4% and 13.8% of its net sales.
	For the three months ended March 31, 2014, we had no customer which represented over 10% of the Company’s net sales.
	96% of the Company’s property, plant and equipment are located in Korea as of March 31, 2015.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Accumulated Other Comprehensive Loss	14. Accumulated Other Comprehensive Loss
	Accumulated other comprehensive loss consists of the following as of March 31, 2015 and December 31, 2014, respectively:
		March 31,			December 31,
		2015			2014
	Foreign currency translation adjustments	$	(32,495	)	$	(35,551	)
	Derivative adjustments		—			485
	Total	$	(32,495	)	$	(35,066	)
	Changes in accumulated other comprehensive loss for the three months ended March 31, 2015 and 2014 is as follows:
	Three Months Ended March 31, 2015	Foreign			Derivative			Unrealized		Total
		currency			adjustments			gain on
		translation						investments
		adjustments
	Beginning balance	$	(35,551	)	$	485		$	—	$	(35,066	)
	Other comprehensive income before reclassifications		3,056			—			—		3,056
	Amounts reclassified from accumulated other comprehensive loss		—			(485	)		—		(485	)
	Net current-period other comprehensive income (loss)		3,056			(485	)		—		2,571
	Ending balance	$	(32,495	)	$	—		$	—	$	(32,495	)
	Three Months Ended March 31, 2014	Foreign			Derivative			Unrealized		Total
		currency			adjustments			gain on
		translation						investments
		adjustments
	Beginning balance	$	(57,326	)	$	6,587		$	681	$	(50,058	)
	Other comprehensive income (loss) before reclassifications		6,619			(1,801	)		276		5,094
	Amounts reclassified from accumulated other comprehensive income		—			3			—		3
	Net current-period other comprehensive income (loss)		6,619			(1,798	)		276		5,097
	Ending balance	$	(50,707	)	$	(4,789	)	$	957	$	(44,961	)

Loss_per_Share

Loss per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Loss per Share	15. Loss per Share
	The following table illustrates the computation of basic and diluted loss per common share:
		Three Months Ended
		March 31,			March 31,
		2015			2014
	Net loss	$	(20,029	)	$	(21,605	)
	Weighted average common stock outstanding
	Basic		34,056,468			34,052,875
	Diluted		34,056,468			34,052,875
	Loss per share
	Basic	$	(0.59	)	$	(0.63	)
	Diluted	$	(0.59	)	$	(0.63	)
	The following outstanding instruments were excluded from the computation of diluted loss per share, as they have an anti-dilutive effect on the calculation:
		Three Months Ended
		March 31,			March 31,
		2015			2014
	Options		3,068,898			3,180,925
	Warrants		—			1,425,129
	Rights Plan
	On March 5, 2015, the Board of Directors of the Company, authorized and declared a dividend of one preferred stock purchase right (a “Right” and collectively, the “Rights”) for each share of the Company’s common stock, par value $0.01 per share, outstanding at the close of business on March 16, 2015. Each Right, once exercisable, will entitle the registered holder to purchase from the Company one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $0.01 per share, at a purchase price of $24, subject to adjustment (the “Purchase Price”). The Rights are not presently exercisable and remain attached to the shares of common stock unless and until the occurrence of the earlier of the following (the “Distribution Date”): (i) the tenth day after the public announcement or disclosure by the Company or any person or group of affiliated or associated persons that any person or group of affiliated or associated persons has become an “Acquiring Person” by obtaining beneficial ownership of 10% (or 20% in the case of a “passive institutional investor,” which is defined generally as any person who has reported beneficial ownership of shares of common stock on Schedule 13G under the Securities Exchange Act of 1934) or more of the Company’s outstanding common stock, subject to certain exceptions; or (ii) the tenth business day (or such later date as the Company’s Board of Directors may designate before a person or group of affiliated or associated persons becomes an Acquiring Person) after the commencement of, or first public announcement of the intent of any person to commence, a tender or exchange offer by any person or group of affiliated or associated persons, which would, if consummated, result in such person or group becoming an Acquiring Person. The Board of Directors may redeem all of the Rights for $0.001 per Right at any time before any person or group of affiliated or associated persons becomes an Acquiring Person. In addition, at any time on or after any person or group of affiliated or associated persons becomes an Acquiring Person (but before any person or group of affiliated or associated persons becomes the owner of 50% or more of the Company’s outstanding common stock), the Board of Directors may exchange all or part of the Rights (other than the Rights beneficially owned by the Acquiring Person and certain affiliated persons) for shares of common stock at an exchange ratio of one share of common stock per Right. The Rights will expire at the close of business on March 5, 2016, unless redeemed or exchanged prior to that time.
	If any person or group of affiliated or associated persons becomes an Acquiring Person, then, after the Distribution Date, each Right (other than Rights beneficially owned by the Acquiring Person and certain affiliated persons or transferees thereof) will entitle the holder to purchase, for the Purchase Price, a number of shares of common stock having a market value of twice the Purchase Price. Alternatively, if, after any person or group of affiliated or associated persons becomes an Acquiring Person, (1) the Company is involved in a merger or other business combination in which the Company is not the surviving corporation or its common stock is changed into or exchanged for other securities or assets; or (2) the Company or one or more of its subsidiaries sell or otherwise transfer assets or earning power aggregating more than 50% of the assets or earning power of the Company and its subsidiaries, taken as a whole, then each Right will entitle the holder to purchase, for the Purchase Price, a number of shares of common stock of the other party to such business combination or sale (or in certain circumstances, an affiliate) having a market value of twice the Purchase Price.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	16. Commitments and Contingencies
	Securities Class Action Complaints
	On March 12, 2014, a purported class action was filed against the Company and certain of the Company’s now-former officers. On March 16, 2015, a second amended complaint in this same action was filed against the Company, certain of the Company’s current directors and former and now-former officers, and a shareholder of the Company on behalf of a putative class consisting of all persons other than the defendants who purchased or acquired the Company’s securities between February 1, 2012 and February 12, 2015. The second amended complaint asserts claims for (i) alleged violations of Section 10(b) of the Exchange Act and Rule 10b-5 promulgated thereunder by the Company and certain of the Company’s current directors and former and now-former officers, (ii) alleged violations of Section 20(a) of the Exchange Act by certain of the Company’s current directors and former and now-former officers, and (iii) alleged violations of Sections 20(a) and 20(A) of the Exchange Act by a shareholder. The action, Thomas et al., v. MagnaChip Semiconductor Corp., et al., No. 3:14-cv-1160, is pending in the Northern District of California.
	On April 21, 2015, a related purported class action lawsuit was filed against the Company, certain of the Company’s current directors and former and now-former officers, a shareholder of the Company, and certain financial firms that acted as underwriters of the Company’s public stock offerings on behalf of a putative class consisting of all persons other than the defendants who purchased or acquired the Company’s securities between February 1, 2012 and February 12, 2015, including all purchasers of the Company’s common stock pursuant to or traceable to a shelf registration statement and prospectus issued in connection with the Company’s February 6, 2013 public stock offering. The complaint asserts claims for (i) alleged violations of Section 11 of the Securities Act by the Company, certain of the Company’s current directors and former and now-former officers, and certain financial firms that acted as underwriters of the Company’s public stock offerings, (ii) alleged violations of Section 12 of the Securities Act by the Company, certain of the Company’s former and now-former officers, a shareholder of the Company, and certain financial firms that acted as
	underwriters of the Company’s public stock offerings, (iii) alleged violations of Section 15 of the Securities Act by the Company, certain of the Company’s former and now-former officers, and a shareholder of the Company, (iv) alleged violations of Section 10(b) of the Exchange Act and Rule 10b-5 promulgated thereunder by the Company and certain of the Company’s former and now-former officers, (v) alleged violations of Section 20(a) of the Exchange Act by the Company, certain of the Company’s former and now-former officers, and a shareholder of the Company. The action, Okla. Police Pension & Retirement Sys. v. MagnaChip Semiconductor Corp., et al., No. 3:15-cv-01797, is pending in the Northern District of California. A motion to consolidate Okla. Police Pension & Retirement Sys. v. MagnaChip Semiconductor Corp., et al., No. 3:15-cv-01797 and Thomas et al., v. MagnaChip Semiconductor Corp., et al., No. 3:14-cv-1160 is also pending. 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 Review
	In March 2014, the Company voluntarily reported to the Securities and Exchange Commission (“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 an independent investigation. Over the course of 2014 and in the first quarter of 2015, 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. On March 12, 2015, the SEC issued a subpoena for documents to the Company in connection with its investigation. The Company has and will continue to fully 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.
	Shareholder Derivative Complaints
	A shareholder derivative action, styled Hemmingson et al. v. Elkins et al., Case No. 1-15-cv-278614, was filed in the Superior Court of the State of California in and for Santa Clara County on March 25, 2015, naming as defendants certain of the Company’s current directors and former and now-former officers, as well as a shareholder of the Company, and naming the Company as a nominal defendant. The complaint in this action asserts claims for (i) alleged breaches of fiduciary duty by certain of the Company’s current directors and former and now-former officers for purportedly knowingly failing to maintain adequate internal controls over its accounting and reporting functions and disseminating to shareholders certain alleged materially false and misleading statements, (ii) alleged breaches of fiduciary duty by certain of the Company’s current directors and a current shareholder of the Company for purported insider trading, and (iii) alleged unjust enrichment by a shareholder of the Company for purported insider trading. On May 13, 2015, the court so ordered a stipulation entered into by certain of the parties, agreeing to stay the litigation until Thomas et al., v. MagnaChip Semiconductor Corp., et al., No. 3:14-cv-1160 and Okla. Police Pension & Retirement Sys. v. MagnaChip Semiconductor Corp., et al., No. 3:15-cv-01797 are resolved, unless the stay is lifted earlier.
	On June 1, 2015, a shareholder derivative action as styled as Bushansky v. Norby, et al., No. 1-15-cv-281289, was filed in the Superior Court of the State of California, Santa Clara County. The complaint names as defendants certain of the Company’s current directors and former officers, and a shareholder of the Company, with the Company being named as a nominal defendant. The complaint asserts claims for (i) alleged breaches of fiduciary duties by certain of the Company’s current directors and former officers for knowingly failing to maintain adequate internal controls over the Company’s accounting and reporting functions and disseminating to shareholders certain alleged materially false and misleading statements; and (ii) alleged aiding and abetting of such breaches of fiduciary duties by all defendants. 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.
	In addition, by letter dated May 28, 2015, a purported shareholder demanded to inspect certain of the Company’s books and records, pursuant to Section 220 of the General Corporation Law of the State of Delaware (8 Del. C. § 220). The demand’s stated purpose is to investigate alleged breaches of fiduciary duty by certain of the Company’s current and former directors, officers, and senior management and otherwise evaluate whether to initiate a derivative action on the Company’s behalf.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	17. Subsequent Events
	Late Filings
	On May 12, 2015, the Company filed a Notification of Late Filing on Form 12b-25 with the SEC disclosing that the Company would be unable to timely file its Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 with the SEC.
	NYSE Action
	On April 6, 2015, the Company filed a Current Report on Form 8-K with the SEC announcing that on April 1, 2015 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 its Annual Report on Form 10-K for the fiscal year ended December 31, 2014 (the “2014 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 2014 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 2014 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 2014 Form 10-K prior to commencing suspension or delisting procedures, depending on the Company’s specific circumstances. On May 28, 2015, the Company filed the 2014 Form 10-K. The Company believes that this filing with the SEC satisfies the NYSE continued listing requirements.
	2021 Notes indenture reporting covenant default
	As disclosed in the Company’s Form 8-K filed on May 4, 2015, the Company received a notice of default on May 1, 2015 (the “10-K Notice of Default”) from the Trustee under the Indenture. The 10-K 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, 2014. The Company believes it has cured the default referenced in the 10-K Notice of Default within the applicable 60-day grace period under the Indenture by the filing of the 2014 10-K with the SEC on May 28, 2015.
	Derivative contract
	In May 2015, the Company and the counterparty, the Nomura Financial Investment (Korea) Co., Ltd., entered into derivative contracts of zero cost collars for the third and fourth quarters of the year ending December 31, 2015. The total notional amounts are $84 million. These derivative contracts were executed under the International Swaps and Derivatives Association (“ISDA”) agreement amended in the second quarter of the year 2015 with respect to deletion of the ratings decline provision. In connection with the contracts, the Company paid $5.0 million cash deposits to the counterparty in May 2015.
	Reorganization
	On May 28, 2015, organizational changes were announced about the Company’s plans to, effective immediately, (i) realign its businesses and organizational structure and (ii) streamline and consolidate certain business processes to achieve greater operating efficiencies. In furtherance of these objectives, the Company will manage its business and report its financial results in two operating segments: Semiconductor Manufacturing Services and Standard Products Group. These segments will be established based on how the Company’s business units will be managed prospectively and will have no effect on the Company’s historical consolidated results of operations.

Business_Basis_of_Presentation1

Business, Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Business	Business
	MagnaChip Semiconductor Corporation (together with its subsidiaries, the “Company”) is a Korea-based designer and manufacturer of analog and mixed-signal semiconductor products for consumer, computing, communication, industrial, automotive and Internet of Things (“IoT”) applications. The Company provides technology platforms for analog, mixed signal, power, high voltage, non-volatile memory and RF applications. The Company’s business is comprised of three key business lines: Display Solutions, Power Solutions and Semiconductor Manufacturing Services. The Company’s Display Solutions products provide flat panel display solutions to major suppliers of large and small flat panel display. The Company’s Power Solutions products include discrete and integrated circuit solutions for power management in consumer, communication and industrial applications. The Company’s Semiconductor Manufacturing Services provide specialty analog and mixed-signal foundry services mainly for fabless and Integrated Device Manufacturer (“IDM”) semiconductor companies that primarily serve the consumer, computing, communication, industrial, automotive and IoT applications.
Basis of Presentation	Basis of Presentation
	The accompanying unaudited interim consolidated financial statements of the Company have been prepared in accordance with generally accepted accounting principles in the United States of America (“US GAAP”). These interim consolidated financial statements include normal recurring adjustments and the elimination of all intercompany accounts and transactions which are, in the opinion of management, necessary to provide a fair statement of the Company’s financial condition and results of operations for the periods presented. These interim consolidated financial statements are presented in accordance with ASC 270, “Interim Reporting” (“ASC 270”) and, accordingly, do not include all of the information and note disclosures required by US GAAP for complete financial statements. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results to be expected for a full year or for any other periods.
	The December 31, 2014 balance sheet data was derived from the Company’s audited financial statements, but does not include all disclosures required by US GAAP.
Recent Accounting Pronouncements	Recent Accounting Pronouncements
	In April 2015, the FASB issued Accounting Standards Update. 2015-03, “Interest—Imputation of Interest” (“ASU 2015-03”). ASU 2015-03 requires that debt issuance costs are presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs would not be affected. ASU 2015-03 is effective for annual reporting periods beginning after December 15, 2015, including interim periods within that reporting period. The Company is currently evaluating the impact of the adoption of ASU 2015-03 on its consolidated financial statements.
	In August 2014, the FASB issued Accounting Standards Update No. 2014-15, “Presentation of Financial Statements — Going Concern” (“ASU 2014-15”), which provides guidance on determining when and how to disclose going-concern uncertainties in the financial statements. ASU 2014-15 requires management to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date the financial statements are issued. An entity will be required to provide certain disclosures if conditions of events raise substantial doubt about the entity’s ability to continue as a going concern. ASU 2014-15 is effective for annual periods ending after December 15, 2016, and interim periods thereafter, with early adoption permitted. The Company is currently evaluating the impact of the adoption of ASU 2014-15 on its consolidated financial statements.
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”). ASU 2014-09 supersedes the revenue recognition requirements in “Revenue Recognition (Topic 605)”, and requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early adoption is not permitted. The Company is currently evaluating the impact of the adoption of ASU 2014-09 on its consolidated financial statements.

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories as of March 31, 2015 and December 31, 2014 consist of the following:
		March 31,			December 31,
		2015			2014
	Finished goods	$	33,372		$	40,404
	Semi-finished goods and work-in-process		75,083			68,153
	Raw materials		8,119			7,520
	Materials in-transit and other		1,666			6,745
	Less: inventory reserve		(41,818	)		(47,488	)
	Inventories, net	$	76,422		$	75,334
Changes in Inventory Reserve
		Three Months Ended
		March 31,			March 31,
		2015			2014
	Beginning balance	$	(47,488	)	$	(72,400	)
	Change in reserve		(896	)		(2,788	)
	Write off		6,338			4,012
	Translation adjustments		228			911
	Ending balance	$	(41,818	)	$	(70,265	)

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment	Property, plant and equipment as of March 31, 2015 and December 31, 2014 comprise the following:
		March 31,			December 31,
		2015			2014
	Buildings and related structures	$	70,662		$	70,552
	Machinery and equipment		267,733			269,031
	Vehicles and others		24,719			24,812
			363,114			364,395
	Less: accumulated depreciation		(163,253	)		(157,341	)
	Land		16,625			16,712
	Property, plant and equipment, net	$	216,486		$	223,766

Intangible_Assets_Tables

Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	Intangible assets as of March 31, 2015 and December 31, 2014 are as follows:
		March 31,			December 31,
		2015			2014
	Technology	$	19,580		$	19,683
	Customer relationships		28,120			28,269
	Intellectual property assets		8,350			8,359
	Less: accumulated amortization		(53,628	)		(53,860	)
	Intangible assets, net	$	2,422		$	2,451

Accrued_Expenses_Tables

Accrued Expenses (Tables)	3 Months Ended
	Mar. 31, 2015
Payables and Accruals [Abstract]
Summary of Accrued Expenses	Accrued expenses as of March 31, 2015 and December 31, 2014 are as follows:
		March 31,		December 31,
		2015		2014
	Payroll, benefits and related taxes, excluding severance benefits	$	20,888	$	18,654
	Withholding tax levied on intercompany interest income		28,329		27,497
	Interest on senior notes		3,148		7,040
	Settlement obligations		7,264		8,976
	Outside service fees		7,064		10,640
	Others		7,880		8,253
	Accrued expenses	$	74,573	$	81,060

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Impact of Derivative Instruments on Consolidated Statement of Operations

The following table summarizes the impact of derivative instruments on the consolidated statement of operations for the three months ended March 31, 2015 and 2014:

Derivatives in ASC

Amount of Loss

Location of

Amount of Gain (Loss)

Location of Loss

Amount of Loss

815 Cash Flow Hedging

Recognized in

Gain (Loss)

Reclassified from AOCI into

Recognized in

Recognized in

Relationships

AOCI on

Reclassified from

Statement of

Statement of

Statement of

Derivatives

AOCI into

Operations

Operations on

Operations on Derivatives

(Effective Portion)

Statement of

(Effective Portion)

Derivative

(Ineffective Portion

Operations

(Ineffective

and Amount

(Effective Portion)

Portion and

Excluded from

Amount

Effectiveness Testing)

Excluded  from

Effectiveness

Testing)

Three Months Ended

Three Months Ended

Three Months Ended

March 31,

March 31,

March 31,

2015

2014

2015

2014

2015

2014

Zero cost collars

$

—

$

(1,801

)

Net sales

$

485

$

(3

)

Other income,

$

—

$

(16

)

net

Total

$

—

$

(1,801

)

$

485

$

(3

)

$

—

$

(16

)

LongTerm_Borrowings_Tables

Long-Term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Components of Long-Term Borrowings	Long-term borrowings as of March 31, 2015 and December 31, 2014 are as follows:
		March 31,			December 31,
		2015			2014
	6.625% senior notes due July 2021	$	225,000		$	225,000
	Discount on senior notes		(935	)		(965	)
	Long-term borrowings, net of unamortized discount	$	224,065		$	224,035

Accrued_Severance_Benefits_Tab

Accrued Severance Benefits (Tables)	3 Months Ended
	Mar. 31, 2015
Postemployment Benefits [Abstract]
Changes in Accrued Severance Benefits	Changes in accrued severance benefits are as follows:
		Three Months Ended
		March 31,			March 31,
		2015			2014
	Beginning balance	$	140,405		$	135,356
	Provisions		7,260			4,034
	Severance payments		(1,341	)		(1,514	)
	Translation adjustments		(726	)		(1,700	)
			145,598			136,176
	Less: Cumulative contributions to the National Pension Fund		(343	)		(375	)
	Group severance insurance plan		(764	)		(788	)
	Accrued severance benefits, net	$	144,491		$	135,013
Future Benefits Payments to Employees	The Company is liable to pay the following future benefits to its non-executive employees upon their normal retirement age:
		Severance benefit
	Remainder of 2015	$	295
	2016		1,166
	2017		1,713
	2018		2,903
	2019		2,278
	2020		3,121
	2021 – 2025		31,155

Geographic_and_Segment_Informa1

Geographic and Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Net Sales by Business Line	The following is a summary of net sales by business line:
		Three Months Ended
		March 31,		March 31,
		2015		2014
	Net Sales
	Display Solutions	$	56,353	$	40,379
	Semiconductor Manufacturing Services		74,520		91,928
	Power Solutions		33,837		31,775
	All other		175		82
	Total net sales	$	164,885	$	164,164
Net Sales by Region, Based on Location of Customer	The following is a summary of net sales by region, based on the location of the customer:
		Three Months Ended
		March 31,		March 31,
		2015		2014
	Korea	$	62,470	$	67,013
	Asia Pacific (other than Korea)		79,177		70,221
	U.S.A.		19,370		19,753
	Europe		3,653		6,893
	Others		215		284
	Total	$	164,885	$	164,164

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss	Accumulated other comprehensive loss consists of the following as of March 31, 2015 and December 31, 2014, respectively:
		March 31,			December 31,
		2015			2014
	Foreign currency translation adjustments	$	(32,495	)	$	(35,551	)
	Derivative adjustments		—			485
	Total	$	(32,495	)	$	(35,066	)
Changes in Accumulated Other Comprehensive Loss	Changes in accumulated other comprehensive loss for the three months ended March 31, 2015 and 2014 is as follows:
	Three Months Ended March 31, 2015	Foreign			Derivative			Unrealized		Total
		currency			adjustments			gain on
		translation						investments
		adjustments
	Beginning balance	$	(35,551	)	$	485		$	—	$	(35,066	)
	Other comprehensive income before reclassifications		3,056			—			—		3,056
	Amounts reclassified from accumulated other comprehensive loss		—			(485	)		—		(485	)
	Net current-period other comprehensive income (loss)		3,056			(485	)		—		2,571
	Ending balance	$	(32,495	)	$	—		$	—	$	(32,495	)
	Three Months Ended March 31, 2014	Foreign			Derivative			Unrealized		Total
		currency			adjustments			gain on
		translation						investments
		adjustments
	Beginning balance	$	(57,326	)	$	6,587		$	681	$	(50,058	)
	Other comprehensive income (loss) before reclassifications		6,619			(1,801	)		276		5,094
	Amounts reclassified from accumulated other comprehensive income		—			3			—		3
	Net current-period other comprehensive income (loss)		6,619			(1,798	)		276		5,097
	Ending balance	$	(50,707	)	$	(4,789	)	$	957	$	(44,961	)

Loss_per_Share_Tables

Loss per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Table Illustrating Computation of Basic and Diluted Loss Per Common Share	The following table illustrates the computation of basic and diluted loss per common share:
		Three Months Ended
		March 31,			March 31,
		2015			2014
	Net loss	$	(20,029	)	$	(21,605	)
	Weighted average common stock outstanding
	Basic		34,056,468			34,052,875
	Diluted		34,056,468			34,052,875
	Loss per share
	Basic	$	(0.59	)	$	(0.63	)
	Diluted	$	(0.59	)	$	(0.63	)
Table Showing Outstanding Options and Warrants Excluded from Computation of Diluted Loss Per Share	The following outstanding instruments were excluded from the computation of diluted loss per share, as they have an anti-dilutive effect on the calculation:
		Three Months Ended
		March 31,			March 31,
		2015			2014
	Options		3,068,898			3,180,925
	Warrants		—			1,425,129

Business_Basis_of_Presentation2

Business, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015
	Business_Lines
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business lines	3

Sales_of_Accounts_Receivable_a1

Sales of Accounts Receivable and Receivable Discount Program - Additional Information (Detail) (Trade Accounts Receivable [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sale of accounts receivable	$25,485	$3,139
Selling, general and administrative expenses [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-tax losses on accounts receivable	$22	$8

Inventories_Summary_of_Invento

Inventories - Summary of Inventories (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Finished goods	$33,372	$40,404
Semi-finished goods and work-in-process	75,083	68,153
Raw materials	8,119	7,520
Materials in-transit and other	1,666	6,745
Less: inventory reserve	-41,818	-47,488	-70,265	-72,400
Inventories, net	$76,422	$75,334

Inventories_Changes_in_Invento

Inventories - Changes in Inventory Reserve (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Inventory Disclosure [Abstract]
Beginning balance	($47,488)	($72,400)
Change in reserve	-896	-2,788
Write off	6,338	4,012
Translation adjustments	228	911
Ending balance	($41,818)	($70,265)

Property_Plant_and_Equipment_S

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$363,114	$364,395
Less: accumulated depreciation	-163,253	-157,341
Land	16,625	16,712
Property, plant and equipment, net	216,486	223,766
Buildings and related structures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	70,662	70,552
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	267,733	269,031
Vehicles and others [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$24,719	$24,812

Property_Plant_and_Equipment_A

Property, Plant and Equipment - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Property, Plant and Equipment [Abstract]
Depreciation expenses	$6,789	$6,850

Intangible_Assets_Summary_of_I

Intangible Assets - Summary of Intangible Assets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]
Less: accumulated amortization	($53,628)	($53,860)
Intangible assets, net	2,422	2,451
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	19,580	19,683
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	28,120	28,269
Intellectual property assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$8,350	$8,359

Intangible_Assets_Additional_I

Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expenses for intangible assets	$81	$418

Accrued_Expenses_Summary_of_Ac

Accrued Expenses - Summary of Accrued Expenses (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Payables and Accruals [Abstract]
Payroll, benefits and related taxes, excluding severance benefits	$20,888	$18,654
Withholding tax levied on intercompany interest income	28,329	27,497
Interest on senior notes	3,148	7,040
Settlement obligations	7,264	8,976
Outside service fees	7,064	10,640
Others	7,880	8,253
Accrued expenses	$74,573	$81,060

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Additional Information (Detail)	Mar. 31, 2015	Dec. 31, 2014
	Contracts	Contracts
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of derivative contracts	0	0

Derivative_Financial_Instrumen3

Derivative Financial Instruments - Impact of Derivative Instruments on Consolidated Statement of Operations (Detail) (Derivatives in ASC 815 Cash Flow Hedging Relationships [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Derivative [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)		($1,801)
Other income, net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)		-16
Net sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	485	-3
Zero cost collars [Member]
Derivative [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)		-1,801
Zero cost collars [Member] | Other income, net [Member]
Derivative [Line Items]
Amount of Loss Recognized in Statement of Operations on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)		-16
Zero cost collars [Member] | Net sales [Member]
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from AOCI into Statement of Operations (Effective Portion)	$485	($3)

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Jul. 18, 2013	Mar. 31, 2015	Dec. 31, 2014	Jul. 18, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of senior notes		$224,065,000	224,035,000
Other Asset Class [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value on recurring basis		0
6.625% senior notes due 2021 [Member] | Senior notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate	6.63%	6.63%	6.63%	6.63%
Due date	15-Jul-21	15-Jul-21	15-Jul-21
Carrying amount of senior notes		224,065,000
Estimated fair value of senior notes		$157,500,000

LongTerm_Borrowings_Components

Long-Term Borrowings - Components of Long-Term Borrowings (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Jul. 18, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Long-term borrowings, net of unamortized discount	$224,065	$224,035
Senior notes [Member] | 6.625% senior notes due 2021 [Member]
Debt Instrument [Line Items]
Long-term borrowings	225,000	225,000
Discount on senior notes	-935	-965	-1,100
Long-term borrowings, net of unamortized discount	$224,065

LongTerm_Borrowings_Components1

Long-Term Borrowings - Components of Long-Term Borrowings (Parenthetical) (Detail) (6.625% senior notes due 2021 [Member], Senior notes [Member])	0 Months Ended	3 Months Ended	12 Months Ended
	Jul. 18, 2013	Mar. 31, 2015	Dec. 31, 2014	Jul. 18, 2013
6.625% senior notes due 2021 [Member] | Senior notes [Member]
Debt Instrument [Line Items]
Interest rate	6.63%	6.63%	6.63%	6.63%
Due date	15-Jul-21	15-Jul-21	15-Jul-21

LongTerm_Borrowings_Additional

Long-Term Borrowings - Additional Information (Detail) (Senior notes [Member], USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Jul. 18, 2013	Mar. 31, 2015	Dec. 31, 2014	Jul. 18, 2013
6.625% senior notes due 2021 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$225,000,000			$225,000,000
Interest rate	6.63%	6.63%	6.63%	6.63%
Due date	15-Jul-21	15-Jul-21	15-Jul-21
Aggregate principal amount of senior notes pricing	99.50%
Proceeds from issuance of senior notes	218,800,000
Original debt issue discount	1,100,000	935,000	965,000	1,100,000
Debt issuance costs paid	5,100,000
Loss on early extinguishment of senior notes		-32,800,000
Repurchase premium on senior notes		23,800,000
Write-off of discounts, senior notes		1,900,000
Write-off of debt issuance costs		5,300,000
Interest incurred during the period		1,800,000
Percentage of redeem aggregate principal amount of Notes issued		35.00%
Redemption price plus accrued, unpaid interest and special interest to the date of redemption		106.63%
Redemption price		100.00%
Debt instrument, covenant terms		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.
Interest rate additional to base rate		0.25%
6.625% senior notes due 2021 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt acceleration period		180 days
6.625% senior notes due 2021 [Member] | 2017 [Member]
Debt Instrument [Line Items]
Redemption price plus accrued, unpaid interest and special interest to the date of redemption		103.31%
6.625% senior notes due 2021 [Member] | 2018 [Member]
Debt Instrument [Line Items]
Redemption price plus accrued, unpaid interest and special interest to the date of redemption		101.66%
6.625% senior notes due 2021 [Member] | 2019 [Member]
Debt Instrument [Line Items]
Redemption price plus accrued, unpaid interest and special interest to the date of redemption		100.00%
6.625% senior notes due 2021 [Member] | Interest Expense [Member]
Debt Instrument [Line Items]
Amortization costs		132,000
6.625% senior notes due 2021 [Member] | Other non-current assets [Member]
Debt Instrument [Line Items]
Remaining capitalized costs		$4,188,000
10.500% senior notes due 2018 [Member]
Debt Instrument [Line Items]
Interest rate		10.50%
Due date		15-Apr-18

Accrued_Severance_Benefits_Add

Accrued Severance Benefits - Additional Information (Detail)	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Percentage of employees eligible for severance benefits	98.00%

Accrued_Severance_Benefits_Cha

Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Postemployment Benefits [Abstract]
Beginning balance	$140,405	$135,356
Provisions	7,260	4,034
Severance payments	-1,341	-1,514
Translation adjustments	-726	-1,700
Ending balance	145,598	136,176
Less: Cumulative contributions to the National Pension Fund	-343	-375
Group severance insurance plan	-764	-788
Accrued severance benefits, net	$144,491	$135,013	$139,289

Accrued_Severance_Benefits_Fut

Accrued Severance Benefits - Future Benefits Payments to Employees (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Compensation and Retirement Disclosure [Abstract]
Remainder of 2015	$295
2016	1,166
2017	1,713
2018	2,903
2019	2,278
2020	3,121
2021 - 2025	$31,155

Foreign_Currency_Gain_Loss_Net1

Foreign Currency Gain (Loss), Net - Additional Information (Detail)	Mar. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified	USD ($)	KRW	KRW
Foreign Currency Transaction [Abstract]
Exchange rates using first base rate		1,105	1,099.20
Intercompany loan balance	$762

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Contingency [Line Items]
Income tax expenses	$1,133,000	$803,000
MagnaChip Semiconductor, Ltd. [Member]
Income Tax Contingency [Line Items]
Income tax expenses	$0	$0

Geographic_and_Segment_Informa2

Geographic and Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
	Customer	Customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments	1
Number of business lines	3
Customer Concentration Risk [Member] | Net Sales [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		10.00%
Number of customers	2	0
Customer Concentration Risk [Member] | Net Sales [Member] | Top Ten Customers [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	67.00%	55.00%
Number of customers	10	10
Customer Concentration Risk [Member] | Net Sales [Member] | Customer One [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	15.40%
Customer Concentration Risk [Member] | Net Sales [Member] | Customer Two [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	13.80%
Geographic Concentration Risk [Member] | Property, Plant and Equipment [Member] | Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	96.00%

Geographic_and_Segment_Informa3

Geographic and Segment Information - Net Sales by Business Line (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net Sales
Total net sales	$164,885	$164,164
Display Solutions [Member]
Net Sales
Total net sales	56,353	40,379
Semiconductor Manufacturing Services [Member]
Net Sales
Total net sales	74,520	91,928
Power Solutions [Member]
Net Sales
Total net sales	33,837	31,775
All Other [Member]
Net Sales
Total net sales	$175	$82

Geographic_and_Segment_Informa4

Geographic and Segment Information - Net Sales by Region, Based on Location of Customer (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	$164,885	$164,164
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	62,470	67,013
Asia Pacific (other than Korea) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	79,177	70,221
U.S.A. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	19,370	19,753
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	3,653	6,893
Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	$215	$284

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Equity [Abstract]
Foreign currency translation adjustments	($32,495)	($35,551)
Derivative adjustments		485
Total	($32,495)	($35,066)	($44,961)	($50,058)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	($35,066)	($50,058)
Other comprehensive income (loss) before reclassifications	3,056	5,094
Amounts reclassified from accumulated other comprehensive loss (income)	-485	3
Net current-period other comprehensive income (loss)	2,571	5,097
Ending balance	-32,495	-44,961
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	-35,551	-57,326
Other comprehensive income (loss) before reclassifications	3,056	6,619
Net current-period other comprehensive income (loss)	3,056	6,619
Ending balance	-32,495	-50,707
Derivative adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	485	6,587
Other comprehensive income (loss) before reclassifications		-1,801
Amounts reclassified from accumulated other comprehensive loss (income)	-485	3
Net current-period other comprehensive income (loss)	-485	-1,798
Ending balance		-4,789
Unrealized gain on investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		681
Other comprehensive income (loss) before reclassifications		276
Net current-period other comprehensive income (loss)		276
Ending balance		$957

Loss_per_Share_Table_Illustrat

Loss per Share - Table Illustrating Computation of Basic and Diluted Loss Per Common Share (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net loss	($20,029)	($21,605)
Weighted average common stock outstanding
Basic	34,056,468	34,052,875
Diluted	34,056,468	34,052,875
Loss per share
Basic	($0.59)	($0.63)
Diluted	($0.59)	($0.63)

Loss_per_Share_Table_Showing_O

Loss per Share - Table Showing Outstanding Options and Warrants Excluded from Computation of Diluted Loss Per Share (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted loss per share/unit	3,068,898	3,180,925
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding units and warrants excluded from computation of diluted loss per share/unit		1,425,129

Loss_per_Share_Additional_Info

Loss per Share - Additional Information (Detail) (USD $)	0 Months Ended
	Mar. 05, 2015	Mar. 31, 2015	Mar. 05, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Common stock, par value	$0.01	$0.01	$0.01	$0.01
Beneficial ownership percentage	10.00%		10.00%
Common stock dividend description	A dividend of one preferred stock purchase right (a "Right" and collectively, the "Rights") for each share of the Company's common stock
Date on which rights expire	5-Mar-16
Percentage of ownership in outstanding common stock	50.00%
Minimum [Member]
Class of Stock [Line Items]
Percentage of assets or earnings power sold	50.00%
Passive Institutional Investor [Member]
Class of Stock [Line Items]
Beneficial ownership percentage	20.00%		20.00%
Board of Directors [Member]
Class of Stock [Line Items]
Redemption price per right	$0.00
Series A Junior Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, par value	$0.01		$0.01
Purchase price of preferred Stock	$24		$24
Number of shares entitle to purchase on each right, once exercisable description	Each Right, once exercisable, will entitle the registered holder to purchase from the Company one one-thousandth of a share of Series A Junior Participating Preferred Stock

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended	1 Months Ended
	Mar. 31, 2015	28-May-15	31-May-15
	Segments	Segments
Subsequent Event [Line Items]
Number of operating segments	1
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of operating segments		2
Subsequent Event [Member] | Zero cost collars [Member]
Subsequent Event [Line Items]
Derivative counterparty			Nomura Financial Investment (Korea) Co., Ltd.
Derivative notional amount			$84,000,000
Deposit paid to counterparty			$5,000,000
6.625% senior notes due 2021 [Member] | Senior notes [Member]
Subsequent Event [Line Items]
Debt instrument, covenant terms	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.
6.625% senior notes due 2021 [Member] | Senior notes [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt instrument, covenant terms		The Company believes it has cured the default referenced in the 10-K Notice of Default within the applicable 60-day grace period under the Indenture by the filing of the 2014 10-K with the SEC on May 28, 2015.