Magnachip Semiconductor (MX) 10-Q 8 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013
Document And Entity Information [Abstract]	'
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	30-Sep-13
Document Fiscal Year Focus	'2013
Document Fiscal Period Focus	'Q3
Trading Symbol	'MX
Entity Registrant Name	'MAGNACHIP SEMICONDUCTOR Corp
Entity Central Index Key	'0001325702
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Accelerated Filer
Entity Common Stock, Shares Outstanding	34,945,377

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets	'	'
Cash and cash equivalents	$158,268	$182,238
Restricted cash	6	133
Accounts receivable, net	199,018	143,331
Inventories, net	80,881	89,363
Other receivables	2,114	1,429
Prepaid expenses	11,777	7,884
Current deferred income tax assets	32,686	22,768
Other current assets	6,828	9,680
Total current assets	491,578	456,826
Property, plant and equipment, net	263,150	238,256
Intangible assets, net	8,992	15,260
Long-term prepaid expenses	17,791	18,048
Deferred income tax assets	45,253	46,710
Other non-current assets	16,731	14,866
Total assets	843,495	789,966
Current liabilities	'	'
Accounts payable	74,655	79,236
Other accounts payable	17,381	15,600
Accrued expenses	44,765	43,486
Other current liabilities	7,420	9,973
Total current liabilities	144,221	148,295
Long-term borrowings, net	223,897	201,653
Accrued severance benefits, net	123,619	112,446
Other non-current liabilities	15,018	17,263
Total liabilities	506,755	479,657
Stockholders' equity	'	'
Common stock, $0.01 par value, 150,000,000 shares authorized, 40,498,795 shares issued and 34,945,377 outstanding at September 30, 2013 and 39,599,374 shares issued and 35,635,357 outstanding at December 31, 2012	405	396
Additional paid-in capital	112,950	101,885
Retained earnings	330,953	287,251
Treasury stock, 5,553,418 and 3,964,017 shares at September 30, 2013 and December 31, 2012, respectively	-70,918	-39,918
Accumulated other comprehensive loss	-36,650	-39,305
Total stockholders' equity	336,740	310,309
Total liabilities and stockholders' equity	$843,495	$789,966

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
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	40,498,795	39,599,374
Common stock, shares outstanding	34,945,377	35,635,357
Treasury stock, shares	5,553,418	3,964,017

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]	'	'	'	'
Net sales	$217,824	$221,872	$638,411	$601,508
Cost of sales	145,936	145,432	429,732	412,295
Gross profit	71,888	76,440	208,679	189,213
Selling, general and administrative expenses	20,071	21,388	59,571	59,690
Research and development expenses	21,192	19,470	62,905	59,063
Restructuring and impairment charges	'	'	2,446	'
Operating income	30,625	35,582	83,757	70,460
Other income (expenses)	'	'	'	'
Interest expense, net	-4,548	-5,746	-16,276	-16,945
Foreign currency gain (loss), net	43,350	21,782	-186	22,305
Loss on early extinguishment of senior notes	-32,812	'	-32,812	'
Other	763	695	273	1,485
Net other income (expenses)	6,753	16,731	-49,001	6,845
Income before income taxes	37,378	52,313	34,756	77,305
Income tax expenses (benefits)	-9,293	3,901	-8,946	9,290
Net income	$46,671	$48,412	$43,702	$68,015
Earnings per common share-	'	'	'	'
Basic	$1.32	$1.34	$1.23	$1.85
Diluted	$1.24	$1.30	$1.17	$1.80
Weighted average number of shares-	'	'	'	'
Basic	35,443,820	36,199,655	35,485,395	36,810,214
Diluted	37,493,550	37,324,787	37,261,058	37,692,608

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income (loss)	$46,671	$48,412	$43,702	$68,015
Other comprehensive income	'	'	'	'
Unrealized gain (loss) on investments, net of tax	34	88	399	61
Derivative adjustments, net of tax	12,466	6,802	2,887	7,686
Foreign currency translation adjustments	-19,438	-13,271	-631	-14,017
Total comprehensive income	$39,733	$42,031	$46,357	$61,745

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Accumulated deficit) [Member]	Common Stock Held in Treasury [Member]	Accumulated Other Comprehensive Income (loss) [Member]
In Thousands, except Share data, unless otherwise specified
Balance, beginning at Dec. 31, 2011	$166,670	$394	$98,929	$93,950	($11,793)	($14,810)
Balance, Shares beginning at Dec. 31, 2011	'	37,907,575	'	'	'	'
Stock-based compensation	1,450	'	1,450	'	'	'
Issuance of new stock	46	'	46	'	'	'
Issuance of new stock, Shares	'	4,499	'	'	'	'
Exercise of stock options	410	1	409	'	'	'
Exercise of stock options, Shares	'	69,737	'	'	'	'
Acquisitions of treasury stock	-22,937	'	'	'	-22,937	'
Acquisitions of treasury stock, Shares	'	-2,026,886	'	'	'	'
Comprehensive income:	'	'	'	'	'	'
Net income (loss)	68,015	'	'	68,015	'	'
Fair valuation of derivatives	3,374	'	'	'	'	3,374
Reclassification to net income (loss) from accumulated other comprehensive loss related to hedge derivatives	4,312	'	'	'	'	4,312
Foreign currency translation adjustments	-14,017	'	'	'	'	-14,017
Unrealized gains on investments	61	'	'	'	'	61
Total comprehensive income	61,745	'	'	'	'	'
Balance, ending at Sep. 30, 2012	207,384	395	100,834	161,965	-34,730	-21,080
Balance, Shares ending at Sep. 30, 2012	'	35,954,925	'	'	'	'
Balance, beginning at Dec. 31, 2012	310,309	396	101,885	287,251	-39,918	-39,305
Balance, Shares beginning at Dec. 31, 2012	35,635,357	35,635,357	'	'	'	'
Stock-based compensation	1,398	'	1,398	'	'	'
Exercise of stock options	4,054	5	4,049	'	'	'
Exercise of stock options, Shares	'	542,746	'	'	'	'
Exercise of warrants	5,622	4	5,618	'	'	'
Exercise of warrants, Shares	'	356,675	'	'	'	'
Acquisitions of treasury stock	-31,000	'	'	'	-31,000	'
Acquisitions of treasury stock, Shares	'	-1,589,401	'	'	'	'
Comprehensive income:	'	'	'	'	'	'
Net income (loss)	43,702	'	'	43,702	'	'
Fair valuation of derivatives	3,122	'	'	'	'	3,122
Reclassification to net income (loss) from accumulated other comprehensive loss related to hedge derivatives	-235	'	'	'	'	-235
Foreign currency translation adjustments	-631	'	'	'	'	-631
Unrealized gains on investments	399	'	'	'	'	399
Total comprehensive income	46,357	'	'	'	'	'
Balance, ending at Sep. 30, 2013	$336,740	$405	$112,950	$330,953	($70,918)	($36,650)
Balance, Shares ending at Sep. 30, 2013	34,945,377	34,945,377	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities	'	'
Net income	$43,702	$68,015
Adjustments to reconcile net income to net cash provided by operating activities	'	'
Depreciation and amortization	25,629	23,840
Provision for severance benefits	15,661	16,779
Amortization of debt issuance costs and original issue discount	744	753
Loss (gain) on foreign currency translation, net	1,644	-25,304
Gain on disposal of property, plant and equipment, net	-75	-174
Loss on disposal of intangible assets, net	2	26
Restructuring and impairment charges	618	'
Stock-based compensation	1,398	1,450
Loss on early extinguishment of senior notes	32,812	'
Other	1,567	-332
Changes in operating assets and liabilities	'	'
Accounts receivable	-59,311	-18,168
Inventories	8,398	-8,526
Other receivables	-284	-1,787
Other current assets	8,168	-662
Deferred tax assets	-10,038	1,514
Accounts payable	-2,314	17,472
Other accounts payable	-7,901	-700
Accrued expenses	1,004	13,761
Other current liabilities	-663	9,450
Payment of severance benefits	-4,331	-5,569
Other	-1,814	-2,239
Net cash provided by operating activities	54,616	89,599
Cash flows from investing activities	'	'
Decrease in restricted cash	123	6,774
Proceeds from disposal of plant, property and equipment	93	937
Purchase of plant, property and equipment	-45,703	-56,745
Payment for intellectual property registration	-401	-752
Payment for purchase of Dawin, net of cash acquired	'	-8,642
Decrease in short-term financial instruments	'	173
Collection of guarantee deposits	117	72
Payment of guarantee deposits	-941	-311
Other	12	-50
Net cash used in investing activities	-46,700	-58,544
Cash flows from financing activities	'	'
Proceeds from issuance of senior notes	218,836	'
Proceeds from issuance of common stock	9,676	436
Repayment of long term borrowings	-229,333	'
Repayment of obligations under capital lease	'	-2,968
Acquisition of treasury stock	-31,000	-22,937
Net cash used in financing activities	-31,821	-25,469
Effect of exchange rates on cash and cash equivalents	-65	-2,039
Net increase (decrease) in cash and cash equivalents	-23,970	3,547
Cash and cash equivalents	'	'
Beginning of the period	182,238	162,111
End of the period	158,268	165,658
Supplemental cash flow information	'	'
Cash paid for interest	16,266	10,921
Cash paid (refunded) for income taxes	$6,397	($599)

General

General	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
General	'
	1. General
	The Company
	MagnaChip Semiconductor Corporation (together with its subsidiaries, the “Company”) is a Korea-based designer and manufacturer of analog and mixed-signal semiconductor products for high-volume consumer applications. The Company’s business is comprised of three key business segments: Display Solutions, Power Solutions and Semiconductor Manufacturing Services. The Company’s Display Solutions products include display drivers for use in a wide range of flat panel displays and mobile multimedia devices. The Company’s Power Solutions products include discrete and integrated circuit solutions for power management in high-volume consumer applications. The Company’s Semiconductor Manufacturing Services segment provides specialty analog and mixed-signal foundry services for fabless semiconductor companies that serve the consumer, computing and wireless end markets.

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	2. Significant Accounting Policies
	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 presentation 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 and nine months ended September 30, 2013 are not necessarily indicative of the results to be expected for a full year or for any other periods.
	The December 31, 2012 balance sheet data was derived from audited financial statements, but does not include all disclosures required by US GAAP.
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU No. 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”). The adoption of ASU 2013-11 will require an unrecognized tax benefit, or a portion of an unrecognized tax benefit to be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, unless an exception applies. The amendments in this update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2013. The Company is currently evaluating the effect that the provisions of ASU 2013-11 will have on its financial statements.
	In February 2013, the FASB issued ASU No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” (“ASU 2013-02”) which requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, ASU 2013-02 requires an entity to present, either on the face of the income statement or in the notes to financial statements, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under US GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts, an entity is required to cross-reference to other disclosures required under US GAAP that provide additional detail about those amounts. The update does not change the current requirements for reporting net income or other comprehensive income in financial statements and is effective prospectively for reporting periods beginning after December 15, 2012. The Company adopted ASU 2013-02 from the quarter ended March 31, 2013.
	In December 2011, the FASB issued ASU No. 2011-11, “Disclosures about Offsetting Assets and Liabilities,” (“ASU 2011-11”) which is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. This authoritative guidance was issued to enhance disclosure requirements on offsetting financial assets and liabilities. The new rules require the Company to disclose both gross and net information about instruments and transactions eligible for offset in the statement of financial position, as well as instruments and transactions subject to a netting arrangement. In January 2013, the FASB further issued ASU No. 2013-01, “Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities” (“ASU 2013-01”) to address implementation issues surrounding the scope of ASU 2011-11 and to clarify the scope of the offsetting disclosures and address any unintended consequences. The Company adopted ASU 2013-01 from the quarter ended March 31, 2013.

Sales_of_Accounts_Receivable

Sales of Accounts Receivable	9 Months Ended
	Sep. 30, 2013
Receivables [Abstract]	'
Sales of Accounts Receivable	'
	3. Sales of Accounts Receivable
	The Company has entered into an agreement to sell selected trade accounts receivable to a financial institution. 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 $24,749 thousand and $21,931 thousand for the nine month period ended September 30, 2013 and 2012, respectively, and these sales resulted in a pre-tax loss of $59 thousand and $35 thousand for the nine month period ended September 30, 2013 and 2012, respectively, which is 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.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	4. Inventories
	Inventories as of September 30, 2013 and December 31, 2012 consist of the following:
		September 30,		December 31,
		2013		2012
	Merchandise	$	7	$	7
	Finished goods		14,127		14,551
	Semi-finished goods and work-in-process		51,625		61,202
	Raw materials		11,500		11,426
	Materials in-transit		3,622		2,177
	Inventories, net	$	80,881	$	89,363

Property_Plant_and_Equipment

Property, Plant and Equipment	9 Months Ended
	Sep. 30, 2013
Property Plant And Equipment [Abstract]	'
Property, Plant and Equipment	'
	5. Property, Plant and Equipment
	Property, plant and equipment as of September 30, 2013 and December 31, 2012 comprise the following:
		September 30,			December 31,
		2013			2012
	Buildings and related structures	$	80,167		$	79,822
	Machinery and equipment		273,313			221,927
	Vehicles and others		21,058			17,143
	Equipment under capital lease		—			12,181
			374,538			331,073
	Less: accumulated depreciation		(128,467	)		(106,271	)
	accumulated depreciation on equipment under capital lease		—			(3,697	)
	Land		17,079			17,151
	Property, plant and equipment, net	$	263,150		$	238,256

Intangible_Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Intangible Assets	'
	6. Intangible Assets
	Intangible assets as of September 30, 2013 and December 31, 2012 are as follows:
		September 30,			December 31,
		2013			2012
	Technology	$	21,955		$	25,011
	Customer relationships		28,889			29,010
	Intellectual property assets		7,497			7,145
	Less: accumulated amortization		(52,696	)		(49,266	)
	Goodwill		3,347			3,360
	Intangible assets, net	$	8,992		$	15,260

Derivative_Financial_Instrumen

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Financial Instruments	'
	7. Derivative Financial Instruments
	The Company’s Korean subsidiary, MagnaChip Semiconductor, Ltd., entered into forward and 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.
	Details of derivative contracts as of September 30, 2013 are as follows:
	Date of transaction	Type of derivative		Total notional amount				Month of settlement
	December 27, 2012	Zero cost collar		$	54,000			October to December 2013
	January 25, 2013	Zero cost collar		$	54,000			January to March 2014
	March 8, 2013	Zero cost collar		$	54,000			April to June 2014
	April 5, 2013	Zero cost collar		$	54,000			July to September 2014
	May 29, 2013	Zero cost collar		$	54,000			October to December 2014
	June 21, 2013	Forward		$	30,000			October to December 2013
	The forward and 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.”
	The fair values of the Company’s outstanding forward and zero cost collar contracts recorded as assets and liabilities as of September 30, 2013 and December 31, 2012 are as follows:
	Derivatives designated as hedging instruments:			September 30,				December 31,
				2013				2012
	Asset Derivatives:
	Forward	Other current assets		$	2,271			$	514
	Zero cost collars	Other current assets			1,358				—
	Zero cost collars	Other non-current assets			976				—
	Liability Derivatives:
	Zero cost collars	Other current liabilities		$	441			$	—
	Offsetting of derivative assets and derivative liabilities as of September 30, 2013 and December 31, 2012 is as follows:
	As of September 30, 2013	Gross amounts of				Gross amounts				Net amounts of		Gross amounts not offset in the balance						Net amount
		recognized				offset in the				assets/liabilities		sheets
		assets/liabilities				balance sheets				presented in the
										balance sheets		Financial instruments			Cash collateral
															received/pledged
	Asset Derivatives:
	Forward	$	2,271			$	—			$	2,271	$	—		$	—		$	2,271
	Zero cost collars		2,334				—				2,334		(441	)		—			1,893
	Liability Derivatives:
	Zero cost collars	$	441			$	—			$	441	$	(441	)	$	—		$	—
	As of December 31, 2012	Gross amounts of				Gross amounts				Net amounts of		Gross amounts not offset in the balance						Net amount
		recognized				offset in the				assets/liabilities		sheets
		assets/liabilities				balance sheets				presented in the
										balance sheets		Financial instruments			Cash collateral
															received/pledged
	Asset Derivatives:
	Zero cost collars	$	514			$	—			$	514	$	—		$	—		$	514
	Liability Derivatives:
	Zero cost collars	$	—			$	—			$	—	$	—		$	—		$	—
	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 September 30, 2013 and 2012:
	Derivatives in ASC 815	Amount of Gain (Loss)								Location of Gain (Loss)		Amount of Gain (Loss)						Location of		Amount of Gain
	Cash Flow Hedging	Recognized in								Reclassified from		Reclassified from						Gain (Loss)		(Loss)
	Relationships	AOCI on								AOCI into		AOCI into						Recognized in		Recognized in
		Derivatives								Statement of		Statement of						Statement of		Statement of
		(Effective Portion)								Income		Income						Income on		Income on
										(Effective Portion)		(Effective Portion)						Derivative		Derivatives
																		(Ineffective		(Ineffective Portion
																		Portion and		and Amount
																		Amount		Excluded from
																		Excluded from		Effectiveness Testing)
																		Effectiveness
																		Testing)
		3M, 2013				3M, 2012						3M, 2013			3M, 2012					3M, 2013		3M, 2012
	Forward	$	2,723			$	2,338				Net sales	$	838		$	(2,783	)	Other income		$	222	$	619
																		(expenses) —
																		Others
	Zero cost collars		9,670				1,681				Net sales		(912	)		—		Other income			541		76
																		(expenses) —
																		Others
	Total	$	12,393			$	4,019					$	(74	)	$	(2,783	)			$	763	$	695
	The following table summarizes the impact of derivative instruments on the consolidated statement of operations for the nine months ended September 30, 2013 and 2012:
Derivatives in ASC 815	Amount of Gain (Loss)								Location of Gain (Loss)		Amount of Gain (Loss)						Location of		Amount of Gain
Cash Flow Hedging	Recognized in								Reclassified from		Reclassified from						Gain (Loss)		(Loss)
Relationships	AOCI on								AOCI into		AOCI into						Recognized in		Recognized in
	Derivatives								Statement of		Statement of						Statement of		Statement of
	(Effective Portion)								Income		Income						Income on		Income on
									(Effective Portion)		(Effective Portion)						Derivative		Derivatives
																	(Ineffective		(Ineffective Portion
																	Portion and		and Amount
																	Amount		Excluded from
																	Excluded from		Effectiveness Testing)
																	Effectiveness
																	Testing)
	9M, 2013				9M, 2012						9M, 2013			9M, 2012					9M, 2013		9M, 2012
Forward	$	2,508			$	1,953				Net sales	$	838		$	(2,783	)	Other income		$	116	$	1,132
																	(expenses) —
																	Others
Zero cost collars		614				1,421				Net sales		(603	)		(1,529	)	Other income			150		349
																	(expenses) —
																	Others
Total	$	3,122			$	3,374					$	235		$	(4,312	)			$	266	$	1,481
The estimated net income as of September 30, 2013 that is expected to be reclassified from accumulated other comprehensive income (loss) into earnings within the next twelve months is $2,454 thousand.
The Company’s forward and zero cost collar contracts are subject to termination upon the occurrence of the following events:
(i) On the last day of a fiscal quarter, the sum of qualified and unrestricted cash and cash equivalents held by the Company is less than $30 million.
(ii) The rating of the Company’s debt is B- or lower by Standard & Poor’s Ratings Group or any successor rating agency thereof (“S&P”) or B3 or lower by Moody’s Investor Services, Inc. or any successor rating agency thereof (“Moody’s”) or the Company’s debt ceases to be assigned a rating by either S&P or Moody’s.
In addition, the Company is required to deposit cash collateral with two financial institutions, the counterparties to the forward and zero cost collar contracts, for any exposure in excess of $5 million for each financial institution. No cash collateral was required as of September 30, 2013.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	8. Fair Value Measurements
	The Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2013, and the basis for that measurement is as follows:
		Carrying Value		Fair Value		Quoted Prices in		Significant		Significant
				Measurement		Active Markets		Other		Unobservable
						for		Observable		Inputs
						Identical Asset		Inputs		(Level 3)
						(Level 1)		(Level 2)
	Assets:
	Available-for-sale securities	$	1,147	$	1,147	$	1,147	$	—	$	—
	Other current assets		3,629		3,629		—		3,629		—
	Other non-current assets		976		976		—		976		—
	Liabilities:
	Other current liabilities		441		441		—		441		—
	As of September 30, 2013, 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 $223,897 thousand and $224,438 thousand, respectively. The estimated fair value is based on Level 2 inputs.

LongTerm_Borrowings

Long-Term Borrowings	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Long-Term Borrowings	'
	9. Long-Term Borrowings
	Long-term borrowings as of September 30, 2013 and December 31, 2012 are as follows:
		September 30,			December 31,
		2013			2012
	10.5% senior notes due April 2018 (the “2018 Notes”)	$	—		$	203,691
	6.625% senior notes due July 2021		225,000			—
	Discount on senior notes		(1,103	)		(2,038	)
	Long-term borrowings, net of unamortized discount	$	223,897		$	201,653
	6.625% Senior Notes
	On July 18, 2013, the Company issued $225,000,000 aggregate principal amount of 6.625% senior notes due July 15, 2021 at a price of 99.5%, or the 2021 Notes. Interest on the 2021Notes 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.
	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 2018 Notes, 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 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 relating to the 2021 Notes 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 will be 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 of September 30, 2013, the Company is compliant with all of its covenant requirements.
	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 $97 thousand for the three months ended September 30, 2013. The remaining capitalized costs as of September 30, 2013 were $4,942 thousand.

Accrued_Severance_Benefits

Accrued Severance Benefits	9 Months Ended
	Sep. 30, 2013
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, most 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 September 30, 2013, 98.3% of employees of the Company were eligible for severance benefits.
	Changes in accrued severance benefits for each period are as follows:
		Three			Nine			Three			Nine
		Months			Months			Months			Months
		Ended			Ended			Ended			Ended
		September 30, 2013						September 30, 2012
	Beginning balance	$	113,286		$	113,624		$	97,967		$	91,882
	Provisions		4,975			15,661			5,803			16,779
	Severance payments		(1,392	)		(4,331	)		(753	)		(5,569	)
	Translation adjustments		7,903			(182	)		3,148			3,073
			124,772			124,772			106,165			106,165
	Less: Cumulative contributions to the National Pension Fund		(380	)		(380	)		(383	)		(383	)
	Group Severance insurance plan		(773	)		(773	)		(731	)		(731	)
	Accrued severance benefits, net	$	123,619		$	123,619		$	105,051		$	105,051
	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 2013	$	—
	2014		363
	2015		372
	2016		1,334
	2017		1,687
	2018		2,998
	2019  –  2023		20,720
	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	9 Months Ended
	Sep. 30, 2013
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 our 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 September 30, 2013, the total intercompany loan balance was $556 million. The Korean won to U.S. dollar exchange rates were 1,075.6:1 and 1,071.1:1 using the first base rate as of September 30, 2013 and December 31, 2012, respectively, as quoted by the Korea Exchange Bank.

Restructuring_and_Impairment_C

Restructuring and Impairment Charges	9 Months Ended
	Sep. 30, 2013
Restructuring And Related Activities [Abstract]	'
Restructuring and Impairment Charges	'
	12. Restructuring and Impairment Charges
	The Company recognized $1,829 thousand of restructuring charges for the nine months ended September 30, 2013 from restructuring one of the Company’s fabrication facilities and $617 thousand of impairment charges from certain existing technology.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	13. Income Taxes
	The Company uses an annual effective tax rate for its income tax calculation of interim periods except for income tax related to uncertain tax positions, withholding taxes, and income tax for jurisdictions for which a reliable estimate cannot be made. The Company’s effective income tax rate was (24.9)% and 7.5% for the three months ended September 30, 2013 and 2012, respectively and (25.7)% and 12.0% for the nine months ended September 30, 2013 and 2012, respectively. The decrease in effective income tax rates for the interim periods in 2013 was primarily attributable to a decrease in deemed dividend under IRC section 956 recognized only in 2012, a tax refund by carry-back of our parent Company’s net operating loss in 2013 and an increase in deferred tax assets related to temporary differences and a tax credit related to our main operations.
	The differences between the estimated annual effective tax rates and the U.S. federal statutory rate of 35% mainly result from the application of lower tax rates associated with certain earnings from the Company’s operations outside the U.S. and the parent Company’s interest income, which is non-taxable for US tax purposes.

Geographic_and_Division_Inform

Geographic and Division Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Geographic and Division Information	'
	14. Geographic and Division Information
	The following is a summary of net sales by product division:
		Three Months Ended
		September 30,		September 30,
		2013		2012
	Net Sales
	Display Solutions	$	73,162	$	69,415
	Semiconductor Manufacturing Services		103,076		117,978
	Power Solutions		40,960		33,849
	All other		626		630
	Total net sales	$	217,824	$	221,872
		Nine Months Ended
		September 30,		September 30,
		2013		2012
	Net Sales
	Display Solutions	$	212,352	$	229,424
	Semiconductor Manufacturing Services		316,966		277,158
	Power Solutions		107,102		92,801
	All other		1,991		2,125
	Total net sales	$	638,411	$	601,508
	The following is a summary of net sales by region, based on the location of the customer:
		Three Months Ended
		September 30,		September 30,
		2013		2012
	Korea	$	116,661	$	92,914
	Asia Pacific		68,019		76,546
	U.S.A.		27,701		38,964
	Europe		4,482		11,546
	Other		961		1,902
	Total	$	217,824	$	221,872
		Nine Months Ended
		September 30,		September 30,
		2013		2012
	Korea	$	312,688	$	285,250
	Asia Pacific		210,891		208,996
	U.S.A.		83,028		78,031
	Europe		29,077		25,496
	Other		2,727		3,735
	Total	$	638,411	$	601,508
	Net sales from the Company’s top ten largest customers accounted for 62.8% and 60.4% for the three months ended September 30, 2013 and 2012, respectively, and 61.5% and 61.7% for the nine months ended September 30, 2013 and 2012, respectively.
	For the three months ended September 30, 2013, we had no customer which represented over 10% of the Company’s net sales, and for the nine months ended September 30, 2013, we had one customer which represented 11.9% of the Company’s net sales.
	For the three months ended September 30, 2012, we had two customers which represented 11.1% and 10.5% of the Company’s net sales, and for the nine months ended September 30, 2012, 12.1% and 10.5% of the Company’s net sales, respectively.
	Over 99% of the Company’s property, plant and equipment are located in Korea as of September 30, 2013.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Accumulated Other Comprehensive Loss	'
	15. Accumulated Other Comprehensive Loss
	Accumulated other comprehensive loss consists of the following as of September 30, 2013 and December 31, 2012, respectively:
		September 30,			December 31,
		2013			2012
	Foreign currency translation adjustments	$	(42,085	)	$	(41,454	)
	Derivative adjustments, net of tax		4,961			2,074
	Unrealized gain on investments, net of tax		474			75
	Total	$	(36,650	)	$	(39,305	)
	Changes in accumulated other comprehensive loss for the three months ended September 30, 2013 and 2012 is as follows:
	As of September 30, 2013	Derivative			Unrealized			Foreign			Total
		adjustments			gain on			currency
					investments			translation
								adjustments
	Beginning balance	$	(7,506	)	$	440		$	(22,646	)	$	(29,712	)
	Other comprehensive income (loss) before reclassifications		12,393			34			(19,439	)		(7,012	)
	Amounts reclassified from accumulated other comprehensive loss		74			—			—			74
	Net current-period other comprehensive income (loss)		12,467			34			(19,439	)		(6,938	)
	Ending balance	$	4,961		$	474		$	(42,085	)	$	(36,650	)
	As of September 30, 2012	Derivative			Unrealized			Foreign			Total
		adjustments			gain on			currency
					investments			translation
								adjustments
	Beginning balance	$	(6,887	)	$	63		$	(7,875	)	$	(14,699	)
	Other comprehensive income (loss) before reclassifications		4,019			88			(13,271	)		(9,164	)
	Amounts reclassified from accumulated other comprehensive loss		2,783			—			—			2,783
	Net current-period other comprehensive income (loss)		6,802			88			(13,271	)		(6,381	)
	Ending balance	$	(85	)	$	151		$	(21,146	)	$	(21,080	)
	Changes in accumulated other comprehensive loss for the nine months ended September 30, 2013 and 2012 is as follows:
	As of September 30, 2013	Derivative			Unrealized			Foreign			Total
		adjustments			gain on			currency
					investments			translation
								adjustments
	Beginning balance	$	2,074		$	75		$	(41,454	)	$	(39,305	)
	Other comprehensive income (loss) before reclassifications		3,122			399			(631	)		2,890
	Amounts reclassified from accumulated other comprehensive income		(235	)		—			—			(235	)
	Net current-period other comprehensive income (loss)		2,887			399			(631	)		2,655
	Ending balance	$	4,961		$	474		$	(42,085	)	$	(36,650	)
	As of September 30, 2012	Derivative			Unrealized			Foreign			Total
		adjustments			gain on			currency
					investments			translation
								adjustments
	Beginning balance	$	(7,771	)	$	90		$	(7,129	)	$	(14,810	)
	Other comprehensive income (loss) before reclassifications		3,374			61			(14,017	)		(10,582	)
	Amounts reclassified from accumulated other comprehensive loss		4,312			—			—			4,312
	Net current-period other comprehensive income (loss)		7,686			61			(14,017	)		(6,270	)
	Ending balance	$	(85	)	$	151		$	(21,146	)	$	(21,080	)
	For the three months ended September 30, 2013, income tax impact related to changes in derivative adjustments and unrealized gain on investments is $3,686 thousand and $11 thousand, respectively.
	For the nine months ended September 30, 2013, income tax impact related to changes in derivative adjustments and unrealized gain on investments is $846 thousand and $124 thousand, respectively.

Earnings_per_Share

Earnings per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings per Share	'
	16. Earnings per Share
	The following table illustrates the computation of basic and diluted earnings per common share:
		Three Months Ended
		September 30,		September 30,
		2013		2012
	Net income	$	46,671	$	48,412
	Weighted average common stock outstanding—
	Basic		35,443,820		36,199,655
	Diluted		37,493,550		37,324,787
	Earnings per share—
	Basic	$	1.32	$	1.34
	Diluted	$	1.24	$	1.3
		Nine Months Ended
		September 30,		September 30,
		2013		2012
	Net income	$	43,702	$	68,015
	Weighted average common stock outstanding—
	Basic		35,485,395		36,810,214
	Diluted		37,261,058		37,692,608
	Earnings per share—
	Basic	$	1.23	$	1.85
	Diluted	$	1.17	$	1.8
	The following outstanding instruments were excluded from the computation of diluted earnings per share, as they have an anti-dilutive effect on the calculation:
		Three Months Ended				Nine Months Ended
		September 30,		September 30,		September 30,		September 30,
		2013		2012		2013		2012
	Options		—		248,625		—		273,125
	Warrants		—		1,875,028		—		1,875,028

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
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 presentation 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 and nine months ended September 30, 2013 are not necessarily indicative of the results to be expected for a full year or for any other periods.
	The December 31, 2012 balance sheet data was derived from audited financial statements, but does not include all disclosures required by US GAAP.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU No. 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”). The adoption of ASU 2013-11 will require an unrecognized tax benefit, or a portion of an unrecognized tax benefit to be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, unless an exception applies. The amendments in this update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2013. The Company is currently evaluating the effect that the provisions of ASU 2013-11 will have on its financial statements.
	In February 2013, the FASB issued ASU No. 2013-02, “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” (“ASU 2013-02”) which requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, ASU 2013-02 requires an entity to present, either on the face of the income statement or in the notes to financial statements, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under US GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts, an entity is required to cross-reference to other disclosures required under US GAAP that provide additional detail about those amounts. The update does not change the current requirements for reporting net income or other comprehensive income in financial statements and is effective prospectively for reporting periods beginning after December 15, 2012. The Company adopted ASU 2013-02 from the quarter ended March 31, 2013.
	In December 2011, the FASB issued ASU No. 2011-11, “Disclosures about Offsetting Assets and Liabilities,” (“ASU 2011-11”) which is effective for annual reporting periods beginning on or after January 1, 2013, and interim periods within those annual periods. This authoritative guidance was issued to enhance disclosure requirements on offsetting financial assets and liabilities. The new rules require the Company to disclose both gross and net information about instruments and transactions eligible for offset in the statement of financial position, as well as instruments and transactions subject to a netting arrangement. In January 2013, the FASB further issued ASU No. 2013-01, “Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities” (“ASU 2013-01”) to address implementation issues surrounding the scope of ASU 2011-11 and to clarify the scope of the offsetting disclosures and address any unintended consequences. The Company adopted ASU 2013-01 from the quarter ended March 31, 2013.

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Summary of Inventories	'
	Inventories as of September 30, 2013 and December 31, 2012 consist of the following:
		September 30,		December 31,
		2013		2012
	Merchandise	$	7	$	7
	Finished goods		14,127		14,551
	Semi-finished goods and work-in-process		51,625		61,202
	Raw materials		11,500		11,426
	Materials in-transit		3,622		2,177
	Inventories, net	$	80,881	$	89,363

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	9 Months Ended
	Sep. 30, 2013
Property Plant And Equipment [Abstract]	'
Summary of Property, Plant and Equipment	'
	Property, plant and equipment as of September 30, 2013 and December 31, 2012 comprise the following:
		September 30,			December 31,
		2013			2012
	Buildings and related structures	$	80,167		$	79,822
	Machinery and equipment		273,313			221,927
	Vehicles and others		21,058			17,143
	Equipment under capital lease		—			12,181
			374,538			331,073
	Less: accumulated depreciation		(128,467	)		(106,271	)
	accumulated depreciation on equipment under capital lease		—			(3,697	)
	Land		17,079			17,151
	Property, plant and equipment, net	$	263,150		$	238,256

Intangible_Assets_Tables

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Summary of Intangible Assets	'
	Intangible assets as of September 30, 2013 and December 31, 2012 are as follows:
		September 30,			December 31,
		2013			2012
	Technology	$	21,955		$	25,011
	Customer relationships		28,889			29,010
	Intellectual property assets		7,497			7,145
	Less: accumulated amortization		(52,696	)		(49,266	)
	Goodwill		3,347			3,360
	Intangible assets, net	$	8,992		$	15,260

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Details of Derivative Contracts	'
	Details of derivative contracts as of September 30, 2013 are as follows:
	Date of transaction	Type of derivative		Total notional amount				Month of settlement
	December 27, 2012	Zero cost collar		$	54,000			October to December 2013
	January 25, 2013	Zero cost collar		$	54,000			January to March 2014
	March 8, 2013	Zero cost collar		$	54,000			April to June 2014
	April 5, 2013	Zero cost collar		$	54,000			July to September 2014
	May 29, 2013	Zero cost collar		$	54,000			October to December 2014
	June 21, 2013	Forward		$	30,000			October to December 2013
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	'
	The fair values of the Company’s outstanding forward and zero cost collar contracts recorded as assets and liabilities as of September 30, 2013 and December 31, 2012 are as follows:
	Derivatives designated as hedging instruments:			September 30,				December 31,
				2013				2012
	Asset Derivatives:
	Forward	Other current assets		$	2,271			$	514
	Zero cost collars	Other current assets			1,358				—
	Zero cost collars	Other non-current assets			976				—
	Liability Derivatives:
	Zero cost collars	Other current liabilities		$	441			$	—
Offsetting of Derivative Assets and Derivative Liabilities	'
	Offsetting of derivative assets and derivative liabilities as of September 30, 2013 and December 31, 2012 is as follows:
	As of September 30, 2013	Gross amounts of				Gross amounts				Net amounts of		Gross amounts not offset in the balance						Net amount
		recognized				offset in the				assets/liabilities		sheets
		assets/liabilities				balance sheets				presented in the
										balance sheets		Financial instruments			Cash collateral
															received/pledged
	Asset Derivatives:
	Forward	$	2,271			$	—			$	2,271	$	—		$	—		$	2,271
	Zero cost collars		2,334				—				2,334		(441	)		—			1,893
	Liability Derivatives:
	Zero cost collars	$	441			$	—			$	441	$	(441	)	$	—		$	—
	As of December 31, 2012	Gross amounts of				Gross amounts				Net amounts of		Gross amounts not offset in the balance						Net amount
		recognized				offset in the				assets/liabilities		sheets
		assets/liabilities				balance sheets				presented in the
										balance sheets		Financial instruments			Cash collateral
															received/pledged
	Asset Derivatives:
	Zero cost collars	$	514			$	—			$	514	$	—		$	—		$	514
	Liability Derivatives:
	Zero cost collars	$	—			$	—			$	—	$	—		$	—		$	—
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 September 30, 2013 and 2012:
	Derivatives in ASC 815	Amount of Gain (Loss)								Location of Gain (Loss)		Amount of Gain (Loss)						Location of		Amount of Gain
	Cash Flow Hedging	Recognized in								Reclassified from		Reclassified from						Gain (Loss)		(Loss)
	Relationships	AOCI on								AOCI into		AOCI into						Recognized in		Recognized in
		Derivatives								Statement of		Statement of						Statement of		Statement of
		(Effective Portion)								Income		Income						Income on		Income on
										(Effective Portion)		(Effective Portion)						Derivative		Derivatives
																		(Ineffective		(Ineffective Portion
																		Portion and		and Amount
																		Amount		Excluded from
																		Excluded from		Effectiveness Testing)
																		Effectiveness
																		Testing)
		3M, 2013				3M, 2012						3M, 2013			3M, 2012					3M, 2013		3M, 2012
	Forward	$	2,723			$	2,338				Net sales	$	838		$	(2,783	)	Other income		$	222	$	619
																		(expenses) —
																		Others
	Zero cost collars		9,670				1,681				Net sales		(912	)		—		Other income			541		76
																		(expenses) —
																		Others
	Total	$	12,393			$	4,019					$	(74	)	$	(2,783	)			$	763	$	695
	The following table summarizes the impact of derivative instruments on the consolidated statement of operations for the nine months ended September 30, 2013 and 2012:
	Derivatives in ASC 815	Amount of Gain (Loss)								Location of Gain (Loss)		Amount of Gain (Loss)						Location of		Amount of Gain
	Cash Flow Hedging	Recognized in								Reclassified from		Reclassified from						Gain (Loss)		(Loss)
	Relationships	AOCI on								AOCI into		AOCI into						Recognized in		Recognized in
		Derivatives								Statement of		Statement of						Statement of		Statement of
		(Effective Portion)								Income		Income						Income on		Income on
										(Effective Portion)		(Effective Portion)						Derivative		Derivatives
																		(Ineffective		(Ineffective Portion
																		Portion and		and Amount
																		Amount		Excluded from
																		Excluded from		Effectiveness Testing)
																		Effectiveness
																		Testing)
		9M, 2013				9M, 2012						9M, 2013			9M, 2012					9M, 2013		9M, 2012
	Forward	$	2,508			$	1,953				Net sales	$	838		$	(2,783	)	Other income		$	116	$	1,132
																		(expenses) —
																		Others
	Zero cost collars		614				1,421				Net sales		(603	)		(1,529	)	Other income			150		349
																		(expenses) —
																		Others
	Total	$	3,122			$	3,374					$	235		$	(4,312	)			$	266	$	1,481

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2013, and the basis for that measurement is as follows:
		Carrying Value		Fair Value		Quoted Prices in		Significant		Significant
				Measurement		Active Markets		Other		Unobservable
						for		Observable		Inputs
						Identical Asset		Inputs		(Level 3)
						(Level 1)		(Level 2)
	Assets:
	Available-for-sale securities	$	1,147	$	1,147	$	1,147	$	—	$	—
	Other current assets		3,629		3,629		—		3,629		—
	Other non-current assets		976		976		—		976		—
	Liabilities:
	Other current liabilities		441		441		—		441		—

LongTerm_Borrowings_Tables

Long-Term Borrowings (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Components of Long-term Borrowings	'
	Long-term borrowings as of September 30, 2013 and December 31, 2012 are as follows:
		September 30,			December 31,
		2013			2012
	10.5% senior notes due April 2018 (the “2018 Notes”)	$	—		$	203,691
	6.625% senior notes due July 2021		225,000			—
	Discount on senior notes		(1,103	)		(2,038	)
	Long-term borrowings, net of unamortized discount	$	223,897		$	201,653

Accrued_Severance_Benefits_Tab

Accrued Severance Benefits (Tables)	9 Months Ended
	Sep. 30, 2013
Postemployment Benefits [Abstract]	'
Changes in Accrued Severance Benefits	'
	Changes in accrued severance benefits for each period are as follows:
		Three			Nine			Three			Nine
		Months			Months			Months			Months
		Ended			Ended			Ended			Ended
		September 30, 2013						September 30, 2012
	Beginning balance	$	113,286		$	113,624		$	97,967		$	91,882
	Provisions		4,975			15,661			5,803			16,779
	Severance payments		(1,392	)		(4,331	)		(753	)		(5,569	)
	Translation adjustments		7,903			(182	)		3,148			3,073
			124,772			124,772			106,165			106,165
	Less: Cumulative contributions to the National Pension Fund		(380	)		(380	)		(383	)		(383	)
	Group Severance insurance plan		(773	)		(773	)		(731	)		(731	)
	Accrued severance benefits, net	$	123,619		$	123,619		$	105,051		$	105,051
Future Benefits Payments to Non-Executive 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 2013	$	—
	2014		363
	2015		372
	2016		1,334
	2017		1,687
	2018		2,998
	2019  –  2023		20,720

Geographic_and_Division_Inform1

Geographic and Division Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Net Sales by Product Division	'
	The following is a summary of net sales by product division:
		Three Months Ended
		September 30,		September 30,
		2013		2012
	Net Sales
	Display Solutions	$	73,162	$	69,415
	Semiconductor Manufacturing Services		103,076		117,978
	Power Solutions		40,960		33,849
	All other		626		630
	Total net sales	$	217,824	$	221,872
		Nine Months Ended
		September 30,		September 30,
		2013		2012
	Net Sales
	Display Solutions	$	212,352	$	229,424
	Semiconductor Manufacturing Services		316,966		277,158
	Power Solutions		107,102		92,801
	All other		1,991		2,125
	Total net sales	$	638,411	$	601,508
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
		September 30,		September 30,
		2013		2012
	Korea	$	116,661	$	92,914
	Asia Pacific		68,019		76,546
	U.S.A.		27,701		38,964
	Europe		4,482		11,546
	Other		961		1,902
	Total	$	217,824	$	221,872
		Nine Months Ended
		September 30,		September 30,
		2013		2012
	Korea	$	312,688	$	285,250
	Asia Pacific		210,891		208,996
	U.S.A.		83,028		78,031
	Europe		29,077		25,496
	Other		2,727		3,735
	Total	$	638,411	$	601,508

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2013
Text Block [Abstract]	'
Schedule of Accumulated Other Comprehensive Loss	'
	Accumulated other comprehensive loss consists of the following as of September 30, 2013 and December 31, 2012, respectively:
		September 30,			December 31,
		2013			2012
	Foreign currency translation adjustments	$	(42,085	)	$	(41,454	)
	Derivative adjustments, net of tax		4,961			2,074
	Unrealized gain on investments, net of tax		474			75
	Total	$	(36,650	)	$	(39,305	)
Changes in Accumulated Other Comprehensive Loss	'
	Changes in accumulated other comprehensive loss for the three months ended September 30, 2013 and 2012 is as follows:
	As of September 30, 2013	Derivative			Unrealized			Foreign			Total
		adjustments			gain on			currency
					investments			translation
								adjustments
	Beginning balance	$	(7,506	)	$	440		$	(22,646	)	$	(29,712	)
	Other comprehensive income (loss) before reclassifications		12,393			34			(19,439	)		(7,012	)
	Amounts reclassified from accumulated other comprehensive loss		74			—			—			74
	Net current-period other comprehensive income (loss)		12,467			34			(19,439	)		(6,938	)
	Ending balance	$	4,961		$	474		$	(42,085	)	$	(36,650	)
	As of September 30, 2012	Derivative			Unrealized			Foreign			Total
		adjustments			gain on			currency
					investments			translation
								adjustments
	Beginning balance	$	(6,887	)	$	63		$	(7,875	)	$	(14,699	)
	Other comprehensive income (loss) before reclassifications		4,019			88			(13,271	)		(9,164	)
	Amounts reclassified from accumulated other comprehensive loss		2,783			—			—			2,783
	Net current-period other comprehensive income (loss)		6,802			88			(13,271	)		(6,381	)
	Ending balance	$	(85	)	$	151		$	(21,146	)	$	(21,080	)
	Changes in accumulated other comprehensive loss for the nine months ended September 30, 2013 and 2012 is as follows:
	As of September 30, 2013	Derivative			Unrealized			Foreign			Total
		adjustments			gain on			currency
					investments			translation
								adjustments
	Beginning balance	$	2,074		$	75		$	(41,454	)	$	(39,305	)
	Other comprehensive income (loss) before reclassifications		3,122			399			(631	)		2,890
	Amounts reclassified from accumulated other comprehensive income		(235	)		—			—			(235	)
	Net current-period other comprehensive income (loss)		2,887			399			(631	)		2,655
	Ending balance	$	4,961		$	474		$	(42,085	)	$	(36,650	)
	As of September 30, 2012	Derivative			Unrealized			Foreign			Total
		adjustments			gain on			currency
					investments			translation
								adjustments
	Beginning balance	$	(7,771	)	$	90		$	(7,129	)	$	(14,810	)
	Other comprehensive income (loss) before reclassifications		3,374			61			(14,017	)		(10,582	)
	Amounts reclassified from accumulated other comprehensive loss		4,312			—			—			4,312
	Net current-period other comprehensive income (loss)		7,686			61			(14,017	)		(6,270	)
	Ending balance	$	(85	)	$	151		$	(21,146	)	$	(21,080	)

Earnings_per_Share_Tables

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Table Illustrating Computation of Basic and Diluted Earnings Per Common Share	'
	The following table illustrates the computation of basic and diluted earnings per common share:
		Three Months Ended
		September 30,		September 30,
		2013		2012
	Net income	$	46,671	$	48,412
	Weighted average common stock outstanding—
	Basic		35,443,820		36,199,655
	Diluted		37,493,550		37,324,787
	Earnings per share—
	Basic	$	1.32	$	1.34
	Diluted	$	1.24	$	1.3
		Nine Months Ended
		September 30,		September 30,
		2013		2012
	Net income	$	43,702	$	68,015
	Weighted average common stock outstanding—
	Basic		35,485,395		36,810,214
	Diluted		37,261,058		37,692,608
	Earnings per share—
	Basic	$	1.23	$	1.85
	Diluted	$	1.17	$	1.8
Table Showing Outstanding Options and Warrants Excluded from Computation of Diluted Earnings Per Share	'
	The following outstanding instruments were excluded from the computation of diluted earnings per share, as they have an anti-dilutive effect on the calculation:
		Three Months Ended				Nine Months Ended
		September 30,		September 30,		September 30,		September 30,
		2013		2012		2013		2012
	Options		—		248,625		—		273,125
	Warrants		—		1,875,028		—		1,875,028

General_Additional_Information

General - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
	Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Number of segments	3

Sales_of_Accounts_Receivable_A

Sales of Accounts Receivable - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Receivables [Abstract]	'	'
Proceeds from sale of accounts receivable	$24,749	$21,931
Pre-tax loss on accounts receivable	$59	$35

Inventories_Summary_of_Invento

Inventories - Summary of Inventories (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Merchandise	$7	$7
Finished goods	14,127	14,551
Semi-finished goods and work-in-process	51,625	61,202
Raw materials	11,500	11,426
Materials in-transit	3,622	2,177
Inventories, net	$80,881	$89,363

Property_Plant_and_Equipment_S

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	$374,538	$331,073
Less: accumulated depreciation	-128,467	-106,271
Accumulated depreciation on equipment under capital lease	'	-3,697
Property, plant and equipment, net	263,150	238,256
Buildings and related structures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	80,167	79,822
Machinery and equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	273,313	221,927
Vehicles and others [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	21,058	17,143
Equipment under capital lease [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	'	12,181
Land [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, net	$17,079	$17,151

Intangible_Assets_Summary_of_I

Intangible Assets - Summary of Intangible Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Less: accumulated amortization	($52,696)	($49,266)
Goodwill	3,347	3,360
Intangible assets, net	8,992	15,260
Technology [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, gross	21,955	25,011
Customer relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, gross	28,889	29,010
Intellectual property assets [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Intangible assets, gross	$7,497	$7,145

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Details of Derivative Contracts (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Zero cost collar one [Member]	'
Derivative [Line Items]	'
Date of transaction	27-Dec-12
Type of derivative	'Zero cost collar
Total notional amount	$54,000
Month of settlement	'October to December 2013
Zero cost collar two [Member]	'
Derivative [Line Items]	'
Date of transaction	25-Jan-13
Type of derivative	'Zero cost collar
Total notional amount	54,000
Month of settlement	'January to March 2014
Zero cost collar three [Member]	'
Derivative [Line Items]	'
Date of transaction	8-Mar-13
Type of derivative	'Zero cost collar
Total notional amount	54,000
Month of settlement	'April to June 2014
Zero cost collar four [Member]	'
Derivative [Line Items]	'
Date of transaction	5-Apr-13
Type of derivative	'Zero cost collar
Total notional amount	54,000
Month of settlement	'July to September 2014
Zero cost collar five [Member]	'
Derivative [Line Items]	'
Date of transaction	29-May-13
Type of derivative	'Zero cost collar
Total notional amount	54,000
Month of settlement	'October to December 2014
Forward [Member]	'
Derivative [Line Items]	'
Date of transaction	21-Jun-13
Type of derivative	'Forward
Total notional amount	$30,000
Month of settlement	'October to December 2013

Derivative_Financial_Instrumen3

Derivative Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Detail) (Derivative designated as hedging instrument [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other current assets [Member] | Forward [Member]	'	'
Asset Derivatives:	'	'
Derivatives designated as hedging instruments, Asset	$2,271	$514
Other current assets [Member] | Zero cost collars [Member]	'	'
Asset Derivatives:	'	'
Derivatives designated as hedging instruments, Asset	1,358	'
Other non-current assets [Member] | Zero cost collars [Member]	'	'
Asset Derivatives:	'	'
Derivatives designated as hedging instruments, Asset	976	'
Other current liabilities [Member] | Zero cost collars [Member]	'	'
Liability Derivatives:	'	'
Derivatives designated as hedging instruments, Liability	$441	'

Derivative_Financial_Instrumen4

Derivative Financial Instruments - Offsetting of Derivative Assets and Derivative Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Forward [Member]	'	'
Derivative [Line Items]	'	'
Asset Derivatives, Gross amounts of recognized assets/liabilities	$2,271	'
Asset Derivatives, Gross amounts offset in the balance sheets	'	'
Asset Derivatives, Net amounts of assets/liabilities presented in the balance sheets	2,271	'
Asset Derivatives, Gross amounts not offset in the balance sheets, Cash collateral received/pledged	'	'
Asset Derivatives, Gross amounts not offset in the balance sheets, Net amount	2,271	'
Zero cost collars [Member]	'	'
Derivative [Line Items]	'	'
Asset Derivatives, Gross amounts of recognized assets/liabilities	2,334	514
Liability Derivatives, Gross amounts of recognized assets/liabilities	441	'
Asset Derivatives, Gross amounts offset in the balance sheets	'	'
Liability Derivatives, Gross amounts offset in the balance sheets	'	'
Asset Derivatives, Net amounts of assets/liabilities presented in the balance sheets	2,334	514
Liability Derivatives, Net amounts of assets/liabilities presented in the balance sheets	441	'
Asset Derivatives, Gross amounts not offset in the balance sheets, Financial instruments	-441	'
Liability Derivatives, Gross amounts not offset in the balance sheets, Financial instruments	-441	'
Asset Derivatives, Gross amounts not offset in the balance sheets, Cash collateral received/pledged	'	'
Liability Derivatives, Gross amounts not offset in the balance sheets, Cash collateral received/pledged	'	'
Asset Derivatives, Gross amounts not offset in the balance sheets, Net amount	1,893	514
Liability Derivatives, Gross amounts not offset in the balance sheets, Net amount	'	'

Derivative_Financial_Instrumen5

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		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$12,393	$4,019	$3,122	$3,374
Other income (expenses) - Others [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Recognized in Statement of Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	763	695	266	1,481
Net sales [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Reclassified from AOCI into Statement of Income (Effective Portion)	-74	-2,783	235	-4,312
Forward [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	2,723	2,338	2,508	1,953
Forward [Member] | Other income (expenses) - Others [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Recognized in Statement of Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	222	619	116	1,132
Forward [Member] | Net sales [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Reclassified from AOCI into Statement of Income (Effective Portion)	838	-2,783	838	-2,783
Zero cost collars [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	9,670	1,681	614	1,421
Zero cost collars [Member] | Other income (expenses) - Others [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Recognized in Statement of Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	541	76	150	349
Zero cost collars [Member] | Net sales [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Amount of Gain (Loss) Reclassified from AOCI into Statement of Income (Effective Portion)	($912)	'	($603)	($1,529)

Derivative_Financial_Instrumen6

Derivative Financial Instruments - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Estimated net income reclassified from accumulated other comprehensive income (loss) into earnings, period	'12 months
Estimated net income reclassified from accumulated other comprehensive income (loss) into earnings	$2,454,000
Cash and cash equivalents	30,000,000
Deposit of cash collateral in excess	$5,000,000

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:	'	'
Other current assets	$6,828	$9,680
Other non-current assets	16,731	14,866
Other current liabilities	7,420	9,973
Assets and liabilities measured at fair value on recurring basis [Member] | Carrying Value [Member]	'	'
Assets:	'	'
Available-for-sale securities	1,147	'
Other current assets	3,629	'
Other non-current assets	976	'
Other current liabilities	441	'
Assets and liabilities measured at fair value on recurring basis [Member] | Fair Value Measurement [Member]	'	'
Assets:	'	'
Available-for-sale securities	1,147	'
Other current assets	3,629	'
Other non-current assets	976	'
Other current liabilities	441	'
Assets and liabilities measured at fair value on recurring basis [Member] | Quoted Prices in Active Markets for Identical Asset (Level 1) [Member]	'	'
Assets:	'	'
Available-for-sale securities	1,147	'
Assets and liabilities measured at fair value on recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]	'	'
Assets:	'	'
Available-for-sale securities	'	'
Other current assets	3,629	'
Other non-current assets	976	'
Other current liabilities	441	'
Assets and liabilities measured at fair value on recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]	'	'
Assets:	'	'
Available-for-sale securities	'	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013
In Thousands, unless otherwise specified			Senior Notes Due 2021 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Senior Notes, percentage	'	'	6.63%
Senior Notes, maturity year	'	'	'2021
Carrying amount of Senior Notes	$223,897	$201,653	$223,897
Estimated fair value of Senior Notes	'	'	$224,438

LonTerm_Borrowings_Components_

Lon-Term Borrowings - Components of Long-term Borrowings (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Discount on senior notes	($1,103)	($2,038)
Long-term borrowings, net of unamortized discount	223,897	201,653
10.5% senior notes due 2018 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term borrowings	'	203,691
6.625% senior notes due 2021 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term borrowings	$225,000	'

LonTerm_Borrowings_Components_1

Lon-Term Borrowings - Components of Long-term Borrowings (Parenthetical) (Detail)	1 Months Ended	9 Months Ended	12 Months Ended
	Jul. 18, 2013	Sep. 30, 2013	Dec. 31, 2012
10.5% senior notes due 2018 [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Interest rate	'	10.50%	10.50%
Due date	'	15-Apr-18	15-Apr-18
6.625% senior notes due 2021 [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Interest rate	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) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jul. 18, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
					6.625% senior notes due 2021 [Member]	6.625% senior notes due 2021 [Member]	6.625% senior notes due 2021 [Member]	6.625% senior notes due 2021 [Member]	6.625% senior notes due 2021 [Member]	6.625% senior notes due 2021 [Member]	6.625% senior notes due 2021 [Member]
								Amortization costs [Member]	2017 [Member]	2018 [Member]	2019 [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Aggregate principal amount	'	'	'	'	$225,000,000	'	'	'	'	'	'
Interest rate	'	'	'	'	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%	'	'	'	'	'	'
Net proceeds from senior notes	'	'	'	'	218,800,000	'	'	'	'	'	'
Original debt issue discount	'	'	'	'	1,100,000	'	'	'	'	'	'
Debt issuance costs paid	'	'	'	'	5,100,000	'	'	'	'	'	'
Loss on early extinguishment of senior notes	32,812,000	'	32,812,000	'	'	32,812,000	'	'	'	'	'
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%	'	'	103.31%	101.66%	100.00%
Redemption price	'	'	'	'	'	100.00%	'	'	'	'	'
Interest expense, net	4,548,000	5,746,000	16,276,000	16,945,000	'	'	'	97,000	'	'	'
Remaining capitalized costs	'	'	'	'	'	$4,942,000	'	'	'	'	'

Accrued_Severance_Benefits_Add

Accrued Severance Benefits - Additional Information (Detail)	Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'
Eligible employees for severance benefits	98.30%

Accrued_Severance_Benefits_Cha

Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified			Employee severance [Member]	Employee severance [Member]	Employee severance [Member]	Employee severance [Member]
Restructuring Cost and Reserve [Line Items]	'	'	'	'	'	'
Beginning balance	'	'	$113,286	$97,967	$113,624	$91,882
Provisions	'	'	4,975	5,803	15,661	16,779
Severance payments	'	'	-1,392	-753	-4,331	-5,569
Translation adjustments	'	'	7,903	3,148	-182	3,073
Ending balance	'	'	124,772	106,165	124,772	106,165
Less: Cumulative contributions to the National Pension Fund	'	'	-380	-383	-380	-383
Group Severance insurance plan	'	'	-773	-731	-773	-731
Accrued severance benefits, net	$123,619	$112,446	$123,619	$105,051	$123,619	$105,051

Accrued_Severance_Benefits_Fut

Accrued Severance Benefits - Future Benefits Payments to Non-Executive Employees (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified
Compensation And Retirement Disclosure [Abstract]	'
Remainder of 2013	'
2014	363
2015	372
2016	1,334
2017	1,687
2018	2,998
2019 - 2023	$20,720

Foreign_Currency_Gain_Loss_Net1

Foreign Currency Gain (Loss), Net - Additional Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Foreign Currency Transaction [Abstract]	'	'
Exchange rates using first base rate	1,075.60	1,071.10
Intercompany loan balance	$556	'

Restructuring_and_Impairment_C1

Restructuring and Impairment Charges - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]	'
Impairment charges	$617
Restructuring of Fabrication Facility [Member]	'
Restructuring Cost and Reserve [Line Items]	'
Restructuring charges	$1,829

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]	'	'	'	'
Effective income tax rate	-24.90%	7.50%	-25.70%	12.00%
Differences between estimated annual effective tax rates and U.S. federal statutory rate	'	'	35.00%	'

Geographic_and_Division_Inform2

Geographic and Division Information - Net Sales by Product Division (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Sales	'	'	'	'
Total net sales	$217,824	$221,872	$638,411	$601,508
Display Solutions [Member]	'	'	'	'
Net Sales	'	'	'	'
Total net sales	73,162	69,415	212,352	229,424
Semiconductor Manufacturing Services [Member]	'	'	'	'
Net Sales	'	'	'	'
Total net sales	103,076	117,978	316,966	277,158
Power Solutions [Member]	'	'	'	'
Net Sales	'	'	'	'
Total net sales	40,960	33,849	107,102	92,801
All other [Member]	'	'	'	'
Net Sales	'	'	'	'
Total net sales	$626	$630	$1,991	$2,125

Geographic_and_Division_Inform3

Geographic and Division Information - Net Sales by Region, Based on Location of Customer (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Total net sales	$217,824	$221,872	$638,411	$601,508
Korea [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Total net sales	116,661	92,914	312,688	285,250
Asia Pacific [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Total net sales	68,019	76,546	210,891	208,996
U.S.A. [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Total net sales	27,701	38,964	83,028	78,031
Europe [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Total net sales	4,482	11,546	29,077	25,496
Other [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Total net sales	$961	$1,902	$2,727	$3,735

Geographic_and_Division_Inform4

Geographic and Division Information - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Customer Concentration Risk [Member] | Net sales [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Concentration risk, percentage	10.00%	'	'	'
Customer Concentration Risk [Member] | Net sales [Member] | Top Ten Customers [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Concentration risk, percentage	62.80%	60.40%	61.50%	61.70%
Customer Concentration Risk [Member] | Net sales [Member] | Customer One [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Concentration risk, percentage	'	11.10%	11.90%	12.10%
Customer Concentration Risk [Member] | Net sales [Member] | Customer Two [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Concentration risk, percentage	'	10.50%	'	10.50%
Geographic Concentration Risk [Member] | Property, Plant and Equipment [Member] | Korea [Member]	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'
Concentration risk, percentage	'	'	99.00%	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $)	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Equity [Abstract]	'	'	'	'	'
Foreign currency translation adjustments	($42,085)	'	($41,454)	'	'
Derivative adjustments, net of tax	4,961	'	2,074	'	'
Unrealized gain on investments, net of tax	474	'	75	'	'
Total	($36,650)	($29,712)	($39,305)	($14,699)	($14,810)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]	'	'	'	'	'
Beginning balance	($29,712)	($14,699)	($39,305)	($14,810)	($36,650)
Other comprehensive income (loss) before reclassifications	-7,012	-9,164	2,890	-10,582	'
Amounts reclassified from accumulated other comprehensive (income) loss	74	2,783	-235	4,312	'
Net current-period other comprehensive income (loss)	-6,938	-6,381	2,655	-6,270	'
Ending balance	-36,650	-21,080	-36,650	-21,080	'
Derivative adjustments [Member]	'	'	'	'	'
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]	'	'	'	'	'
Beginning balance	-7,506	-6,887	2,074	-7,771	'
Other comprehensive income (loss) before reclassifications	12,393	4,019	3,122	3,374	'
Amounts reclassified from accumulated other comprehensive (income) loss	74	2,783	-235	4,312	'
Net current-period other comprehensive income (loss)	12,467	6,802	2,887	7,686	'
Ending balance	4,961	-85	4,961	-85	'
Unrealized gain on investments [Member]	'	'	'	'	'
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]	'	'	'	'	'
Beginning balance	440	63	75	90	'
Other comprehensive income (loss) before reclassifications	34	88	399	61	'
Net current-period other comprehensive income (loss)	34	88	399	61	'
Ending balance	474	151	474	151	'
Foreign currency translation adjustments [Member]	'	'	'	'	'
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]	'	'	'	'	'
Beginning balance	-22,646	-7,875	-41,454	-7,129	'
Other comprehensive income (loss) before reclassifications	-19,439	-13,271	-631	-14,017	'
Net current-period other comprehensive income (loss)	-19,439	-13,271	-631	-14,017	'
Ending balance	($42,085)	($21,146)	($42,085)	($21,146)	'

Accumulated_Other_Comprehensiv4

Accumulated Other Comprehensive Loss - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
Derivative adjustments [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Income tax impact related to changes in derivative adjustments and unrealized gain on investments	$3,686	$846
Unrealized gain on investments [Member]	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Income tax impact related to changes in derivative adjustments and unrealized gain on investments	$11	$124

Earnings_per_Share_Table_Illus

Earnings per Share - Table Illustrating Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Net income	$46,671	$48,412	$43,702	$68,015
Weighted average common stock outstanding-	'	'	'	'
Basic	35,443,820	36,199,655	35,485,395	36,810,214
Diluted	37,493,550	37,324,787	37,261,058	37,692,608
Earnings per share-	'	'	'	'
Basic	$1.32	$1.34	$1.23	$1.85
Diluted	$1.24	$1.30	$1.17	$1.80

Earnings_per_Share_Table_Showi

Earnings per Share - Table Showing Outstanding Options and Warrants Excluded from Computation of Diluted Earnings Per Share (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Options [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Outstanding units and warrants excluded from computation of diluted earnings (loss) per share/unit	'	248,625	'	273,125
Warrants [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Outstanding units and warrants excluded from computation of diluted earnings (loss) per share/unit	'	1,875,028	'	1,875,028