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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax [Line Items]
Expected income tax expense	$ 14,534himx_IncomeTaxReconciliationExpectedIncomeTaxExpense	$ 12,818himx_IncomeTaxReconciliationExpectedIncomeTaxExpense	$ 11,201himx_IncomeTaxReconciliationExpectedIncomeTaxExpense
Tax on undistributed retained earnings	6,814himx_IncomeTaxReconciliationTaxOnUndistributedRetainedEarnings	4,700himx_IncomeTaxReconciliationTaxOnUndistributedRetainedEarnings	3,341himx_IncomeTaxReconciliationTaxOnUndistributedRetainedEarnings
Tax-exempted income	(2,843)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(2,392)us-gaap_IncomeTaxReconciliationTaxExemptIncome	(2,921)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Tax benefit resulting from setting aside legal reserve from prior year's income	(651)himx_IncomeTaxReconciliationTaxBenefitFromPriorYearLegalReserve	(558)himx_IncomeTaxReconciliationTaxBenefitFromPriorYearLegalReserve	(571)himx_IncomeTaxReconciliationTaxBenefitFromPriorYearLegalReserve
Realized tax losses on investments in subsidiaries due to capital reduction to offset the accumulated deficit	(489)himx_IncomeTaxReconciliationInvestmentLossFromSubsidiary	0himx_IncomeTaxReconciliationInvestmentLossFromSubsidiary	(6,157)himx_IncomeTaxReconciliationInvestmentLossFromSubsidiary
Increase in investment tax credits	(4,525)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment	0us-gaap_IncomeTaxReconciliationTaxCreditsInvestment	(1,210)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment
Expired investment tax credits	0himx_IncomeTaxReconciliationExpiredInvestmentTaxCredits	0himx_IncomeTaxReconciliationExpiredInvestmentTaxCredits	5,302himx_IncomeTaxReconciliationExpiredInvestmentTaxCredits
Increase in deferred tax asset valuation allowance	4,038us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	3,146us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	8,219us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Changes in unrecognized tax benefits related to prior year tax positions, net of its impact to tax-exempted income	305himx_IncomeTaxReconciliationDecreaseInUnrecognizedTaxBenefitsRelatedToPriorYearUncertainTaxPositions	(215)himx_IncomeTaxReconciliationDecreaseInUnrecognizedTaxBenefitsRelatedToPriorYearUncertainTaxPositions	658himx_IncomeTaxReconciliationDecreaseInUnrecognizedTaxBenefitsRelatedToPriorYearUncertainTaxPositions
Tax effect resulting from foreign currency matters	5,593himx_IncomeTaxReconciliationTaxEffectRemeasuringForeignEntitiesNonMonetaryAssets	2,278himx_IncomeTaxReconciliationTaxEffectRemeasuringForeignEntitiesNonMonetaryAssets	(3,607)himx_IncomeTaxReconciliationTaxEffectRemeasuringForeignEntitiesNonMonetaryAssets
Foreign tax rate differential	(2,143)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	612us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1,415us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Variance from audits, amendments and examinations of prior years' income tax filings	37himx_IncomeTaxReconciliationVarianceFromAuditsOfPriorYearsIncomeTaxFilings	(1,376)himx_IncomeTaxReconciliationVarianceFromAuditsOfPriorYearsIncomeTaxFilings	40himx_IncomeTaxReconciliationVarianceFromAuditsOfPriorYearsIncomeTaxFilings
Others	921us-gaap_IncomeTaxReconciliationOtherAdjustments	463us-gaap_IncomeTaxReconciliationOtherAdjustments	38us-gaap_IncomeTaxReconciliationOtherAdjustments
Actual income tax expense	$ 21,591us-gaap_IncomeTaxExpenseBenefit	$ 19,476us-gaap_IncomeTaxExpenseBenefit	$ 15,748us-gaap_IncomeTaxExpenseBenefit

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to decrease in unrecognized tax benefits related to prior year uncertain tax positions.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to investment loss from subsidiary.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to tax benefit from prior year legal reserve.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to tax effect of the difference resulting from re-measuring foreign entities non monetary assets.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to tax on undistributed retained earnings.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to variance from audits of prior years income tax filings.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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