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Investment securities (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2012	May 31, 2014	Mar. 31, 2014	Oct. 31, 2014	Aug. 10, 2010
Security Owned Not Readily Marketable [Line Items]
Impairment loss on investment	$ 309us-gaap_ImpairmentOfInvestments	$ 0us-gaap_ImpairmentOfInvestments	$ 1,299us-gaap_ImpairmentOfInvestments
Gains (losses) on sale of securities, net	10,471us-gaap_GainLossOnSaleOfSecuritiesNet	(8)us-gaap_GainLossOnSaleOfSecuritiesNet	648us-gaap_GainLossOnSaleOfSecuritiesNet
Corporate Convertible Bonds [Member]
Security Owned Not Readily Marketable [Line Items]
Purchase Of Corporate Convertible Bonds								1,620,000himx_PurchaseOfCorporateCovertibleBonds / us-gaap_InvestmentTypeAxis = himx_CorporateConvertibleBondsMember
Proceeds From Sale Of Bond				5,431himx_ProceedsFromSaleOfBond / us-gaap_InvestmentTypeAxis = himx_CorporateConvertibleBondsMember
Debt Instrument, Convertible, Conversion Ratio				0.6020us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_InvestmentTypeAxis = himx_CorporateConvertibleBondsMember
Gains (losses) on sale of securities, net				645us-gaap_GainLossOnSaleOfSecuritiesNet / us-gaap_InvestmentTypeAxis = himx_CorporateConvertibleBondsMember
L Company [Member]
Security Owned Not Readily Marketable [Line Items]
Proceeds from Sale, Maturity and Collection of Investments					14,743us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / himx_CostMethodInvesteeNameAxis = himx_LCompanyMember
Gains (losses) on sale of securities, net					10,743us-gaap_GainLossOnSaleOfSecuritiesNet / himx_CostMethodInvesteeNameAxis = himx_LCompanyMember
S Company [Member]
Security Owned Not Readily Marketable [Line Items]
Proceeds from Sale, Maturity and Collection of Investments						4,948us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments / himx_CostMethodInvesteeNameAxis = himx_SCompanyMember
Gains (losses) on sale of securities, net						(241)us-gaap_GainLossOnSaleOfSecuritiesNet / himx_CostMethodInvesteeNameAxis = himx_SCompanyMember
Jetronics International Corp [Member]
Security Owned Not Readily Marketable [Line Items]
Proceeds From Capital Reduction Of Investments							1,168himx_ProceedsFromCapitalReductionOfInvestments / dei_LegalEntityAxis = himx_JetronicsInternationalCorpMember
Oculon Optoelectronics Inc [Member]
Security Owned Not Readily Marketable [Line Items]
Impairment loss on investment	309us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = himx_OculonOptoelectronicsIncMember
Eturbotouch Technology Inc [Member]
Security Owned Not Readily Marketable [Line Items]
Impairment loss on investment			$ 238us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = himx_EturbotouchTechnologyIncMember

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- Definition

The cash inflow from capital reduction of Investments.

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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