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Investment securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	$ 11,211us-gaap_CostMethodInvestments	$ 21,877us-gaap_CostMethodInvestments
Chi Lin Optoelectronics Co Ltd [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	625us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_ChiLinOptoelectronicsCoLtdMember	625us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_ChiLinOptoelectronicsCoLtdMember
Chi Lin Technology Co Ltd [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	432us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_ChiLinTechnologyCoLtdMember	432us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_ChiLinTechnologyCoLtdMember
Jetronics International Corp [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	432us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_JetronicsInternationalCorpMember	1,600us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_JetronicsInternationalCorpMember
C Company [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	8,962us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_CCompanyMember	8,962us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_CCompanyMember
S Company [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	0us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_SCompanyMember	5,189us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_SCompanyMember
L Company [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	0us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_LCompanyMember	4,000us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_LCompanyMember
eTurboTouch Technology Inc [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	477us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_EturbotouchTechnologyIncMember	477us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_EturbotouchTechnologyIncMember
Oculon Optoelectronics Inc [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	0us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_OculonOptoelectronicsIncMember	309us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_OculonOptoelectronicsIncMember
Shinyoptics Corp [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	$ 283us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_ShinyopticsCorpMember	$ 283us-gaap_CostMethodInvestments / himx_CostMethodInvesteeNameAxis = himx_ShinyopticsCorpMember

X

- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-Section 35

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594

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