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Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net | 342,050,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 346,875,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | [1]
Gentex Patents |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 30,363,189 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 30,132,116 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Finite-lived intangible assets, accumulated amortization | (11,713,249)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | (11,065,153)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Finite-lived intangible assets, net | 18,649,940 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember | 19,066,963 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentsMember |
Patents and Other Intangible Assets [Member] |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, accumulated amortization | (40,663,249)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gntx_PatentsandOtherIntangibleAssetsMember | (35,190,153)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gntx_PatentsandOtherIntangibleAssetsMember |
Intangible assets, gross | 401,363,189 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gntx_PatentsandOtherIntangibleAssetsMember | 401,132,116 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gntx_PatentsandOtherIntangibleAssetsMember |
Intangible assets, net | 360,699,940 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gntx_PatentsandOtherIntangibleAssetsMember | 365,941,963 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = gntx_PatentsandOtherIntangibleAssetsMember |
HomeLink® |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, accumulated amortization | (28,950,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember | (24,125,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember |
Intangible assets, gross | 371,000,000 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember | 371,000,000 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember |
Intangible assets, net | 342,050,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember | 346,875,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember |
HomeLink® | Homelink Technology |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 180,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 180,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Finite-lived intangible assets, accumulated amortization | (22,500,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | (18,750,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Finite-lived intangible assets, net | 157,500,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 161,250,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
HomeLink® | Homelink Technology | Minimum [Member] |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible asset, useful life | 12 years 0 days | 12 years |
HomeLink® | Existing Customer Platforms |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 43,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember | 43,000,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |
Finite-lived intangible assets, accumulated amortization | (6,450,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember | (5,375,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |
Finite-lived intangible assets, net | 36,550,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember | 37,625,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |
Finite-lived intangible asset, useful life | 10 years | 10 years |
HomeLink® | HomeLink Trade Names and Trademarks |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 52,000,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | 52,000,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |
HomeLink® | Exclusive Licensing Agreement |  |  |
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 96,000,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 96,000,000 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = gntx_HomeLinkMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
[1] | Note: The condensed consolidated balance sheet at December 31, 2014 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

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