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v2.4.1.9

Income Taxes (Schedule Of Deferred Income Tax Assets And Liabilities) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Current |  |
Assets: |  |
Accruals not currently deductible | $ 2,605,711 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | $ 2,970,671 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Stock based compensation | 13,508,845 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 13,290,429 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Impairment loss on available-for-sale securities | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Intangible Assets | 0 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 0 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Other | 4,440,407 us-gaap_DeferredTaxAssetsOther / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 4,713,241 us-gaap_DeferredTaxAssetsOther / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Total deferred income tax assets | 20,554,963 us-gaap_DeferredTaxAssetsNet / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 20,974,341 us-gaap_DeferredTaxAssetsNet / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Liabilities: |  |
Excess tax over book depreciation | 0 gntx_DeferredTaxLiabilitiesDeferredExpenseExcessTaxOverBookDepreciation / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 0 gntx_DeferredTaxLiabilitiesDeferredExpenseExcessTaxOverBookDepreciation / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Goodwill | 0 us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 0 us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Unrealized gain on investments | 0 us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 0 us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Intangible assets | 0 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 0 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Other | (1,117,956)us-gaap_DeferredTaxLiabilitiesOther / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | (558,249)us-gaap_DeferredTaxLiabilitiesOther / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Net deferred income taxes | 19,437,007 us-gaap_DeferredTaxAssetsLiabilitiesNet / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember | 20,416,092 us-gaap_DeferredTaxAssetsLiabilitiesNet / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_CurrentMember
Non-Current |  |
Assets: |  |
Accruals not currently deductible | 224,803 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | 182,803 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Stock based compensation | 2,508,304 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | 2,202,940 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Impairment loss on available-for-sale securities | 135,724 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | 175,091 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Intangible Assets | 0 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | 169,913 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Other | 19,765 us-gaap_DeferredTaxAssetsOther / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | 40,203 us-gaap_DeferredTaxAssetsOther / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Total deferred income tax assets | 2,888,596 us-gaap_DeferredTaxAssetsNet / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | 2,770,950 us-gaap_DeferredTaxAssetsNet / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Liabilities: |  |
Excess tax over book depreciation | (46,017,949)gntx_DeferredTaxLiabilitiesDeferredExpenseExcessTaxOverBookDepreciation / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | (41,374,851)gntx_DeferredTaxLiabilitiesDeferredExpenseExcessTaxOverBookDepreciation / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Goodwill | (8,868,168)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | (1,792,968)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Unrealized gain on investments | (6,368,670)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | (10,482,468)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Intangible assets | (1,205,230)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | 0 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember
Other |  |
Net deferred income taxes | $ (59,571,421)us-gaap_DeferredTaxAssetsLiabilitiesNet / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember | $ (50,879,337)us-gaap_DeferredTaxAssetsLiabilitiesNet / gntx_DeferredTaxAssetsAndLiabilitiesAxis = gntx_NonCurrentMember

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated impairment losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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