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Segment Reporting (Schedule of Automotive and Other Segment Reporting) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 350,411,000 us-gaap_SalesRevenueGoodsNet | $ 350,914,000 us-gaap_SalesRevenueGoodsNet | $ 338,437,000 us-gaap_SalesRevenueGoodsNet | $ 335,739,000 us-gaap_SalesRevenueGoodsNet | $ 326,770,000 us-gaap_SalesRevenueGoodsNet | $ 288,622,000 us-gaap_SalesRevenueGoodsNet | $ 286,974,000 us-gaap_SalesRevenueGoodsNet | $ 269,499,000 us-gaap_SalesRevenueGoodsNet | $ 1,375,501,159 us-gaap_SalesRevenueGoodsNet | $ 1,171,864,171 us-gaap_SalesRevenueGoodsNet | $ 1,099,559,521 us-gaap_SalesRevenueGoodsNet
Income (Loss) from Operations | 98,615,000 us-gaap_OperatingIncomeLoss | 103,206,000 us-gaap_OperatingIncomeLoss | 99,835,000 us-gaap_OperatingIncomeLoss | 97,178,000 us-gaap_OperatingIncomeLoss | 95,636,000 us-gaap_OperatingIncomeLoss | 73,656,000 us-gaap_OperatingIncomeLoss | 71,596,000 us-gaap_OperatingIncomeLoss | 63,854,000 us-gaap_OperatingIncomeLoss | 398,834,174 us-gaap_OperatingIncomeLoss | 304,741,813 us-gaap_OperatingIncomeLoss | 234,455,232 us-gaap_OperatingIncomeLoss
Assets | 2,022,540,029 us-gaap_Assets |  |  |  | 1,764,088,434 us-gaap_Assets |  |  |  | 2,022,540,029 us-gaap_Assets | 1,764,088,434 us-gaap_Assets | 1,265,691,335 us-gaap_Assets
Depreciation & Amortization |  |  |  |  |  |  |  |  | 77,376,305 us-gaap_DepreciationDepletionAndAmortization | 62,854,155 us-gaap_DepreciationDepletionAndAmortization | 50,179,823 us-gaap_DepreciationDepletionAndAmortization
Capital Expenditures |  |  |  |  |  |  |  |  | 72,518,987 us-gaap_PaymentsToAcquireProductiveAssets | 55,380,457 us-gaap_PaymentsToAcquireProductiveAssets | 117,474,449 us-gaap_PaymentsToAcquireProductiveAssets
Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Operations |  |  |  |  |  |  |  |  | 386,762,986 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember | 298,465,299 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember | 231,713,972 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember
Assets | 1,333,615,389 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember |  |  |  | 1,290,801,674 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember |  |  |  | 1,333,615,389 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember | 1,290,801,674 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember | 619,337,527 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember
Depreciation & Amortization |  |  |  |  |  |  |  |  | 75,320,999 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember | 58,723,222 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember | 47,976,800 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember
Capital Expenditures |  |  |  |  |  |  |  |  | 71,032,115 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember | 54,020,792 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember | 113,611,526 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 35,378,885 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 27,876,044 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 22,586,580 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember
Income (Loss) from Operations |  |  |  |  |  |  |  |  | 12,071,188 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 6,276,514 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 2,741,260 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember
Assets | 8,841,958 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember |  |  |  | 9,001,278 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember |  |  |  | 8,841,958 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 9,001,278 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 8,010,779 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember
Depreciation & Amortization |  |  |  |  |  |  |  |  | 321,426 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 316,836 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 317,534 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember
Capital Expenditures |  |  |  |  |  |  |  |  | 145,704 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 301,697 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember | 228,635 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = gntx_OtherSegmentMember
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 680,082,682 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | 464,285,482 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  |  |  | 680,082,682 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 464,285,482 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 638,343,029 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Depreciation & Amortization |  |  |  |  |  |  |  |  | 1,733,880 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 3,814,097 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 1,885,489 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Capital Expenditures |  |  |  |  |  |  |  |  | 1,341,168 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 1,057,968 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 3,634,288 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
United States | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 444,921,897 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_US | 400,654,021 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_US | 382,308,501 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_US
Germany | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 262,505,346 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_DE | 244,949,664 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_DE | 239,081,723 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_DE
Japan | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 133,758,799 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_JP | 123,884,470 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_JP | 100,422,507 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = country_JP
Other | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 498,936,232 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = gntx_OtherCountriesMember | $ 374,499,972 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = gntx_OtherCountriesMember | $ 355,160,210 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = gntx_AutomotiveProductsSegmentMember / us-gaap_StatementGeographicalAxis = gntx_OtherCountriesMember

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