XML 63 R48.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Segment Reporting (Schedule of Automotive and Other Segment Reporting) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 405,593,000 | $ 389,829,000 | $ 379,258,000 | $ 368,937,000 | $ 350,411,000 | $ 350,914,000 | $ 338,437,000 | $ 335,739,000 | $ 1,543,617,706 | $ 1,375,501,159 | $ 1,171,864,171
Income (Loss) from Operations | 126,662,000 | $ 116,263,000 | $ 108,133,000 | $ 107,709,000 | 98,615,000 | $ 103,206,000 | $ 99,835,000 | $ 97,178,000 | 458,766,439 | 398,834,174 | 304,741,813
Assets | 2,148,672,928 |  |  |  | 2,022,540,029 |  |  |  | 2,148,672,928 | 2,022,540,029 | 1,764,088,434
Depreciation & Amortization |  |  |  |  |  |  |  |  | 80,599,167 | 77,376,305 | 62,854,155
Capital Expenditures |  |  |  |  |  |  |  |  | 97,941,762 | 72,518,987 | 55,380,457
Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,506,872,004 | 1,340,122,274 | 1,143,988,127
Income (Loss) from Operations |  |  |  |  |  |  |  |  | 445,067,511 | 386,762,986 | 298,465,299
Assets | 1,414,426,679 |  |  |  | 1,333,615,389 |  |  |  | 1,414,426,679 | 1,333,615,389 | 1,290,801,674
Depreciation & Amortization |  |  |  |  |  |  |  |  | 78,925,332 | 75,320,999 | 58,723,222
Capital Expenditures |  |  |  |  |  |  |  |  | 97,632,519 | 71,032,115 | 54,020,792
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,745,702 | 35,378,885 | 27,876,044
Income (Loss) from Operations |  |  |  |  |  |  |  |  | 13,698,928 | 12,071,188 | 6,276,514
Assets | 9,429,994 |  |  |  | 8,841,958 |  |  |  | 9,429,994 | 8,841,958 | 9,001,278
Depreciation & Amortization |  |  |  |  |  |  |  |  | 306,908 | 321,426 | 316,836
Capital Expenditures |  |  |  |  |  |  |  |  | 161,247 | 145,704 | 301,697
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | $ 724,816,255 |  |  |  | $ 680,082,682 |  |  |  | 724,816,255 | 680,082,682 | 464,285,482
Depreciation & Amortization |  |  |  |  |  |  |  |  | 1,366,927 | 1,733,880 | 3,814,097
Capital Expenditures |  |  |  |  |  |  |  |  | 147,996 | 1,341,168 | 1,057,968
United States | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 494,876,354 | 444,921,897 | 400,654,021
Germany | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 295,044,988 | 262,505,346 | 244,949,664
Japan | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 148,632,237 | 133,758,799 | 123,884,470
Other | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 568,318,425 | $ 498,936,232 | $ 374,499,972

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.18) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueGoodsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=gntx_AutomotiveProductsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=gntx_OtherSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_DE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_JP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=gntx_OtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |