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Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Intangible assets, net $ 317,925,000 $ 327,575,000 [1]
Gentex Patents    
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 32,227,694 31,873,665
Finite-lived intangible assets, accumulated amortization (15,183,694) (13,890,202)
Finite-lived intangible assets, net 17,044,000 17,983,463
Patents and Other Intangible Assets    
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, accumulated amortization (68,258,694) (57,315,202)
Intangible assets, gross 403,227,694 402,873,665
Intangible assets, net 334,969,000 345,558,463
HomeLink®    
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, accumulated amortization (53,075,000) (43,425,000)
Intangible assets, gross 371,000,000 371,000,000
Intangible assets, net 317,925,000 327,575,000
HomeLink® | Homelink Technology    
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 180,000,000 180,000,000
Finite-lived intangible assets, accumulated amortization (41,250,000) (33,750,000)
Finite-lived intangible assets, net $ 138,750,000 $ 146,250,000
HomeLink® | Homelink Technology | Minimum [Member]    
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Finite-lived intangible asset, useful life 12 years 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 $ 43,000,000
Finite-lived intangible assets, accumulated amortization (11,825,000) (9,675,000)
Finite-lived intangible assets, net $ 31,175,000 $ 33,325,000
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 $ 52,000,000
HomeLink® | Exclusive Licensing Agreement    
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 96,000,000 $ 96,000,000
[1] Note: The condensed consolidated balance sheet at December 31, 2015 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.