Stock-Based Compensation Plans - Narrative (Details)		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2022 shares	May 31, 2022 shares	Jun. 30, 2024 USD ($) plan shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) plan shares	Jun. 30, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments | $			$ 10,964,419	$ 9,744,670	$ 21,451,680	$ 18,264,205
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the omnibus plan (in shares)					1,624,122
Number of shares authorized (in shares)	2,000,000
ESPP discount rate	85.00%
ESPP discount rate recognized as compensation expense	15.00%
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grants in period (in shares)					10,767,342
Shares issued under the omnibus plan (in shares)					28,493,236
Number of shares authorized (in shares)			45,000,000		45,000,000
Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost | $			$ 6,433,486		$ 6,433,486
Employee Stock Option Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period					1 year
Option expiration period					5 years
Employee Stock Option Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting period					5 years
Option expiration period					10 years
Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost | $			51,380,007		$ 51,380,007
Restricted period, maximum					10 years
Amortization expense | $			$ 6,883,839	5,862,755	$ 13,571,180	11,808,809
Gentex Corporation Employee Stock Purchase Plan | Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the omnibus plan (in shares)					362,488
Number of shares authorized (in shares)		2,000,000
ESPP discount rate		85.00%
ESPP discount rate recognized as compensation expense		15.00%
Equity Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | plan			2		2
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments | $			$ 2,023,635	1,635,022	$ 3,796,264	2,137,228
Unrecognized compensation cost | $			18,244,290		$ 18,244,290
Performance Shares | Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the omnibus plan (in shares)					4,093,036
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments | $			$ 445,793	$ 516,493	$ 888,639	$ 641,218
Option vesting period					4 years