Stock-Based Compensation Plans - Narrative (Details)		1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2022 shares	May 31, 2022 shares	Sep. 30, 2023 USD ($) plan shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) plan shares	Sep. 30, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments | $			$ 10,948,031	$ 7,611,546	$ 29,212,236	$ 22,973,113
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%
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 | $			$ 2,463,158	308,812	$ 4,600,386	1,431,018
Unrecognized compensation cost | $			18,288,329		18,288,329
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments | $			$ 441,115		$ 1,082,333
Option vesting period					4 years
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grants in period (in shares)					9,733,895
Shares issued under the omnibus plan (in shares)					24,797,549
Number of shares authorized (in shares)			45,000,000		45,000,000
Omnibus Incentive Plan | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the omnibus plan (in shares)					3,515,440
Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost | $			$ 8,461,373		$ 8,461,373
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 | $			46,555,320		$ 46,555,320
Restricted period, maximum					10 years
Amortization expense | $			$ 6,369,348	$ 5,504,462	$ 18,178,157	$ 16,130,339
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)					250,369
Number of shares authorized (in shares)		2,000,000
ESPP discount rate		85.00%
ESPP discount rate recognized as compensation expense		15.00%