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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 |

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