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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, 2022 USD ($) plan shares | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) plan shares | Sep. 30, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense for share-based payments | $ |  |  | $ 7,611,545 | $ 7,492,763 | $ 22,973,113 | $ 20,114,921
Employee Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued under the Omnibus plan |  |  |  |  | 1,624,122 |
Number of shares authorized | 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) |  |  |  |  | 7,994,761 |
Shares issued under the Omnibus plan |  |  |  |  | 19,523,865 |
Number of shares authorized |  |  | 45,000,000 |  | 45,000,000 |
Employee Stock Option Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  | $ 9,723,678 |  | $ 9,723,678 |
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 | $ |  |  | 45,827,137 |  | $ 45,827,137 |
Restricted period, maximum |  |  |  |  | 10 years |
Amortization expense | $ |  |  | $ (5,504,462) | $ (5,215,981) | $ (16,130,339) | $ (13,978,358)
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 |  |  |  |  | 54,977 |
Number of shares authorized |  | 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] |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  | $ 8,480,588 |  | $ 8,480,588 |
Performance Shares | Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued under the Omnibus plan |  |  |  |  | 2,271,456 |

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