STOCK-BASED COMPENSATION PLANS - Narrative (Details)	1 Months Ended	12 Months Ended
	May 31, 2022 shares	Dec. 31, 2024 USD ($) plan shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Jun. 30, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period		2 years 4 months 24 days	2 years 10 months 24 days	3 years 1 month 6 days
Granted (in shares)		1,189,000	1,027,000	949,000
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved (in shares)		45,000,000
Shares issued under plan (in shares)		30,663,754
Awards granted net of shares from canceled/expired options (in shares)		5,044,379
Maximum restricted period		10 years
Granted (in shares)		5,290,546
Shares outstanding (in shares)		3,174,624
Employee Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved (in shares)		24,000,000
Awards granted net of shares from canceled/expired options (in shares)		12,674,639
Unrecognized compensation cost | $		$ 5,022,501
Weighted-average period for unrecognized compensation cost expected to be recognized		1 year 3 months 25 days
Employee Stock Option Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Award expiration period		5 years
Employee Stock Option Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		5 years
Award expiration period		10 years
Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved (in shares)		9,000,000
Unrecognized compensation cost | $		$ 53,315,524
Granted (in shares)		5,630,019
Restricted compensation expense | $		$ 25,819,690	$ 24,809,834	$ 21,773,179
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | plan		2
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | plan		2
Stock option expense | $		$ 5,070,620	6,095,854	6,302,581
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost | $		11,767,729
Stock option expense | $		$ 5,884,030	5,882,458	1,246,369
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Stock option expense | $		$ 1,800,429	1,526,983
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | plan		2
Shares approved (in shares)					2,000,000
Employee Stock Purchase Plan | Gentex Corporation Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved (in shares)	2,000,000
Stock option expense | $		$ 964,594	$ 882,294	$ 906,478
ESPP discount rate	85.00%
Discount recognized as compensation expense	15.00%