STOCK-BASED COMPENSATION PLANS - Schedule of Vested Restricted Stocks (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 23	$ 32	$ 30
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	1,348,230	1,159,866	1,000,064
Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 21.99	$ 28.73	$ 28.03
Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 28.30	$ 36.12	$ 32.66
Restricted Stock \| 1 Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	214,339	154,023	142,314
Restricted Stock \| 1 Year \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 21.99	$ 28.73	$ 28.03
Restricted Stock \| 1 Year \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 28.30	$ 36.12	$ 32.66
Restricted Stock \| 2 Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	166,839	127,778	104,562
Restricted Stock \| 2 Year \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 21.99	$ 28.73	$ 28.03
Restricted Stock \| 2 Year \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 28.30	$ 36.12	$ 32.66
Restricted Stock \| 3 Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	304,443	360,782	302,569
Restricted Stock \| 3 Years \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 21.99	$ 28.73	$ 28.03
Restricted Stock \| 3 Years \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 28.30	$ 36.12	$ 32.66
Restricted Stock \| 4 Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	365,595	303,563	265,719
Restricted Stock \| 4 Years \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 21.99	$ 28.73	$ 28.03
Restricted Stock \| 4 Years \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 28.30	$ 36.12	$ 32.66
Restricted Stock \| 5 Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	297,014	213,720	184,900
Restricted Stock \| 5 Years \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 21.99	$ 28.73	$ 28.03
Restricted Stock \| 5 Years \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price at grant date (in dollars per share)	$ 28.30	$ 36.12	$ 32.66

GENTEX CORP 10-K