Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total Revenue	$ 657,858,210	$ 572,925,778	$ 1,234,631,300	$ 1,163,150,989
Automotive Products
Disaggregation of Revenue [Line Items]
Total Revenue	578,129,026	559,290,095	1,141,993,285	1,136,892,291
Automotive Products \| U.S.
Disaggregation of Revenue [Line Items]
Total Revenue	172,204,462	164,948,637	335,585,400	330,089,259
Automotive Products \| Japan
Disaggregation of Revenue [Line Items]
Total Revenue	96,094,581	82,261,793	194,459,984	171,266,421
Automotive Products \| Germany
Disaggregation of Revenue [Line Items]
Total Revenue	67,662,895	71,510,830	132,680,756	147,205,718
Automotive Products \| Korea
Disaggregation of Revenue [Line Items]
Total Revenue	56,610,947	31,457,450	94,806,280	85,152,562
Automotive Products \| Mexico
Disaggregation of Revenue [Line Items]
Total Revenue	45,702,656	47,955,922	93,351,532	85,577,085
Automotive Products \| China
Disaggregation of Revenue [Line Items]
Total Revenue	35,081,549	50,952,480	76,035,949	98,301,934
Automotive Products \| Other
Disaggregation of Revenue [Line Items]
Total Revenue	104,771,936	110,202,983	215,073,384	219,299,312
Automotive Mirrors & Electronics
Disaggregation of Revenue [Line Items]
Total Revenue	548,897,948	530,558,700	1,079,029,377	1,080,743,130
HomeLink Modules
Disaggregation of Revenue [Line Items]
Total Revenue	29,231,078	28,731,395	62,963,908	56,149,161
Premium Audio Products
Disaggregation of Revenue [Line Items]
Total Revenue	44,490,597	0	44,490,597	0
Premium Audio Products \| U.S.
Disaggregation of Revenue [Line Items]
Total Revenue	29,933,112	0	29,933,112	0
Premium Audio Products \| Other
Disaggregation of Revenue [Line Items]
Total Revenue	14,557,485	0	14,557,485	0
Premium Speaker Products
Disaggregation of Revenue [Line Items]
Total Revenue	32,430,491	0	32,430,491	0
Premium Receiver Products
Disaggregation of Revenue [Line Items]
Total Revenue	12,060,106	0	12,060,106	0
Other
Disaggregation of Revenue [Line Items]
Total Revenue	35,238,587	13,635,683	48,147,418	26,258,698
Fire Protection Products
Disaggregation of Revenue [Line Items]
Total Revenue	8,082,207	7,353,664	14,799,977	14,189,702
Windows Products
Disaggregation of Revenue [Line Items]
Total Revenue	3,996,515	6,286,593	8,887,501	12,057,394
Medical Products
Disaggregation of Revenue [Line Items]
Total Revenue	245,421	(4,574)	632,256	11,602
Aftermarket Products
Disaggregation of Revenue [Line Items]
Total Revenue	15,223,080	0	15,223,080	0
Consumer Electronic Products
Disaggregation of Revenue [Line Items]
Total Revenue	7,477,039	0	7,477,039	0
Biometric Products
Disaggregation of Revenue [Line Items]
Total Revenue	$ 214,325	$ 0	$ 1,127,565	$ 0

GENTEX CORP 10-Q