Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 477,761,417	$ 460,253,433	$ 1,415,061,768	$ 1,380,654,978
Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	464,280,707	449,184,447	1,376,704,413	1,348,395,245
Other Segment
Disaggregation of Revenue [Line Items]
Revenue	13,480,710	11,068,986	38,357,355	32,259,733
Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	464,280,707	449,184,447	1,376,704,413	1,348,395,245
Automotive Mirrors & Electronics | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	418,746,334	399,732,577	1,241,147,268	1,200,521,589
HomeLink Modules | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	45,534,373	49,451,870	135,557,145	147,873,656
Fire Protection Products | Other Segment
Disaggregation of Revenue [Line Items]
Revenue	5,977,245	5,918,085	18,188,744	17,010,954
Windows Products | Other Segment
Disaggregation of Revenue [Line Items]
Revenue	7,503,465	5,150,901	20,168,611	15,248,779
U.S. | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	145,798,028	151,229,829	431,729,037	434,439,455
U.S. | Other Products
Disaggregation of Revenue [Line Items]
Revenue	13,480,710	11,068,986	38,357,355	32,259,733
Germany | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	74,047,596	81,621,623	225,649,215	259,057,369
Japan | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	60,641,977	55,363,644	172,697,963	153,843,723
Mexico | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	43,884,609	28,410,998	130,473,702	73,868,425
Other | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	$ 139,908,497	$ 132,558,353	$ 416,154,496	$ 427,186,273