Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 468,588,997	$ 465,420,105
Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	455,798,643	454,965,374
Other Segment
Disaggregation of Revenue [Line Items]
Revenue	12,790,354	10,454,731
Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	455,798,643	454,965,374
Automotive Mirrors & Electronics | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	408,971,666	404,241,628
HomeLink Modules | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	46,826,977	50,723,746
Fire Protection Products | Other Segment
Disaggregation of Revenue [Line Items]
Revenue	5,852,232	5,279,658
Windows Products | Other Segment
Disaggregation of Revenue [Line Items]
Revenue	6,938,122	5,175,073
U.S. | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	141,383,064	140,312,987
U.S. | Other Products
Disaggregation of Revenue [Line Items]
Revenue	12,790,354	10,454,731
Germany | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	78,449,927	91,793,541
Japan | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	56,333,694	49,832,997
Mexico | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	44,410,388	23,098,810
Other | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	$ 135,221,570	$ 149,927,039