Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 468,711,354	$ 454,981,440	$ 937,300,351	$ 920,401,545
Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	456,625,064	444,245,425	912,423,707	899,210,799
Other Segment
Disaggregation of Revenue [Line Items]
Revenue	12,086,290	10,736,015	24,876,644	21,190,746
Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	456,625,064	444,245,425	912,423,707	899,210,799
Automotive Mirrors & Electronics | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	413,429,267	396,547,385	822,400,934	800,789,013
HomeLink Modules | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenue	43,195,797	47,698,040	90,022,773	98,421,786
Fire Protection Products | Other Segment
Disaggregation of Revenue [Line Items]
Revenue	6,359,266	5,813,210	12,211,499	11,092,868
Windows Products | Other Segment
Disaggregation of Revenue [Line Items]
Revenue	5,727,024	4,922,805	12,665,145	10,097,878
U.S. | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	144,547,946	142,896,639	285,931,010	283,209,626
U.S. | Other Products
Disaggregation of Revenue [Line Items]
Revenue	12,086,290	10,736,015	24,876,644	21,190,746
Germany | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	73,151,692	85,642,205	151,601,619	177,435,746
Japan | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	55,722,292	48,647,082	112,055,986	98,480,079
Mexico | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	42,178,705	22,358,617	86,589,093	45,457,427
Other | Automotive Products
Disaggregation of Revenue [Line Items]
Revenue	$ 141,024,429	$ 144,700,882	$ 276,245,999	$ 294,627,921