Revenue (Details) - USD ($)	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 453,409,000	$ 460,253,000	$ 454,981,000	$ 465,420,000	$ 459,570,000	$ 438,628,000	$ 443,139,000	$ 453,535,000		$ 1,834,063,697	$ 1,794,872,578	$ 1,678,924,756
Automotive Segment
Disaggregation of Revenue [Line Items]
Revenues										1,791,198,296	1,758,127,468
Other
Disaggregation of Revenue [Line Items]
Revenues										42,865,401	36,745,110
Automotive Products
Disaggregation of Revenue [Line Items]
Revenues										1,791,198,296	1,758,127,468
Automotive Mirrors & Electronics | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenues										1,598,589,777	1,573,222,820
Automotive Mirrors & Electronics | Automotive Segment | Minimum
Disaggregation of Revenue [Line Items]
Payment terms									15 days
Automotive Mirrors & Electronics | Automotive Segment | Maximum
Disaggregation of Revenue [Line Items]
Payment terms									90 days
HomeLink Modules | Automotive Segment
Disaggregation of Revenue [Line Items]
Revenues										192,608,519	184,904,648
Other Products (U.S.) | Other
Disaggregation of Revenue [Line Items]
Revenues										42,865,401	36,745,110	$ 39,232,513
Fire Protection Products | Other
Disaggregation of Revenue [Line Items]
Revenues										22,109,784	18,790,474
Fire Protection Products | Other | Minimum
Disaggregation of Revenue [Line Items]
Payment terms									30 days
Fire Protection Products | Other | Maximum
Disaggregation of Revenue [Line Items]
Payment terms									75 days
Windows Products | Other
Disaggregation of Revenue [Line Items]
Revenues										20,755,617	17,954,636
Dimmable Aircraft Windows | Other | Minimum
Disaggregation of Revenue [Line Items]
Payment terms									30 days
Dimmable Aircraft Windows | Other | Maximum
Disaggregation of Revenue [Line Items]
Payment terms									45 days
U.S. | Automotive Products
Disaggregation of Revenue [Line Items]
Revenues										583,672,971	567,492,812
U.S. | Other Products (U.S.)
Disaggregation of Revenue [Line Items]
Revenues										42,865,401	36,745,110
Germany | Automotive Products
Disaggregation of Revenue [Line Items]
Revenues										333,002,878	351,123,204
Japan | Automotive Products
Disaggregation of Revenue [Line Items]
Revenues										209,311,790	185,261,067
Other | Automotive Products
Disaggregation of Revenue [Line Items]
Revenues										$ 665,210,657	$ 654,250,385