Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Capitalized Contract Cost [Line Items]
Revenues	$ 257,941	$ 126,896	$ 503,063	$ 314,001
Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(2,061)	(1,176)	(10,275)	(2,149)
Seats
Capitalized Contract Cost [Line Items]
Revenues	83,084	51,347	165,230	124,516
Seats | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(1,216)	(452)	(8,505)	(514)
Electrical wire harnesses, panels and assemblies
Capitalized Contract Cost [Line Items]
Revenues	101,036	48,121	195,392	102,749
Electrical wire harnesses, panels and assemblies | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(276)	(40)	(652)	(97)
Trim
Capitalized Contract Cost [Line Items]
Revenues	40,326	13,830	77,363	45,742
Trim | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(500)	(532)	(921)	(1,047)
Cab structures and sleeper boxes
Capitalized Contract Cost [Line Items]
Revenues	21,669	5,731	42,326	20,431
Cab structures and sleeper boxes | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	0	0	0	0
Mirrors, wipers and controls
Capitalized Contract Cost [Line Items]
Revenues	11,826	7,867	22,752	20,563
Mirrors, wipers and controls | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(69)	(152)	(197)	(491)
Electrical Systems
Capitalized Contract Cost [Line Items]
Revenues	174,104	73,498	333,792	184,665
Electrical Systems | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	175,104	74,210	337,346	186,308
Electrical Systems | Seats | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	756	377	3,199	744
Electrical Systems | Electrical wire harnesses, panels and assemblies | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	100,244	47,822	191,096	102,099
Electrical Systems | Trim | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	40,826	12,917	78,212	43,426
Electrical Systems | Cab structures and sleeper boxes | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	21,669	5,731	42,326	20,431
Electrical Systems | Mirrors, wipers and controls | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	11,609	7,363	22,513	19,608
Global Seating
Capitalized Contract Cost [Line Items]
Revenues	83,837	53,398	169,271	129,336
Global Seating | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	84,898	53,862	175,992	129,842
Global Seating | Seats | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	83,544	51,422	170,536	124,286
Global Seating | Electrical wire harnesses, panels and assemblies | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	1,068	339	4,948	747
Global Seating | Trim | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	0	1,445	72	3,363
Global Seating | Cab structures and sleeper boxes | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	0	0	0	0
Global Seating | Mirrors, wipers and controls | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	$ 286	$ 656	$ 436	$ 1,446