Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Capitalized Contract Cost [Line Items]
Revenues	$ 239,610	$ 187,697	$ 742,673	$ 501,698
Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(992)	(2,272)	(11,267)	(4,422)
Seats
Capitalized Contract Cost [Line Items]
Revenues	75,818	64,200	241,048	188,621
Seats | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(288)	(1,946)	(8,793)	(2,460)
Electrical wire harnesses, panels and assemblies
Capitalized Contract Cost [Line Items]
Revenues	94,326	67,237	289,719	170,074
Electrical wire harnesses, panels and assemblies | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(159)	(111)	(810)	(216)
Trim
Capitalized Contract Cost [Line Items]
Revenues	39,806	34,478	117,168	80,227
Trim | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(446)	(73)	(1,368)	(1,113)
Cab structures and sleeper boxes
Capitalized Contract Cost [Line Items]
Revenues	18,625	12,479	60,952	32,910
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	11,035	9,303	33,786	29,866
Mirrors, wipers and controls | Elimination/ Other
Capitalized Contract Cost [Line Items]
Revenues	(99)	(142)	(296)	(633)
Electrical Systems
Capitalized Contract Cost [Line Items]
Revenues	163,134	120,723	496,926	305,389
Electrical Systems | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	164,112	121,067	501,458	307,376
Electrical Systems | Seats | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	667	344	3,866	993
Electrical Systems | Electrical wire harnesses, panels and assemblies | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	93,895	65,791	284,991	167,986
Electrical Systems | Trim | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	40,174	33,364	118,386	76,790
Electrical Systems | Cab structures and sleeper boxes | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	18,625	12,479	60,952	32,910
Electrical Systems | Mirrors, wipers and controls | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	10,751	9,089	33,263	28,697
Global Seating
Capitalized Contract Cost [Line Items]
Revenues	76,476	66,974	245,747	196,309
Global Seating | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	76,490	68,902	252,482	198,744
Global Seating | Seats | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	75,439	65,802	245,975	190,088
Global Seating | Electrical wire harnesses, panels and assemblies | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	590	1,557	5,538	2,304
Global Seating | Trim | Operating Segments
Capitalized Contract Cost [Line Items]
Revenues	78	1,187	150	4,550
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	$ 383	$ 356	$ 819	$ 1,802