Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 239,610	$ 187,697	$ 742,673	$ 501,698
Gross profit	30,144	24,159	95,633	50,937
Selling, general & administrative expenses	18,772	15,266	52,529	50,066
Goodwill and other impairment	0	0	0	29,017
Operating income (loss)	11,372	8,893	43,104	(28,146)
Corporate/ Other
Segment Reporting Information [Line Items]
Revenues	(992)	(2,272)	(11,267)	(4,422)
Gross profit	(2)	(377)	(43)	(404)
Selling, general & administrative expenses	6,833	7,725	19,008	21,803
Goodwill and other impairment				793
Operating income (loss)	(6,835)	(8,102)	(19,051)	(23,000)
Electrical Systems
Segment Reporting Information [Line Items]
Revenues	163,134	120,723	496,926	305,389
Electrical Systems | Intersegment revenues
Segment Reporting Information [Line Items]
Revenues	978	344	4,532	1,987
Electrical Systems | Operating Segments
Segment Reporting Information [Line Items]
Revenues	164,112	121,067	501,458	307,376
Gross profit	23,662	16,118	67,710	28,208
Selling, general & administrative expenses	5,878	3,895	16,505	15,884
Goodwill and other impairment				23,415
Operating income (loss)	17,784	12,223	51,205	(11,091)
Global Seating
Segment Reporting Information [Line Items]
Revenues	76,476	66,974	245,747	196,309
Global Seating | Intersegment revenues
Segment Reporting Information [Line Items]
Revenues	14	1,928	6,735	2,435
Global Seating | Operating Segments
Segment Reporting Information [Line Items]
Revenues	76,490	68,902	252,482	198,744
Gross profit	6,484	8,418	27,966	23,133
Selling, general & administrative expenses	6,061	3,646	17,016	12,379
Goodwill and other impairment				4,809
Operating income (loss)	$ 423	$ 4,772	$ 10,950	$ 5,945