Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 243,190	$ 233,391	$ 486,354	$ 449,126
Gross Profit	33,783	35,585	68,343	66,408
Selling, General & Administrative Expenses	16,248	14,349	31,446	29,564
Amortization Expense	322	327	643	659
Operating Income	17,213	20,909	36,254	36,185
Capital and Other Expenditures [Abstract]
Capital Expenditures	7,416	3,392	12,718	5,158
Depreciation Expense	3,020	3,608	6,415	7,089
Operating Segments
Segment Reporting Information [Line Items]
Revenues	243,190	233,391	486,354	449,126
Corporate/ Other
Segment Reporting Information [Line Items]
Revenues	(4,033)	(3,342)	(8,541)	(5,651)
Gross Profit	(48)	(243)	(108)	(495)
Selling, General & Administrative Expenses	7,395	5,061	13,106	10,853
Amortization Expense	0	0	0	0
Operating Income	(7,443)	(5,304)	(13,214)	(11,348)
Capital and Other Expenditures [Abstract]
Capital Expenditures	773	1,111	1,613	1,231
Depreciation Expense	638	787	1,270	1,456
Electrical Systems
Segment Reporting Information [Line Items]
Revenues	141,947	134,561	285,558	257,489
Electrical Systems \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	139,089	132,311	279,761	253,430
Gross Profit	19,145	21,340	39,985	39,294
Selling, General & Administrative Expenses	3,676	3,760	7,825	7,533
Amortization Expense	186	186	373	373
Operating Income	15,283	17,394	31,787	31,388
Capital and Other Expenditures [Abstract]
Capital Expenditures	5,837	1,646	9,322	2,856
Depreciation Expense	1,317	1,728	2,999	3,479
Electrical Systems \| Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	2,858	2,250	5,797	4,059
Global Seating
Segment Reporting Information [Line Items]
Revenues	105,276	102,172	209,337	197,288
Global Seating \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	104,101	101,080	206,593	195,696
Gross Profit	14,686	14,488	28,466	27,609
Selling, General & Administrative Expenses	5,177	5,528	10,515	11,178
Amortization Expense	136	141	270	286
Operating Income	9,373	8,819	17,681	16,145
Capital and Other Expenditures [Abstract]
Capital Expenditures	806	635	1,783	1,071
Depreciation Expense	1,065	1,093	2,146	2,154
Global Seating \| Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	$ 1,175	$ 1,092	$ 2,744	$ 1,592

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