Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 225,399	$ 225,010	$ 711,753	$ 674,135
Gross Profit	31,204	32,177	99,546	98,585
Selling, General & Administrative Expenses	17,531	15,613	48,976	45,177
Amortization Expense	437	321	1,080	980
Operating Income	13,236	16,243	49,490	52,428
Capital and Other Expenditures [Abstract]
Capital Expenditures	6,197	4,664	18,915	9,823
Depreciation Expense	3,482	6,861	9,896	10,807
Operating Segments
Segment Reporting Information [Line Items]
Revenues	225,399	225,010	711,753	674,135
Corporate/ Other
Segment Reporting Information [Line Items]
Revenues	(1,762)	(4,169)	(10,303)	(9,820)
Gross Profit	(59)	(30)	(166)	(525)
Selling, General & Administrative Expenses	8,458	6,131	21,563	16,984
Amortization Expense	0	0	0	0
Operating Income	(8,517)	(6,161)	(21,729)	(17,509)
Capital and Other Expenditures [Abstract]
Capital Expenditures	661	281	2,274	1,514
Depreciation Expense	670	3,718	1,940	2,030
Electrical Systems
Segment Reporting Information [Line Items]
Revenues	131,442	128,216	417,000	385,704
Electrical Systems \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	129,710	125,220	409,471	378,649
Gross Profit	18,932	18,304	58,915	57,598
Selling, General & Administrative Expenses	4,030	3,790	11,855	11,323
Amortization Expense	303	186	676	559
Operating Income	14,599	14,328	46,384	45,716
Capital and Other Expenditures [Abstract]
Capital Expenditures	4,472	3,155	13,794	6,011
Depreciation Expense	1,771	1,723	4,770	5,203
Electrical Systems \| Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	1,732	2,996	7,529	7,055
Global Seating
Segment Reporting Information [Line Items]
Revenues	95,719	100,963	305,056	298,251
Global Seating \| Operating Segments
Segment Reporting Information [Line Items]
Revenues	95,689	99,790	302,282	295,486
Gross Profit	12,331	13,903	40,797	41,512
Selling, General & Administrative Expenses	5,043	5,692	15,558	16,870
Amortization Expense	134	135	404	421
Operating Income	7,154	8,076	24,835	24,221
Capital and Other Expenditures [Abstract]
Capital Expenditures	1,064	1,228	2,847	2,298
Depreciation Expense	1,041	1,420	3,186	3,574
Global Seating \| Intersegment Revenues
Segment Reporting Information [Line Items]
Revenues	$ 30	$ 1,173	$ 2,774	$ 2,765

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