Segment Information - (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Net sales	$ 498,738	$ 477,584	$ 427,534
Operating Income (Loss)	(21,092)	(9,004)	(117,457)
Depreciation and amortization	47,231	46,195	45,680
Expenditures for long-lived assets	17,952	18,221	23,773
Assets	546,127	579,101
Investment in joint venture	$ 31,802	34,045
Operating segments | segment	2
Continuing Operations
Segment Reporting Information [Line Items]
Expenditures for long-lived assets			15,357
United States
Segment Reporting Information [Line Items]
Net sales	$ 301,823	293,235	268,551
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(2)	(79)	(95)
Assets	29,660	37,734
Intersegment Eliminations [Member] | United States
Segment Reporting Information [Line Items]
Net sales	(2)	(79)	(95)
Mobile Solutions | Operating Segments
Segment Reporting Information [Line Items]
Net sales	293,536	285,863	256,360
Operating Income (Loss)	(2,165)	9,039	5,228
Depreciation and amortization	28,192	28,769	28,298
Expenditures for long-lived assets	14,590	15,411	12,400
Assets	338,338	357,171
Mobile Solutions | Operating Segments | United States
Segment Reporting Information [Line Items]
Net sales	140,931	140,383	129,147
Power Solutions | Operating Segments
Segment Reporting Information [Line Items]
Net sales	205,204	191,800	171,269
Operating Income (Loss)	3,536	6,493	(85,983)
Depreciation and amortization	17,483	15,892	15,730
Expenditures for long-lived assets	2,401	2,200	2,754
Assets	178,129	184,196
Power Solutions | Operating Segments | United States
Segment Reporting Information [Line Items]
Net sales	160,894	152,931	139,499
Corporate And Eliminations | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(22,463)	(24,536)	(36,702)
Depreciation and amortization	1,556	1,534	1,652
Expenditures for long-lived assets	$ 961	$ 610	$ 203