Segment Information - Continuing Operations by Reportable Segment (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Number of operating segments | segment	2
Segment Reporting Information [Line Items]
Net sales	$ 126,804	$ 116,213
Goodwill impairment	0	92,942
Income (loss) from operations	978	(103,850)
Interest expense	(2,024)	(3,807)
Other	(6,018)	(1,544)
Loss from continuing operations before benefit for income taxes and share of net income (loss) from joint venture	(7,064)	(109,201)
Operating Segments | Mobile Solutions
Segment Reporting Information [Line Items]
Net sales	77,776	69,884
Goodwill impairment		0
Income (loss) from operations	6,090	264
Operating Segments | Power Solutions
Segment Reporting Information [Line Items]
Net sales	49,075	46,401
Goodwill impairment		92,942
Income (loss) from operations	2,432	(90,334)
Corporate and Eliminations
Segment Reporting Information [Line Items]
Net sales	(47)	(72)
Goodwill impairment		0
Income (loss) from operations	$ (7,544)	$ (13,780)