Segment Information - (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Reportable segments | segment		3
Operating segments | segment		3
Net sales	$ 427,534	$ 489,514	$ 524,194
Depreciation and amortization	45,680	44,896	43,026
Goodwill impairment	92,942	0	182,542
Income (loss) from operations	(117,457)	(17,593)	(195,047)
Interest expense	(18,898)	(13,030)	(11,315)
Other	(15,733)	(1,502)	(2,016)
Loss from continuing operations before benefit (provision) for income taxes and share of net income (loss) from joint venture	(152,088)	(32,125)	(208,378)
Share of net income (loss) from joint venture	3,626	1,681	(14,390)
Expenditures for long-lived assets	15,357	32,169	49,277
Total assets	624,962	1,541,984
Life Sciences | Discontinued Operations, Disposed of by Sale
Segment Reporting Information [Line Items]
Interest expense	(48,893)	(44,125)	(49,928)
Corporate And Eliminations
Segment Reporting Information [Line Items]
Goodwill impairment	0		0
Mobile Solutions | Operating Segments
Segment Reporting Information [Line Items]
Net sales	256,360	297,749	335,037
Depreciation and amortization	28,298	27,146	26,217
Goodwill impairment	0		73,442
Income (loss) from operations	5,228	9,553	(55,079)
Share of net income (loss) from joint venture	3,626	1,681	(14,390)
Expenditures for long-lived assets	12,400	24,969	36,660
Total assets	370,985	373,256
Power Solutions | Operating Segments
Segment Reporting Information [Line Items]
Net sales	171,269	192,100	189,778
Depreciation and amortization	15,730	15,301	14,753
Goodwill impairment	92,942		109,100
Income (loss) from operations	(85,983)	13,881	(95,115)
Share of net income (loss) from joint venture	0	0	0
Expenditures for long-lived assets	2,754	4,457	6,459
Total assets	197,348	310,545
Corporate and Consolidations | Corporate And Eliminations
Segment Reporting Information [Line Items]
Net sales	(95)	(335)	(621)
Depreciation and amortization	1,652	2,449	2,056
Income (loss) from operations	(36,702)	(41,027)	(44,853)
Share of net income (loss) from joint venture	0	0	0
Expenditures for long-lived assets	203	2,743	$ 6,158
Total assets	$ 56,629	858,183
Corporate and Consolidations | Corporate And Eliminations | Life Sciences | Discontinued Operations, Disposed of by Sale
Segment Reporting Information [Line Items]
Total assets		812,100
Wuxi Weifu Autocam Precision Machinery Company, Ltd.
Segment Reporting Information [Line Items]
Investment in joint venture	49.00%
Wuxi Weifu Autocam Precision Machinery Company, Ltd. | Mobile Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total assets	$ 27,000	$ 21,800