Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Net sales	$ 213,897	$ 205,683	$ 648,819	$ 571,180
Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	(615)	(567)	(1,602)	(1,798)
United States
Revenue, Major Customer [Line Items]
Net sales	157,711	147,780	469,960	405,392
United States | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	(615)	(567)	(1,602)	(1,798)
Chinese
Revenue, Major Customer [Line Items]
Net sales	12,569	15,212	38,041	42,256
Chinese | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Mexico
Revenue, Major Customer [Line Items]
Net sales	8,600	8,914	26,232	30,270
Mexico | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Brazil
Revenue, Major Customer [Line Items]
Net sales	9,486	8,307	27,653	27,908
Brazil | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Germany
Revenue, Major Customer [Line Items]
Net sales	8,289	8,753	28,380	7,777
Germany | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Switzerland
Revenue, Major Customer [Line Items]
Net sales	4,094	1,467	13,421	5,509
Switzerland | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Poland
Revenue, Major Customer [Line Items]
Net sales		3,328
Poland | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales		0		0
Italy
Revenue, Major Customer [Line Items]
Net sales				15,662
Other Country
Revenue, Major Customer [Line Items]
Net sales	13,148	11,922	45,132	36,406
Other Country | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Mobile Solutions | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	73,071	81,805	230,590	259,678
Mobile Solutions | United States | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	40,147	46,341	129,116	144,138
Mobile Solutions | Chinese | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	9,109	11,111	27,580	34,273
Mobile Solutions | Mexico | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	4,700	6,570	15,144	21,042
Mobile Solutions | Brazil | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	9,414	8,200	27,432	27,722
Mobile Solutions | Germany | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	1,768	1,415	4,490	4,500
Mobile Solutions | Switzerland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	1,094	1,420	3,606	3,915
Mobile Solutions | Poland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales		1,215		5,485
Mobile Solutions | Other Country | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	6,839	5,533	23,222	18,603
Power Solutions | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	47,430	46,082	148,480	144,584
Power Solutions | United States | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	38,750	38,137	120,445	120,189
Power Solutions | Chinese | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	1,870	1,696	5,306	4,140
Power Solutions | Mexico | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	3,832	2,254	10,776	8,799
Power Solutions | Brazil | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	72	107	221	157
Power Solutions | Germany | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	17	17	54	24
Power Solutions | Switzerland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	15	47	56	35
Power Solutions | Poland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales		6		23
Power Solutions | Other Country | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	2,874	3,818	11,622	11,217
Life Sciences | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	94,011	78,363	271,351	168,716
Life Sciences | United States | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	79,429	63,869	222,001	142,863
Life Sciences | Chinese | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	1,590	2,405	5,155	3,843
Life Sciences | Mexico | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	68	90	312	429
Life Sciences | Brazil | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	0	0	0	29
Life Sciences | Germany | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	6,504	7,321	23,836	11,138
Life Sciences | Switzerland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	2,985	0	9,759	3,827
Life Sciences | Poland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales		2,107		1
Life Sciences | Other Country | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	$ 3,435	$ 2,571	$ 10,288	$ 6,586