Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue, Major Customer [Line Items]
Net sales	$ 221,666	$ 196,349	$ 434,922	$ 365,497
Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	(503)	(703)	(987)	(1,231)
United States
Revenue, Major Customer [Line Items]
Net sales	158,818	137,804	312,249	257,612
United States | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	(503)	(703)	(987)	(1,231)
Chinese
Revenue, Major Customer [Line Items]
Net sales	12,789	13,852	25,472	27,044
Chinese | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales		0	0	0
Mexico
Revenue, Major Customer [Line Items]
Net sales	9,418	10,751	17,632	21,356
Mexico | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales		0	0	0
Brazil
Revenue, Major Customer [Line Items]
Net sales	9,716	9,666	18,167	19,601
Brazil | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales		0	0	0
Germany
Revenue, Major Customer [Line Items]
Net sales	9,784	5,367	20,091	4,449
Germany | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales		0	0	0
Switzerland
Revenue, Major Customer [Line Items]
Net sales	4,687	3,043	9,328	3,990
Switzerland | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales		0	0	0
Poland | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales				0
Italy
Revenue, Major Customer [Line Items]
Net sales				6,909
Other Country
Revenue, Major Customer [Line Items]
Net sales	16,454	15,866	31,983	24,536
Other Country | Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales		0	0	0
Mobile Solutions | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	79,444	88,079	157,519	177,873
Mobile Solutions | United States | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	44,512	48,142	88,969	97,797
Mobile Solutions | Chinese | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	9,318	11,581	18,471	23,162
Mobile Solutions | Mexico | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	5,066	7,236	10,444	14,472
Mobile Solutions | Brazil | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	9,636	9,637	18,018	19,522
Mobile Solutions | Germany | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	1,316	1,551	2,722	3,085
Mobile Solutions | Switzerland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	1,153	1,294	2,512	2,700
Mobile Solutions | Poland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales				3,971
Mobile Solutions | Other Country | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	8,443	8,638	16,383	13,164
Power Solutions | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	51,393	49,820	101,050	98,502
Power Solutions | United States | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	40,580	41,924	81,695	82,052
Power Solutions | Chinese | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	1,598	959	3,436	2,444
Power Solutions | Mexico | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	4,235	3,348	6,944	6,545
Power Solutions | Brazil | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	80	0	149	50
Power Solutions | Germany | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	21	0	37	7
Power Solutions | Switzerland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	25	29	41	29
Power Solutions | Poland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales				18
Power Solutions | Other Country | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	4,854	3,560	8,748	7,357
Life Sciences | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	91,332	59,153	177,340	90,353
Life Sciences | United States | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	74,229	48,441	142,572	78,994
Life Sciences | Chinese | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	1,873	1,312	3,565	1,438
Life Sciences | Mexico | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	117	167	244	339
Life Sciences | Brazil | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	0	29	0	29
Life Sciences | Germany | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	8,447	3,816	17,332	3,817
Life Sciences | Switzerland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	3,509	1,720	6,775	1,720
Life Sciences | Poland | Operating Segments
Revenue, Major Customer [Line Items]
Net sales				1
Life Sciences | Other Country | Operating Segments
Revenue, Major Customer [Line Items]
Net sales	$ 3,157	$ 3,668	$ 6,852	$ 4,015