Revenue from Contracts with Customers - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue, Major Customer [Line Items]
Net sales	$ 113,761	$ 120,459	$ 308,506	$ 378,838
United States and Puerto Rico
Revenue, Major Customer [Line Items]
Net sales	72,390	78,855	198,844	249,329
China
Revenue, Major Customer [Line Items]
Net sales	14,365	10,979	35,192	32,886
Brazil
Revenue, Major Customer [Line Items]
Net sales	7,353	9,486	18,261	27,653
Mexico
Revenue, Major Customer [Line Items]
Net sales	7,693	8,532	21,247	25,920
Germany
Revenue, Major Customer [Line Items]
Net sales	1,532	1,785	4,662	4,544
Poland
Revenue, Major Customer [Line Items]
Net sales	1,346	1,376	3,452	4,882
Other
Revenue, Major Customer [Line Items]
Net sales	9,082	9,446	26,848	33,624
Operating Segments | Mobile Solutions
Revenue, Major Customer [Line Items]
Net sales	70,371	73,071	181,292	230,590
Operating Segments | Mobile Solutions | United States and Puerto Rico
Revenue, Major Customer [Line Items]
Net sales	37,116	40,147	94,482	129,116
Operating Segments | Mobile Solutions | China
Revenue, Major Customer [Line Items]
Net sales	12,785	9,109	31,203	27,580
Operating Segments | Mobile Solutions | Brazil
Revenue, Major Customer [Line Items]
Net sales	7,100	9,414	17,815	27,432
Operating Segments | Mobile Solutions | Mexico
Revenue, Major Customer [Line Items]
Net sales	4,454	4,700	11,746	15,144
Operating Segments | Mobile Solutions | Germany
Revenue, Major Customer [Line Items]
Net sales	1,400	1,768	4,401	4,490
Operating Segments | Mobile Solutions | Poland
Revenue, Major Customer [Line Items]
Net sales	1,342	1,371	3,441	4,868
Operating Segments | Mobile Solutions | Other
Revenue, Major Customer [Line Items]
Net sales	6,174	6,562	18,204	21,960
Operating Segments | Power Solutions
Revenue, Major Customer [Line Items]
Net sales	43,415	47,430	127,307	148,480
Operating Segments | Power Solutions | United States and Puerto Rico
Revenue, Major Customer [Line Items]
Net sales	35,299	38,750	104,455	120,445
Operating Segments | Power Solutions | China
Revenue, Major Customer [Line Items]
Net sales	1,580	1,870	3,989	5,306
Operating Segments | Power Solutions | Brazil
Revenue, Major Customer [Line Items]
Net sales	253	72	446	221
Operating Segments | Power Solutions | Mexico
Revenue, Major Customer [Line Items]
Net sales	3,239	3,832	9,501	10,776
Operating Segments | Power Solutions | Germany
Revenue, Major Customer [Line Items]
Net sales	132	17	261	54
Operating Segments | Power Solutions | Poland
Revenue, Major Customer [Line Items]
Net sales	4	5	11	14
Operating Segments | Power Solutions | Other
Revenue, Major Customer [Line Items]
Net sales	2,908	2,884	8,644	11,664
Intersegment Sales Eliminations
Revenue, Major Customer [Line Items]
Net sales	(25)	(42)	(93)	(232)
Intersegment Sales Eliminations | United States and Puerto Rico
Revenue, Major Customer [Line Items]
Net sales	(25)	(42)	(93)	(232)
Intersegment Sales Eliminations | China
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Intersegment Sales Eliminations | Brazil
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Intersegment Sales Eliminations | Mexico
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Intersegment Sales Eliminations | Germany
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Intersegment Sales Eliminations | Poland
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Intersegment Sales Eliminations | Other
Revenue, Major Customer [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0