Business Segments, Geographic Data, Sales by Product Group and Major Customers - Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 20,902				$ 23,227				$ 20,902	$ 23,227
Net sales	132,326	$ 236,699	$ 105,781	$ 93,004	136,628	$ 262,413	$ 119,565	$ 94,505	567,810	613,111	$ 706,603
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	15,825				17,194				15,825	17,194
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	4,920				5,755				4,920	5,755
Net sales									439,979	479,133	544,096
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 157				$ 278				157	278
Net sales									1,952	1,064	2,012
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									69,647	71,094	92,811
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									21,923	21,882	26,947
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 34,309	$ 39,938	$ 40,737