Business Segments, Geographic Data, and Sales by Major Customers - Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 16,925		$ 16,925		$ 20,902
Net sales	280,130	$ 236,699	446,138	$ 435,484
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	12,889		12,889		15,825
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	3,766		3,766		4,920
Net sales	229,975	186,497	369,942	337,543
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	270		270		$ 157
Net sales	616	1,182	1,808	1,709
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	25,740	25,606	39,477	49,542
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	10,218	11,091	14,960	18,663
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 13,581	$ 12,323	$ 19,951	$ 28,027