Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 22,956		$ 23,227
Net Sales	93,004	$ 94,505
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	17,229		17,194
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	5,504		5,755
Net Sales	71,373	69,560
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	223		$ 278
Net Sales	227	219
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	8,629	12,560
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	3,761	4,444
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 9,014	$ 7,722