Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 21,187		$ 21,187		$ 23,227
Net Sales	236,699	$ 262,413	435,484	$ 476,483
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	15,867		15,867		17,194
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	5,113		5,113		5,755
Net Sales	186,497	199,064	337,543	367,694
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	207		207		$ 278
Net Sales	1,182	397	1,709	784
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	25,606	33,640	49,542	56,537
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	11,091	11,062	18,663	18,086
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 12,323	$ 18,250	$ 28,027	$ 33,382