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Segment Information - Revenue from External Customers Based on Customer's Country of Domicile and Long-lived Assets by Country of Domicile (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Geographical Areas [Line Items]      
Sales of goods / services $ 425,215 $ 384,565 $ 389,632
Total long-lived assets 44,294 41,533  
Thailand (Country of domicile) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Sales of goods / services 158,565 110,569 128,213
Total long-lived assets 28,140 25,011  
Singapore (Country of domicile) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Sales of goods / services 76,453 105,431 90,960
Total long-lived assets 6,831 6,821  
Australia (Country of domicile) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Sales of goods / services 34,901 27,918 36,731
Total long-lived assets 2,984 2,935  
The People's Republic of China (Country of domicile) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Sales of goods / services 108,561 96,956 93,718
Total long-lived assets 6,333 6,757  
Southeast Asia (Country of domicile) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Sales of goods / services 46,685 43,677 40,001
Northeast Asia (Country of domicile) [Member]      
Disclosure Of Geographical Areas [Line Items]      
Sales of goods / services 50 14 $ 9
Corporate [Member]      
Disclosure Of Geographical Areas [Line Items]      
Total long-lived assets $ 6 $ 9