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Revenue by Geographic Area (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
 [1]
Revenues from External Customers and Long-Lived Assets [Line Items]      
NET SALES $ 539,521 $ 457,253 $ 530,348
Taiwan      
Revenues from External Customers and Long-Lived Assets [Line Items]      
NET SALES 95,023 77,117 70,984
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
NET SALES 42,099 63,432 53,476
Korea      
Revenues from External Customers and Long-Lived Assets [Line Items]      
NET SALES 24,261 52,885 135,845
China      
Revenues from External Customers and Long-Lived Assets [Line Items]      
NET SALES 154,789 123,261 142,948
Malaysia      
Revenues from External Customers and Long-Lived Assets [Line Items]      
NET SALES 46,319 50,663 49,444
Singapore      
Revenues from External Customers and Long-Lived Assets [Line Items]      
NET SALES 97,813 45,032 35,387
Others      
Revenues from External Customers and Long-Lived Assets [Line Items]      
NET SALES $ 79,217 $ 44,863 $ 42,264
[1] In 2019 and 2020, revenue billed to Japan was reclassified to others.