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Operating Segments Information - Summary of Revenue from Major Products and Services (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of products and services [line items]        
Operating revenue $ 413,182,184 $ 13,814,182 $ 371,092,421 $ 290,441,208
Packaging service [member]        
Disclosure of products and services [line items]        
Operating revenue 198,916,897 6,650,515 178,308,222 126,225,119
Testing service [member]        
Disclosure of products and services [line items]        
Operating revenue 42,658,686 1,426,235 35,903,202 26,157,277
Electronic components manufacturing service [member]        
Disclosure of products and services [line items]        
Operating revenue 165,789,479 5,542,945 151,890,384 133,948,016
Other products and services [member]        
Disclosure of products and services [line items]        
Operating revenue $ 5,817,122 $ 194,487 $ 4,990,613 $ 4,110,796