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Goodwill - Summary of Carrying Amounts of Goodwill Allocated to Cash-generating Units (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of information for cash-generating units [line items]            
Goodwill $ 50,198,436 $ 1,678,316 $ 49,974,446 $ 1,670,827 $ 9,934,494 $ 10,490,309
Packaging segment [member]            
Disclosure of information for cash-generating units [line items]            
Goodwill 35,717,828 1,194,177 35,729,371      
Testing segment [member]            
Disclosure of information for cash-generating units [line items]            
Goodwill 13,421,321 448,724 13,448,886      
All other segments [member]            
Disclosure of information for cash-generating units [line items]            
Goodwill $ 1,059,287 $ 35,415 $ 796,189