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Supplementary Cash Flow Information - Partial Cash Paid for Investing and Financing Activities (Parenthetical) (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Supplementary Cash Flow Information [line items]    
Other payables paid in 2018   $ 64,393
Unimos Shanghai [member]    
Disclosure Of Supplementary Cash Flow Information [line items]    
Other payables paid in 2018 $ 64,393