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Property, Plant and Equipment, Net - Capitalization Interest and Capitalization Interest Rate Applied Related to Property, Plant and Equipment (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [abstract]      
Capitalization interest $ 9,762 $ 15,114 $ 18,542
Capitalization interest rate applied 1.4909% 1.7822% 1.7582%