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Financial Assets at Fair Value Through Profit or Loss - Summary of Amounts recognized in Profit or Loss in Relation to Financial Assets at Fair Value Through Profit or Loss (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Financial Assets At Fair Value Through Profit Or Loss [line items]        
Financial assets mandatorily measured at fair value through profit or loss $ 24,015 $ 855 $ 1,317 $ 1,485
Foreign partnership interest [member]        
Financial Assets At Fair Value Through Profit Or Loss [line items]        
Financial assets mandatorily measured at fair value through profit or loss (670)   (433) 38
Beneficiary certificates [member]        
Financial Assets At Fair Value Through Profit Or Loss [line items]        
Financial assets mandatorily measured at fair value through profit or loss 18,077   $ 1,750 1,396
Derivative instrument [member]        
Financial Assets At Fair Value Through Profit Or Loss [line items]        
Financial assets mandatorily measured at fair value through profit or loss       $ 51
Listed stocks [member]        
Financial Assets At Fair Value Through Profit Or Loss [line items]        
Financial assets mandatorily measured at fair value through profit or loss $ 6,608