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Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets at Fair Value Through Profit or Loss (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Financial Assets At Fair Value Through Profit Or Loss [line items]      
Current financial assets mandatorily measured at fair value through profit or loss $ 359,960 $ 12,976 $ 53,120
Non-current financial assets mandatorily measured at fair value through profit or loss 0   10,368
Foreign partnership interests [member]      
Financial Assets At Fair Value Through Profit Or Loss [line items]      
Non-current financial assets mandatorily measured at fair value through profit or loss 0   10,940
Listed stocks [member]      
Financial Assets At Fair Value Through Profit Or Loss [line items]      
Current financial assets mandatorily measured at fair value through profit or loss 339,679   46,512
Valuation adjustments [member]      
Financial Assets At Fair Value Through Profit Or Loss [line items]      
Current financial assets mandatorily measured at fair value through profit or loss 20,281   6,608
Non-current financial assets mandatorily measured at fair value through profit or loss $ 0   $ (572)