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Non-current Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Non-current Financial Assets at Fair Value Through Other Comprehensive Income (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial assets at fair value through other comprehensive income [line items]    
Designation of equity instruments $ 262,007 $ 121,808
Foreign unlisted stocks [member]    
Financial assets at fair value through other comprehensive income [line items]    
Designation of equity instruments 38,534 38,534
Valuation adjustments [member]    
Financial assets at fair value through other comprehensive income [line items]    
Designation of equity instruments $ 223,473 $ 83,274