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Financial Risk Management And Fair Values Of Financial Instruments - Summary of Effect of Profit or Loss or of Other Comprehensive Income from Financial Assets Categorized (Detail) - Financial instruments at fair value through other comprehensive income [member] - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]    
Favorable Changes $ 6,866 $ 8,074
Unfavorable Changes In Fair Value 6,922 8,074
Enter prise value EBITDA multiple [member]    
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]    
Favorable Changes   3,443
Unfavorable Changes In Fair Value   3,443
Discount for lack of marketability [member]    
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]    
Favorable Changes 3,990 4,585
Unfavorable Changes In Fair Value 4,039 4,585
Foreign unlisted stocks [member] | Price to book ratio multiple [member]    
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]    
Favorable Changes   46
Unfavorable Changes In Fair Value   $ 46
Foreign unlisted stocks [member] | Enter prise value EBITDA multiple [member]    
Disclosure of significant unobservable inputs used in fair value measurement of equity [line items]    
Favorable Changes 2,876  
Unfavorable Changes In Fair Value $ 2,883