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Capital Surplus - Details of Capital Surplus (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Capital surplus [line items]    
Changes in associates accounted for using equity method $ 152 $ 4,834
Ending balance 6,055,773  
Capital surplus [member]    
Capital surplus [line items]    
Beginning balance 6,055,621 6,050,787
Changes in associates accounted for using equity method 152 4,834
Ending balance 6,055,773 6,055,621
Capital surplus [member] | Share premium [member]    
Capital surplus [line items]    
Beginning balance 6,043,483 6,043,483
Ending balance 6,043,483 6,043,483
Capital surplus [member] | Others [member]    
Capital surplus [line items]    
Beginning balance 12,138 7,304
Changes in associates accounted for using equity method 152 4,834
Ending balance $ 12,290 $ 12,138