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Retirement Benefit Plans - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of defined benefit plans [line items]              
Percentage of monthly pension contributions     6.00% 6.00%      
Pension costs     $ 214,599 $ 7,736 $ 217,186 $ 277,041  
Expected contribution to defined benefit plans $ 595,871 $ 21,481 513,781        
Defined benefit obligation, pension payments     26,144 942      
Pension plans for executive managers [member]              
Disclosure of defined benefit plans [line items]              
Pension costs     32,836 $ 1,183 11,184 $ 11,567  
Accrued pension liabilities     $ 369,999   $ 346,015   $ 13,338
Bottom of range [member]              
Disclosure of defined benefit plans [line items]              
Average duration of the defined benefit obligation     9 years 9 years 9 years    
Top of range [member]              
Disclosure of defined benefit plans [line items]              
Average duration of the defined benefit obligation     16 years 16 years 16 years