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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 ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2022
USD ($)
Disclosure of defined benefit plans [line items]          
Percentage of monthly pension contributions 6.00% 6.00%      
Pension costs $ 188,141 $ 6,123 $ 214,599 $ 217,186  
Expected contribution to defined benefit plans     595,871    
Expected contribution to defined benefit plans in 2023 547,179 17,806      
Defined benefit obligation, pension payments     26,144    
Pension plans for executive managers [member]          
Disclosure of defined benefit plans [line items]          
Pension costs 7,735 252 32,836 11,184  
Accrued pension liabilities 381,512   369,999   $ 12,415
Gains (losses) on remeasurements of defined benefit plans $ (3,778) $ (123) $ (17,292) $ 279  
Bottom of range [member]          
Disclosure of defined benefit plans [line items]          
Average duration of the defined benefit obligation 6 years 6 years 9 years    
Top of range [member]          
Disclosure of defined benefit plans [line items]          
Average duration of the defined benefit obligation 13 years 13 years 16 years