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Profit Before Income Tax - Summary of Employee Benefits Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Post-employment benefits        
Defined contribution plans $ 3,851,095 $ 117,447 $ 3,671,057 $ 3,590,439
Defined benefit plans 213,990 6,526 209,978 188,141
Post-employment benefits 4,065,085 123,973 3,881,035 3,778,580
Equity-settled share-based payments 2,188,600 66,746 742,890 989,843
Other employee benefits 93,677,548 2,856,894 86,893,030 98,404,937
Employee benefits expense 99,931,233 3,047,613 91,516,955 103,173,360
Operating costs [member]        
Post-employment benefits        
Employee benefits expense 61,843,852 1,886,058 58,390,785 65,063,705
Operating expenses [member]        
Post-employment benefits        
Employee benefits expense $ 38,087,381 $ 1,161,555 $ 33,126,170 $ 38,109,655