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Employee benefit expenses - Summary of Employee benefit expenses (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Classes of employee benefits expense [abstract]      
Salaries $ 4,741,380 $ 5,302,234 $ 5,632,219
Directors' remuneration 23,980 28,621 40,164
Labor and health insurance 432,568 449,223 424,901
Pension 195,359 205,671 200,014
Other personnel expenses 442,781 480,554 460,590
Total Employee benefit expenses $ 5,836,068 $ 6,466,303 $ 6,757,888