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Employee benefit expenses - Summary of Employee benefit expenses (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Classes of employee benefits expense [abstract]      
Salaries $ 5,302,234 $ 5,632,219 $ 4,937,591
Directors' remuneration 28,621 40,164 28,229
Labor and health insurance 449,223 424,901 396,796
Pension 205,671 200,014 189,489
Other personnel expenses 480,554 460,590 458,122
Total Employee benefit expenses $ 6,466,303 $ 6,757,888 $ 6,010,227