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Employee benefit expenses - Summary of Employee benefit expenses (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Classes of employee benefits expense [abstract]      
Salaries $ 5,632,219 $ 4,937,591 $ 5,114,790
Directors' remuneration 40,164 28,229 26,266
Labor and health insurance 424,901 396,796 422,106
Pension 200,014 189,489 194,173
Share-based payments     822
Other personnel expenses 460,590 458,122 317,616
Total Employee benefit expenses $ 6,757,888 $ 6,010,227 $ 6,075,773