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Income Tax - Summary of Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Current income tax        
In respect of the current year $ 16,251,844 $ 528,859 $ 14,533,570 $ 6,807,882
Income tax on unappropriated earnings 844,855 27,493 3,684,138 680,649
Changes in estimate for prior years (211,631) (6,887) (129,152) (472,512)
Current income tax 16,885,068 549,465 18,088,556 7,016,019
Deferred income tax        
In respect of the current year 185,726 6,044 (95,906) 212,338
Changes in tax rates (4,425) (144) 18,337  
Changes in estimate for prior years 2,481 81 16,625 (103,021)
Effect of foreign currency exchange differences 76,684 2,495 (83,840) (8,438)
Deferred income tax 260,466 8,476 (144,784) 100,879
Income tax expense recognized in profit or loss $ 17,145,534 $ 557,941 $ 17,943,772 $ 7,116,898