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Income Tax - Summary of Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Current income tax        
In respect of the current year $ 14,533,570 $ 523,921 $ 6,807,882 $ 5,002,954
Income tax on unappropriated earnings 3,684,138 132,810 680,649 19,115
Changes in estimate for prior years (129,152) (4,656) (472,512) (352,579)
Current income tax 18,088,556 652,075 7,016,019 4,669,490
Deferred income tax        
In respect of the current year (95,906) (3,457) 212,338 563,512
Changes in tax rates 18,337 660   54,072
Changes in estimate for prior years 16,625 600 (103,021) (213,758)
Effect of foreign currency exchange differences (83,840) (3,022) (8,438) (62,070)
Deferred income tax (144,784) (5,219) 100,879 341,756
Income tax expense recognized in profit or loss $ 17,943,772 $ 646,856 $ 7,116,898 $ 5,011,246