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Income Tax - Summary of Major Components of Income Tax Expense (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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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

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