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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, 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

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