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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, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Current income tax |  |  |  |
In respect of the current year | $ 9,812,221 | $ 299,244 | $ 10,117,252 | $ 16,251,844
Income tax on unappropriated earnings | 250,421 | 7,637 | (3,449,958) | 844,855
Changes in estimate for prior years | (453,274) | (13,823) | (67,074) | (211,631)
Current income tax | 9,609,368 | 293,058 | 6,600,220 | 16,885,068
Deferred income tax |  |  |  |
In respect of the current year | (1,568,365) | (47,831) | (1,352,999) | 185,726
Changes in tax rates | (25,229) | (769) | 2,763 | (4,425)
Changes in estimate for prior years | (60,902) | (1,857) | 35,465 | 2,481
Effect of foreign currency exchange differences | (38,409) | (1,172) | 18,514 | 76,684
Deferred income tax | (1,692,905) | (51,629) | (1,296,257) | 260,466
Income tax expense recognized in profit or loss | $ 7,916,463 | $ 241,429 | $ 5,303,963 | $ 17,145,534

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