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