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Income Tax - Summary of Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Current income tax        
In respect of the current year $ 6,807,882 $ 242,446 $ 5,002,954 $ 5,207,309
Income tax on unappropriated earnings 680,649 24,240 19,115 (1,022,560)
Changes in estimate for prior years (472,512) (16,827) (352,579) (103,822)
Current income tax 7,016,019 249,859 4,669,490 4,080,927
Deferred income tax        
In respect of the current year 212,338 7,562 563,512 (227,327)
Effect of tax rate changes     54,072 657,346
Changes in estimate for prior years (103,021) (3,669) (213,758) 5,696
Effect of foreign currency exchange differences (8,438) (301) (62,070) (3,273)
Deferred income tax 100,879 3,592 341,756 432,442
Income tax expense recognized in profit or loss $ 7,116,898 $ 253,451 $ 5,011,246 $ 4,513,369