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Income Tax - Summary of Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Current income tax        
In respect of the current year $ 5,002,954 $ 167,267 $ 5,207,309 $ 4,979,766
Income tax on unappropriated earnings 19,115 639 (1,022,560) 1,076,353
Changes in estimate for prior years (352,579) (11,788) (103,822) (88,162)
Current income tax 4,669,490 156,118 4,080,927 5,967,957
Deferred income tax        
In respect of the current year 563,512 18,840 (227,327) 534,472
Effect of tax rate changes 54,072 1,808 657,346  
Changes in estimate for prior years (213,758) (7,147) 5,696 52,872
Effect of foreign currency exchange differences (62,070) (2,075) (3,273) (31,698)
Deferred income tax 341,756 11,426 432,442 555,646
Income tax expense recognized in profit or loss $ 5,011,246 $ 167,544 $ 4,513,369 $ 6,523,603